Green Silicon Carbide (G-SiC)
High-Purity Polishing, Semiconductor & Advanced Ceramics Material
Produced with NaCl catalyst for ultra-high crystal purity, green SiC is the material of choice where metallic contamination cannot be tolerated. From semiconductor wafer lapping (Ra <0.01 μm) to tungsten carbide tool grinding and PV wire-saw cutting — green SiC delivers the sharpness, purity, and friability that precision applications demand.
EU REACH
FerrumX Green Silicon Carbide — EU REACH Registered & Compliant
Certified for unrestricted import and sale in all 27 EU member states. SVHC screening confirms zero restricted substances.
CAS: 409-21-2
EC: 206-991-8
Tonnage: >10 tpa
SVHC (253 items): All N.D. (≤0.1% w/w)
Regulation: (EC) No 1907/2006
Physical & Thermal Properties
Typical Properties of Green Silicon Carbide
Green SiC combines extreme hardness, superior purity, chemical inertness, and excellent thermal conductivity — making it the preferred material for precision polishing, semiconductor processing, and high-purity industrial applications.
| Property | Value | Industrial Significance |
|---|---|---|
| Crystal Structure | α-SiC, hexagonal (monocrystalline, high-purity) | Sharper, more friable crystal morphology provides superior cutting ability and finer surface finish quality than black SiC |
| Mohs Hardness | 9.4–9.5 | Higher than black SiC (9.2) — enables efficient grinding of tungsten carbide and other ultra-hard materials |
| Knoop Hardness (100g) | 2,600 kg/mm² | 120 points higher than black SiC — superior micro-hardness for precision finishing and polishing applications |
| Density | 3.20–3.22 g/cm³ | High density allows effective penetration into hard workpiece surfaces during grinding and polishing |
| Bulk Density (macro grits) | 1.35–1.55 g/cm³ | Optimized packing density for bonded and coated abrasive formulations |
| Thermal Conductivity | 50–100 W/m·K | Superior heat dissipation prevents thermal damage during precision grinding and in thermal management applications |
| Coefficient of Thermal Expansion | 4.0–4.5 × 10⁻⁶ /K | Low CTE provides excellent thermal shock resistance — critical for semiconductor substrate processing |
| Max Service Temperature (Air) | 1,900 °C | Stable at extreme temperatures — suitable for high-temperature ceramics and kiln applications |
| Max Service Temperature (Inert) | 2,400 °C | Extremely stable in reducing atmospheres — suitable for furnace linings and crucibles |
| Decomposition Point | ~2,250 °C | High decomposition temperature ensures structural integrity under extreme heat |
| Chemical Inertness | Resistant to acids & alkalis; ultra-low metallic impurities | Minimal contamination risk — critical for semiconductor wafer processing where trace impurities degrade device performance |
| Particle Shape | Sharp, blocky, more friable than black SiC | Increased friability enables self-sharpening during polishing while maintaining aggressive cutting ability on hard substrates |
Product Range
Four Grades — From General Polishing to Semiconductor-Grade
Green SiC’s purity ladder climbs from 97% (general polishing) to 99.5% (semiconductor wafer lapping). Each step up unlocks more demanding applications — and commands a higher price point.
GC 99.5
Ultra-high purity for SiC wafer lapping, PV wire-saw slurry, and semiconductor substrate polishing. Fe₂O₃ ≤0.08% — semiconductor-safe metallic impurity levels.
GC 99
The workhorse of green SiC — tungsten carbide tool grinding, precision lapping, optics polishing. Higher hardness than WC (Mohs ~9) for efficient material removal.
GC 98
Structural ceramics, ceramic matrix composites, and high-performance coated abrasives for titanium alloys and hardened steels.
GC 97
Glass polishing, sandblasting media, and general-purpose surface finishing. Entry-level green SiC — higher purity than black SiC at competitive pricing.
Unique to Green SiC
The NaCl Catalyst Process — How Purity Is Engineered
Green SiC’s higher purity is not accidental — it’s engineered through sodium chloride catalysis and enhanced acid purification. This is what makes it fundamentally different from black SiC, not just a purer version of it.
Vapor-Phase Purification
Black SiC (85–90% grade) is charged into induction furnaces, ladle furnaces, and BOF converters as a combined deoxidizer and exothermic agent.
SiO₂ + 3C → SiC + 2CO↑ (with NaCl catalyst at 2,500°C)
NaCl is added to the silica sand and petroleum coke charge before Acheson furnace synthesis. As the furnace heats to 2,500°C, NaCl vaporizes at ~800°C — well before the SiC formation reaction begins. The sodium chloride vapor creates a purging atmosphere that carries away metallic impurities (Fe, Al, Ca, Mg) from the crystal growth zone through vapor-phase transport.
This is why green SiC crystals are not just purer — they’re structurally more perfect. Fewer lattice defects mean sharper edges, higher friability, and more consistent polishing performance.
Enhanced Acid Purification
Black SiC (85–90% grade) is charged into induction furnaces, ladle furnaces, and BOF converters as a combined deoxidizer and exothermic agent.
H₂SO₄ + HF leaching → Fe₂O₃ ≤0.08%
After crushing and classification, green SiC undergoes extended acid leaching with sulfuric acid (H₂SO₄) and hydrofluoric acid (HF) — a process not applied to standard black SiC grades. This removes residual silicon metal, silicon dioxide, and metallic contamination from crystal surfaces and grain boundaries.
For GC 99.5 semiconductor-grade batches, additional ICP-MS screening validates 15+ trace metallic elements (Fe, Al, Ca, Na, K, Cu, Ni, Cr, Zn, Ti, Mg, Mn, Pb, Sn, Ba) against semiconductor industry limits. Each batch ships with an enhanced COA including metallic trace analysis.
Polishing Performance
Surface Roughness by Grit Size — The Ra Roadmap
Green SiC’s friability enables continuous self-sharpening during polishing. Here’s what surface roughness (Ra) you can expect at each grit size — the engineer’s guide to selecting the right powder.
| Grit Size | D50 (μm) | Typical Ra (μm) | Finishing Stage | Workpiece Materials |
|---|---|---|---|---|
| F230 | ~30 | 0.8 – 1.2 | Rough lapping | Hardened steel, carbide blanks, ceramic substrates |
| F320 | ~18 | 0.4 – 0.6 | Medium lapping | Tool inserts, optical glass pre-polish, ceramic seals |
| F400 | ~12 | 0.2 – 0.4 | Medium polishing | WC tools, precision ceramics, sapphire substrates |
| F600 | ~8 | 0.1 – 0.2 | Fine polishing | Optical lenses, watch crystals, precision bearings |
| F800 | ~2 | 0.05 – 0.1 | Precision polishing | Silicon wafers, optical flats, gauge blocks |
| F1200 | ~1 | 0.01 – 0.05 | Ultra-precision polishing | SiC wafers, sapphire wafers, MEMS devices |
| F1500 | ~0.5 | <0.01 | Semiconductor mirror finish | Si/SiC wafer final polish, epitaxial substrate prep |
Approximate formula: Ra ≈ 0.025 × D50 (μm). Actual values depend on workpiece material, pressure, carrier fluid, and polishing machine parameters.
Grit Cross-Reference
International Particle Size Cross-Reference — FEPA / JIS / GB W / P-Grit
Green SiC is specified under multiple international standards. When sourcing globally, always confirm which standard is being referenced — the same grit number can mean different particle sizes across standards.
| Grit | FEPA F D50 (μm) | JIS D50 (μm) | GB W Nominal (μm) | P-grit D50 (μm) |
|---|---|---|---|---|
| 240 | 55.7±3.0 | 57.0±3.0 | W63 (63–50) | P240: 58.5±2.0 |
| 280 | 39.9±1.5 | 48.0±3.0 | — | P280: 52.2±2.0 |
| 320 | 32.8±1.5 | 40.0±2.5 | W40 (40–28) | P320: 46.2±1.5 |
| 360 | 26.7±1.5 | 35.0±2.0 | — | P360: 40.5±1.5 |
| 400 | 21.4±1.0 | 30.0±2.0 | W28 (28–20) | P400: 35.0±1.5 |
| 500 | 17.3±1.0 | 25.0±2.0 | W20 (20–14) | P500: 30.2±1.5 |
| 600 | 13.7±1.0 | 20.0±1.5 | W14 (14–10) | P600: 25.8±1.0 |
| 800 | 6.5±1.0 | 14.0±1.0 | — | P800: 21.8±1.0 |
| 1000 | 4.5±0.8 | 11.5±1.0 | — | P1000: 18.3±1.0 |
| 1200 | 3.1±0.5 | 9.5±0.8 | — | P1200: 15.3±1.0 |
| 1500 | — | 8.0±0.6 | — | P1500: 12.6±1.0 |
| 2000 | — | 6.7±0.6 | — | — |
| 3000 | — | 4.0±0.5 | — | — |
| 4000 | — | 3.0±0.4 | — | — |
| 6000 | — | 2.0±0.4 | — | — |
International procurement: specify the FEPA standard as the primary reference. Same grit number across different standards may correspond to different particle sizes — always confirm D50 values in your specification.
Application Deep Dives
Why Semiconductor & WC Industries Choose Green SiC
Two industries where green SiC is not just preferred — it’s essentially irreplaceable. Here’s the engineering reason why.
Semiconductor Wafer Processing
Begins at ~1,400°C. Gaseous SiO migrates inward through the charge, reacting with excess carbon to form SiC crystals in the next reaction.
Silicon, sapphire, and SiC wafers require surface roughness below 0.01 μm for lithography and epitaxial growth. Green SiC (GC 99.5, F800–F1500) is the lapping and polishing abrasive of choice because:
Tungsten Carbide Grinding
Tungsten carbide (WC) tool inserts are among the hardest industrial materials (Mohs ~9). Only abrasives harder than WC can grind it efficiently:
Green SiC grinding wheels (GC 99, F46–F220) achieve Ra 0.4–0.8 μm on WC inserts with 30–50% faster material removal rates than Al₂O₃ wheels. The self-sharpening behavior of green SiC’s friable crystals maintains consistent cutting performance throughout the grinding cycle.
Semiconductor Processing
SiC Wafer Processing Chain — From Slicing to CMP Mirror Polish
Semiconductor-grade SiC wafers require a 5-stage process from as-sliced to epi-ready finish. Green SiC micro powders are the lapping abrasive of choice throughout this chain.
Wire-Saw Slicing
Crystal boule is sliced into wafers using diamond wire or loose-abrasive wire-saw. This initial cutting leaves significant subsurface damage that must be removed in subsequent lapping steps.
Damage layer: 150–250μm
Wafer thickness: 350–500μm
Rough Lapping (F320–F400)
Removes the 150–250μm wire-saw damage layer produced during slicing. Green SiC slurry with an oil-based carrier delivers high material removal rates while minimizing new subsurface damage.
Removal rate: 3–10μm/min
Result Ra: ∼0.2μm
Fine Lapping (F600–F800)
Precision lapping with finer green SiC to correct wafer geometry and progressively reduce surface roughness in preparation for CMP stages.
Removal rate: 5–40μm/h
Result Ra: ∼0.1μm
TTV: 3–6μm
Single-Side Mechanical Polish (DMP)
First polishing stage using diamond or SiC abrasives suspended in an alkaline slurry on a rigid polishing pad. Removes fine lapping marks and produces a uniform matte surface.
Result Ra <0.05μm
CMP (Chemical Mechanical Polish)
Two-step CMP: rough CMP using KMnO4 + Al2O3 slurry (Ra <0.2nm), followed by fine CMP with SiO2 colloid + H2O2 (Ra <0.1nm). The wafer is now epi-ready with atomic-level flatness.
Rough CMP: Ra <0.2nm
Fine CMP: Ra <0.1nm
Polishing Method Comparison
Mechanical Polish
Diamond Abrasive
Two-stage mechanical polishing using diamond abrasives on a rigid metal or composite polishing plate. Coarse grinding removes lapping marks; fine grinding with sub-micron diamond achieves nano-level flatness.
Coarse Ra: 20nm | Fine Ra: 3nm | Subsurface damage: moderate
Chemical Mechanical Polish (CMP)
Chemical-Mechanical Synergy
Combined chemical and mechanical material removal. SiO2 colloidal silica slurry with KOH or H2O2 as the chemical activator. Chemical softening + abrasive removal = minimal subsurface damage.
Ra <0.3nm | Damage layer <5nm | Industry standard for epi-ready
Plasma-Assisted Polish (PAP)
Advanced: CF4/O2 Plasma + Mechanical
CF4/O2 plasma radical irradiation modifies the SiC surface into a softer reaction layer, which is then mechanically removed. Near-zero subsurface damage — next-generation technology under active research.
Subsurface damage ≈ 0 | Ra <0.2nm | Research-stage / emerging
Wire-Saw & PV
Photovoltaic Wafer Slicing — The 1,200-Tonne-per-GW Market
Global solar PV installations exceed 500 GW/year — each gigawatt requires approximately 1,000–1,200 tonnes of green SiC micro powder for wire-saw slurry. This is one of the largest volume applications for green SiC.
| Parameter | Specification | Why It Matters |
|---|---|---|
| Grade | GC 99 or GC 99.5 | Ultra-low metallic contamination prevents wafer doping impurities |
| Grit Size | F400–F600 (D50: 5–30 μm) | Matches wire diameter (80–120 μm) for optimal kerf loss |
| PSD Control | D50 ±1 μm (tighter than standard ±3–5 μm) | Uniform particle size ensures a consistent cutting rate and wafer thickness |
| Carrier Fluid | PEG (polyethylene glycol) or oil-based | Suspends SiC particles; provides cooling and lubrication |
| Solid Concentration | 50–65% by weight | Balance between cutting efficiency and slurry viscosity |
| Magnetic Particles | <5 ppm | Magnetic inclusions cause wire breakage and wafer defects |
| Consumption | ~1,000–1,200 t per GW of PV capacity | Slurry is typically recycled 3–5 times before disposal |
Grinding Wheels
Green SiC Grinding Wheel Specifications
Bond type selection is critical for green SiC grinding wheel performance. Choose vitrified bond for precision grinding, resin bond for shock absorption, or metal bond for high-speed production.
Vitrified (Ceramic)
Shape retention, heat resistant
Excellent shape retention and engineered porosity for optimal coolant flow. Heat-resistant vitrified bond is ideal for continuous production grinding of tungsten carbide tools and glass/ceramic components.
Resin
Elastic, shock-absorbing
Two-stage mechanical polishing using diamond abrasives on a rigid metal or composite polishing plate. Coarse grinding removes lapping marks; fine grinding with sub-micron diamond achieves nano-level flatness.
Metal
High strength, long life
Superior bond strength for high-speed production grinding of brittle materials. Longest wheel life but requires higher grinding pressure — ideal for automated production lines.
Workpiece Material & Grinding Parameters
| Material | Wheel Speed (m/s) | Feed (mm/pass) | Coolant | Ra Result |
|---|---|---|---|---|
| WC tools | 18–25 | 0.005–0.02 | Oil | 0.4–0.8 μm |
| Optical glass | 15–20 | 0.003–0.01 | Water | 0.1–0.4 μm |
| Industrial ceramics | 12–18 | 0.002–0.008 | Water | 0.2–0.5 μm |
| Sapphire/LED | 10–15 | 0.005–0.015 | Water | 0.05–0.2 μm |
Optics & LED
Optical Glass & Sapphire LED Substrate Polishing
Green SiC’s purity and sharp particle morphology deliver the low-defect, high-precision surface finishes required for optical components and LED substrates.
Optical Glass Polishing
Green SiC provides the precision edge over black SiC for optical applications. While black SiC is used for architectural glass rough grinding, green SiC is specified for precision optical lenses, prisms, and mirrors where surface quality is critical to optical performance.
For float glass edge grinding, green SiC wheels with vitrified bonds (120#–220#) remove stock at 15–20 m/s wheel speed with water coolant. Fine optical correction uses F400–F600 micro powders delivering Ra 0.1–0.4μm.
Sapphire LED Substrate Processing
Sapphire (Mohs 9) substrates for LED manufacturing require extremely high surface quality with minimal subsurface damage for quality epitaxial GaN layer growth. Green SiC is the abrasive of choice throughout the lapping and polishing chain.
The lapping stage uses F400–F800 green SiC for bulk stock removal. Pre-polish finishing uses F1200–F1500 to achieve Ra <0.05μm. Final CMP delivers an epi-ready mirror surface. TTV control within 1–2μm requires extremely uniform 1200# and 1500# slurry flow — suspended particle distribution must remain homogeneous throughout the process.
Technical Data
Chemical Composition & Grit Size Standards
Complete chemical specifications and FEPA/JIS grit size data for FerrumX green silicon carbide. All products are precision-graded and shipped with certificates of analysis (COA).
Chemical Composition — Processing Grades
| Grade | SiC (%) | F.C. (%) | Fe₂O₃ (%) | H₂O (%) | Primary Application |
|---|---|---|---|---|---|
| GC 99.5 | ≥99.50 | ≤0.05 | ≤0.08 | ≤0.10 | Semiconductor wafer lapping, PV wire-saw, SiC substrate polishing |
| GC 99 | ≥99.00 | ≤0.10 | ≤0.10 | ≤0.10 | Tungsten carbide grinding, precision lapping, optics polishing |
| GC 98 | ≥98.00 | ≤0.25 | ≤0.25 | ≤0.30 | Coated abrasives, structural ceramics, premium refractory |
| GC 97 | ≥97.00 | ≤0.30 | ≤0.40 | ≤0.30 | General polishing, glass finishing, sandblasting media |
Macro Grits: F8–F220 (FEPA Standard)
| Grit No. | Approx. Particle Size (µm) | Min. % SiC | Max. % C | Max. % SiO₂ | Max. % Si | Max. % Fe₂O₃ | Typical Bulk Density (g/cm³) | Typical Shape |
|---|---|---|---|---|---|---|---|---|
| F8 | 2000 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.35 – 1.43 | Blocky, sharp |
| F10 | 1700 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.35 – 1.44 | Blocky, sharp |
| F12 | 1400 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.41 – 1.49 | Blocky, sharp |
| F14 | 1180 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.42 – 1.50 | Blocky, sharp |
| F16 | 1000 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.43 – 1.51 | Blocky, sharp |
| F20 | 850 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.44 – 1.52 | Blocky, sharp |
| F22 | 710 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.44 – 1.52 | Blocky, sharp |
| F24 | 600 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.45 – 1.53 | Blocky, sharp |
| F30 | 500 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.45 – 1.53 | Blocky, sharp |
| F36 | 425 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.46 – 1.54 | Blocky, sharp |
| F40 | 355 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.47 – 1.55 | Blocky, sharp |
| F46 | 300 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.47 – 1.55 | Blocky, sharp |
| F54 | 250 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.46 – 1.54 | Blocky, sharp |
| F60 | 212 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.46 – 1.54 | Blocky, sharp |
| F70 | 180 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.45 – 1.53 | Blocky, sharp |
| F80 | 150 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.44 – 1.52 | Blocky, sharp |
| F90 | 125 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.43 – 1.51 | Blocky, sharp |
| F100 | 106 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.42 – 1.50 | Blocky, sharp |
| F120 | 90 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.40 – 1.48 | Blocky, sharp |
| F150 | 63 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.38 – 1.46 | Blocky, sharp |
| F180 | 53 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.38 – 1.46 | Blocky, sharp |
| F220 | 45 | 99.0 | 0.40 | 0.40 | 0.50 | 0.02 | 1.36 – 1.44 | Blocky, sharp |
Micro Grits: F230–F1500 (FEPA Standard)
| Grit No. | Approx. Particle Size (µm) | Min. % SiC | Max. % C | Max. % SiO₂ | Max. % Si | Max. % Fe₂O₃ | Typical Loose Pack Density (g/cm³) | Typical Shape |
|---|---|---|---|---|---|---|---|---|
| F230 | 28–32 | 98.6 | 0.40 | 0.20 | 0.20 | 0.08 | 1.27 ± 0.05 | Blocky, sharp |
| F240 | 25–30 | 98.6 | 0.40 | 0.20 | 0.20 | 0.08 | 1.25 ± 0.05 | Blocky, sharp |
| F280 | 22–25 | 98.6 | 0.40 | 0.20 | 0.20 | 0.08 | 1.22 ± 0.08 | Blocky, sharp |
| F320 | 16–20 | 98.6 | 0.40 | 0.20 | 0.20 | 0.08 | 1.17 ± 0.08 | Blocky, sharp |
| F360 | 12–15 | 98.6 | 0.40 | 0.10 | 0.20 | 0.08 | 1.13 ± 0.08 | Blocky, sharp |
| F400 | 8–12 | 99.6 | 0.20 | 0.20 | 0.10 | 0.08 | 1.01 ± 0.08 | Blocky, sharp |
| F500 | 5–8 | 99.6 | 0.20 | 0.20 | 0.10 | 0.08 | 0.95 ± 0.08 | Blocky, sharp |
| F600 | 3–5 | 99.6 | 0.20 | 0.20 | 0.10 | 0.08 | 0.88 ± 0.08 | Blocky, sharp |
| F800 | 2–3 | 99.6 | 0.20 | 0.20 | 0.10 | 0.08 | 0.81 ± 0.08 | Blocky, sharp |
| F1000 | 1–2 | 99.4 | 0.20 | 0.30 | 0.10 | 0.08 | NA | Blocky, sharp |
| F1200 | 0.7–1.5 | 99.4 | 0.20 | 0.30 | 0.10 | 0.08 | NA | Blocky, sharp |
| F1500 | 0.7 (submicron) | 99.4 | 0.20 | 0.30 | 0.10 | 0.08 | NA | Blocky, sharp |
Green vs Black SiC
Green Silicon Carbide vs. Black Silicon Carbide
Both green and black SiC are produced via carbothermal reduction in Acheson furnaces, but green SiC achieves higher purity and hardness through NaCl-catalyst synthesis and additional purification — making it superior for precision and high-purity applications.
Green Silicon Carbide
97–99.5% SiC · Mohs 9.4–9.5 · Knoop 2600
Black Silicon Carbide
75–99% SiC · Mohs 9.2 · Knoop 2480
Quick Comparison Matrix
| Property | Black SiC | Green SiC | Winner |
|---|---|---|---|
| SiC Purity | 75–99% | 97–99.5% | Green (higher) |
| Mohs Hardness | 9.2 | 9.4–9.5 | Green (+0.2–0.3) |
| Knoop Hardness | 2480 | 2600 | Green (+120) |
| Cost per Ton | Baseline | 2–5× higher | Black (economical) |
| Production Volume | ~70% of SiC market | ~30% of SiC market | Black (majority) |
| Refractory Use | Standard — 90–98% grades | Premium — limited use | Black (cost-effective) |
| Metallurgical Use | Primary — 85–90% grades | Rarely used | Black (standard) |
| Precision Polishing | Suitable for general use | Superior — semiconductor grade | Green (precision) |
| Wire-Saw Cutting | Standard PV wafer cutting | Premium wafer cutting | Both (application-dependent) |
Manufacturing
Green Silicon Carbide Production Process
From raw material selection with NaCl catalyst addition to enhanced acid purification — FerrumX’s six-stage production process ensures the ultra-high purity and consistent particle-size distribution that green SiC applications demand.
STEP 01
Raw Material Selection & NaCatalyst
High-purity silica sand (SiO₂ ≥99%), petroleum coke (fixed C ≥95%), and sodium chloride (NaCl) are sourced, tested, and blended at optimized ratios. NaCl acts as a catalyst and impurity scavenger during synthesis, promoting higher SiC crystal purity and the characteristic green coloration.
STEP 02
Acheson Furnace Synthesis
The blended charge is loaded into an Acheson resistance furnace and heated to 2,500°C. The reaction SiO₂ + 3C → SiC + 2CO↑ occurs over 36–48 hours, forming large α-SiC crystals in the furnace core zone.
STEP 03
Cooling & Sorting
fter controlled cooling (5–7 days), the solid SiC block is extracted. Core-zone green crystals (highest purity, 97–99.5% SiC) are separated from outer-zone material. The characteristic green, semi-translucent appearance identifies high-purity zones.
STEP 04
Crushing & Classification
SiC blocks are crushed through multi-stage jaw and roller crushers, then classified via vibrating screens and air classifiers into FEPA F-series grit sizes — from macro grains (F8–F220) to micro powders (F230–F1500). Precision classification ensures tight PSD tolerances for polishing applications.
STEP 05
Enhanced Acid Purification
For semiconductor-grade green SiC, extended acid leaching with H₂SO₄/HF removes residual Si, SiO₂, and metallic impurities. This enhanced purification reduces Fe₂O₃ to ≤0.08% and total metallic contamination to semiconductor-safe levels — a critical step not applied to standard black SiC grades.
STEP 06
QC & Packaging
Each batch undergoes ICP chemical analysis (SiC%, F.C.%, Fe₂O₃%, metallic trace elements), laser particle-size analysis (PSD), and bulk density testing. Products are packaged in 25kg bags, 1-ton bulk bags, or custom packaging with full COA documentation. Semiconductor-grade batches receive additional impurity screening.
Key Advantages
Why Choose FerrumX Green Silicon Carbide
From superior hardness and purity to enhanced acid purification and semiconductor-grade quality control — discover what makes FerrumX green SiC the preferred choice for precision and high-purity applications.
Green SiC’s higher Mohs hardness (9.4–9.5) and sharper, more friable crystal morphology provide aggressive cutting on ultra-hard substrates like tungsten carbide (Mohs ~9) — with continuous self-sharpening that maintains consistent material removal rates throughout the polishing cycle.
Green SiC achieves 97–99.5% SiC purity through NaCl-catalyst synthesis and enhanced acid purification. Metallic impurity levels (Fe₂O₃ ≤0.08%) meet semiconductor-grade specifications — minimizing contamination risk during wafer lapping and polishing where even trace metals degrade device performance.
From macro grits (F8–F220) for grinding wheels to micro powders (F230–F1500) for precision polishing. All products are graded per FEPA, JIS (#240–#3000), or ANSI (6×10–80×180) standards with a COA per shipment.
Two 40,000 KVA smelting furnaces with five deep-processing lines guarantee a stable, scalable supply. Custom PSD, Ready-To-Press (RTP) granules, sintering additives, and OEM packaging available on request.
Dual-Certified Quality Management
FerrumX holds ISO 9001 (Quality Management) and ISO 45001 (Occupational Health & Safety) certifications. Every batch is traceable by batch number with full ICP and laser PSD analysis documentation.
Global Export & Logistics
Exporting to 50+ countries across Asia, Europe, the Americas, and the Middle East. Flexible packaging (25kg bags, 1-ton bulk bags, pallets), multimodal logistics, and customs documentation support for seamless international delivery.
Applications
Applications of Green Silicon Carbide
Green SiC serves as a critical high-purity material across eight major precision industries — from semiconductor wafer processing and tungsten carbide grinding to advanced ceramics and optical polishing.
Wafer Lapping & Polishing
Green SiC micro powders (F500–F1500) achieve sub-micron surface roughness on silicon, sapphire, and SiC wafers — meeting semiconductor industry Ra <0.01 μm specifications. Ultra-low metallic impurity levels minimize contamination risk during critical wafer processing stages.
Recommended: GC 99.5 · F500–F1500 → SiC Powder →
Tungsten Carbide Grinding
Green SiC is the preferred abrasive for grinding tungsten carbide (WC) tool inserts — its higher hardness (Mohs 9.4–9.5) exceeds WC hardness (~Mohs 9), enabling 30–50% faster material removal rates and superior surface finish compared to aluminum oxide abrasives.
Recommended: GC 99 · F46–F220 → SiC Abrasives →
Precision Polishing & Lapping
Optical lenses, glass substrates, precision ceramics, and hard alloy components. Green SiC’s sharper, more friable crystals achieve mirror-quality surface finishes with fewer subsurface defects — ideal for optics, watch crystals, and precision engineering components.
Recommended: GC 98–99 · F230–F800
Advanced Ceramics
Structural ceramics, functional ceramics, ceramic matrix composites (CMC), and sintered SiC components. Green SiC’s high purity ensures minimal impurity-induced defects in advanced ceramic formulations, improving mechanical strength and thermal performance.
Recommended: GC 98–99 · F230–F1200 → SiC Powder →
Wire-Saw & PV Wafer Slicing
Green SiC slurry for wire-saw cutting of silicon ingots, sapphire substrates, and SiC crystal wafers in solar PV and semiconductor manufacturing. High-purity green SiC minimizes metallic contamination during wafer slicing — critical for device performance.
Recommended: GC 99–99.5 · F230–F500 → SiC Powder →
High-Purity Composite Reinforcement
Reinforcement in metal matrix composites (MMC) and polymer composites where high purity is required — aerospace components, electronics packaging, and thermal management substrates. Green SiC particles provide superior mechanical properties with minimal impurity interactions.
Recommended: GC 98–99 · F220–F500
Premium Refractory Additives
Specialized refractory applications requiring high-purity SiC — high-performance kiln furniture, advanced ceramic kiln supports, and premium refractory coatings. Green SiC’s superior thermal conductivity and purity enhance refractory performance in demanding environments.
Recommended: GC 97–98 · 0–5mm → SiC for Refractories →
Coated & Bonded Abrasive Tools
High-performance sandpaper, abrasive belts, polishing discs, and bonded grinding wheels for hard material finishing. Green SiC-coated abrasives achieve superior surface quality on titanium alloys, stainless steel, glass, and hardened steels.
Recommended: GC 97–99 · F12–F220 → SiC Abrasives →
Market Insights
Green SiC Market — $4.23B and Growing at 16.2% CAGR
Comprehensive market data from GEP Research (2026). The global green SiC market is projected to more than double in five years, driven by semiconductor expansion, solar PV, and electric vehicle manufacturing.
Market Share by Application (2025)
68.4Mt
China Output
31.5%
China Export
∼12Mt
Hi-Purity Gap
Regional Growth & Trends
North America — 14.9% CAGR
Driven by high-end micro powder demand for semiconductor wafer processing and precision optics. CHIPS Act investment accelerates domestic SiC substrate manufacturing.
Europe — 13.1% CAGR
REACH compliance requirements drive demand for certified green SiC. Automotive (EV) and renewable energy sectors are primary growth engines for European green SiC imports.
Semiconductor Share: 18.3% → 26.5% by 2030
SiC power device manufacturing (MOSFETs, Schottky diodes for EVs and renewable energy inverters) is the single largest growth catalyst driving green SiC demand toward 2030.
Key Growth Drivers
SiC power device expansion
SiC MOSFETs and Schottky diodes are replacing silicon devices in EVs, renewable energy inverters, and industrial power systems — driving 8.5% CAGR demand for green SiC wafer polishing consumables.
Solar PV at 500+ GW/year
Global PV installations exceed 500 GW annually, each GW requiring approximately 1,200 tonnes of green SiC wire-saw slurry — a 600,000+ tonne/year market for GC 99 micro powder alone.
EU REACH compliance advantage
New EU REACH requirements (effective June 2026) for SiC micropowder in finished products create a compliance barrier — REACH-certified suppliers like FerrumX gain market share from non-compliant competitors.
Precision engineering demands
Aerospace, medical devices, and optics industries require Ra <0.01 μm surface finishes — driving demand for green SiC micro powders F800–F1500 for lapping and polishing applications.
Advanced ceramics & EV thermal management
SiC ceramics are increasingly used in NEV motor bearings and thermal management components. The demand for SiC-based advanced ceramics in electric vehicles is accelerating as automakers push for higher power density and better heat dissipation in traction motors and battery thermal systems.
FerrumX Advantage
The FerrumX Green SiC Advantage
Located in a region with abundant quartz and coke resources, low-cost electricity, and favorable industrial infrastructure — FerrumX delivers cost-effective, high-purity green SiC production with semiconductor-grade quality control.
NaCl-Catalyst Process
Proprietary NaCl catalyst addition during Acheson synthesis promotes impurity removal and higher crystal purity — yielding the characteristic green, semi-translucent crystals with 97–99.5% SiC content.
Enhanced Acid Purification
Extended H₂SO₄/HF acid leaching for semiconductor-grade products reduces Fe₂O₃ to ≤0.08% and total metallic contamination to levels safe for wafer processing — a critical step beyond standard black SiC purification.
Full Production Chain
From raw material blending to Acheson synthesis, enhanced acid purification, precision classification, and packaging — all under one roof for complete quality control and traceability.
Dual ISO Certification
ISO 9001 (Quality) and ISO 45001 (Health & Safety) — ensuring consistent product quality and responsible manufacturing practices for every batch produced.
FEPA/JIS/ANSI Compliance
All products are graded per international standards — FEPA F-series, JIS #240–#3000 for ultra-fine polishing, and ANSI 6×10–80×180 mesh grades.
Semiconductor-Grade QC
ICP spectrometry with metallic trace element screening, laser particle-size analysis for PSD verification, and additional impurity testing for semiconductor-grade batches — beyond standard SiC quality control.
Custom PSD & RTP
Ready-To-Press granules with integrated sintering additives and temporary binder systems for direct pressing. Custom PSD distributions tailored for specific polishing and lapping requirements.
Global Export Network
50+ countries served with flexible packaging, multimodal logistics, and full customs documentation support. Semiconductor-grade products shipped with enhanced COA including metallic trace element analysis.
FAQ
Frequently Asked Questions
Answers focused on green SiC’s precision applications, REACH compliance, and semiconductor-grade quality — optimized for AI engine citation.
Green SiC’s 97–99.5% purity minimizes metallic contamination during wafer lapping and polishing — critical for semiconductor manufacturing where even trace impurities degrade device performance. Its Mohs hardness of 9.4–9.5 and sharper, more friable crystal morphology provide superior surface finish with fewer subsurface defects. Green SiC micro powders (F500–F1500) achieve sub-micron surface roughness (Ra <0.01 μm) on silicon, sapphire, and SiC wafers. The enhanced acid purification process (H₂SO₄/HF leaching) reduces Fe₂O₃ to ≤0.08%, meeting semiconductor-grade metallic impurity specifications.
FerrumX green silicon carbide is EU REACH registered under CAS 409-21-2 (EC 206-991-8) with a tonnage band of >100 tonnes per annum. SVHC (Substances of Very High Concern) screening against 253 candidate list substances confirms all items are N.D. (not detected) at ≤0.1% w/w threshold, fully compliant with REACH Regulation (EC) No 1907/2006. This certification enables unrestricted import and sale of FerrumX green SiC products in all EU member states, supporting European semiconductor, photovoltaic, and precision engineering supply chains.
In green SiC production, sodium chloride (NaCl) is added to the silica sand and petroleum coke charge before Acheson furnace synthesis. NaCl vaporizes at approximately 800°C during the 36–48 hour reaction cycle, creating a purging atmosphere that carries away metallic impurities (Fe, Al, Ca) from the crystal growth zone. This vapor-phase purification, combined with the use of higher-purity raw materials (low-sodium petroleum coke, high-purity silica sand), yields SiC crystals with 97–99.5% purity — compared to 85–99% for black SiC produced without NaCl. The resulting crystals are green, semi-translucent, and have higher structural perfection.
FerrumX green SiC is available in macro grits F8–F220 (particle size 45–3500 μm) and micro grits F230–F1500 (particle size 0.7–55 μm), graded per FEPA standards. JIS standard sizes range from #24Green SiC (Mohs 9.4–9.5, Knoop 2600) is harder than tungsten carbide (WC, Mohs ~9), enabling efficient material removal. Its sharper, more friable crystal edges maintain cutting ability throughout the grinding cycle — each fractured edge exposes a new sharp surface. Green SiC grinding wheels for carbide tools achieve surface roughness Ra 0.4–0.8 μm with 30–50% faster material removal rates compared to aluminum oxide abrasives, reducing tool regrinding time and cost. Black SiC (Mohs 9.2) can also grind WC but with lower efficiency and shorter wheel life.0 to #3000 for ultra-fine polishing applications, and ANSI mesh grades from 6×10 to 80×180. Bulk densities range from 1.35–1.55 g/cm³ for macro grits and 0.81–1.27 g/cm³ for micro grits. Custom particle size distributions and blended grades are available on request.
Green SiC’s high purity (97–99.5%) minimizes metallic contamination during wafer lapping and polishing — critical for semiconductor manufacturing where even trace impurities can degrade devicFor photovoltaic silicon wafer wire-saw cutting, green SiC slurry typically uses GC 99 or GC 99.5 grade at F400–F600 grit (particle size 5–30 μm). The slurry consists of green SiC micro powder suspended in polyethylene glycol (PEG) or oil-based carrier fluid at 50–65% solid concentration by weight. Each gigawatt of PV capacity requires approximately 1,000–1,200 tonnes of green SiC micro powder. Key quality parameters include tight PSD (D50 control ±1 μm), low magnetic particle content (<5 ppm), and minimal metallic contamination (Fe₂O₃ ≤0.08%) to prevent wafer contamination.e performance. Its higher Mohs hardness (9.4–9.5) and sharper, more friable crystal morphology provide superior surface finish quality with fewer subsurface defects. Green SiC micro powders (F500–F1500) achieve sub-micron surface roughness on silicon, sapphire, and SiC wafers — meeting semiconductor industry Ra <0.01 μm specifications.
Green SiC is the preferred abrasive for grinding tungsten carbide (WC) tool inserts because its higher hardness (Mohs 9.4–9.5, Knoop 2600) exceeds WC hardness (Mohs ~9), enabling efficient material removal. Its sharper, more friable crystal edges maintain cutGreen SiC polishing performance by grit size: F230 (D50 ~30 μm) achieves Ra ~0.8–1.2 μm (rough lapping); F400 (D50 ~12 μm) achieves Ra ~0.2–0.4 μm (medium polishing); F800 (D50 ~2 μm) achieves Ra ~0.05–0.1 μm (fine polishing); F1200 (D50 ~1 μm) achieves Ra ~0.01–0.05 μm (precision polishing); F1500 (D50 ~0.5 μm) achieves Ra <0.01 μm (semiconductor-grade mirror finish). The approximate formula is Ra ≈ 0.025 × D50 (in μm). Actual results depend on workpiece material, polishing pressure, and carrier fluid.ting ability throughout the grinding cycle. Green SiC grinding wheels for carbide tools achieve surface roughness Ra 0.4–0.8 μm with 30–50% faster material removal rates compared to aluminum oxide abrasives, reducing tool regrinding time and cost.
FerrumX operates two 40,000 KVA Acheson smelting furnaces with an annual production capacity of 120,000 tonnes of SiC products. Five deep-processing lines handle crushing, milling, and classification. Quality control includes ICP chemical analysis for SiC%, F.C.%, and Fe₂O₃%, laser particle-size analysis for PSD verifiGreen SiC undergoes more rigorous quality control than black SiC due to its semiconductor and precision applications: (1) Extended acid leaching with H₂SO₄/HF reduces Fe₂O₃ to ≤0.08% (vs ≤0.10–3.00% for black SiC); (2) Additional ICP-MS screening for 15+ metallic trace elements (Fe, Al, Ca, Na, K, Cu, Ni, Cr, Zn, Ti, Mg, Mn, Pb, Sn, Ba); (3) Magnetic particle content testing (<5 ppm for semiconductor-grade); (4) Tighter PSD tolerances (D50 ±1 μm for micro powders vs ±3–5 μm for standard grades). All semiconductor-grade batches receive enhanced COA with metallic trace element analysis.cation, and bulk density measurement per batch. All products are traceable by batch number, and certificates of analysis (COA) are provided with each shipment. FerrumX is ISO 9001 and ISO 45001 certified.
The global green silicon carbide market was valued at approximately USD 580 million in 2024 and is projected to reach USD 1.02 billion by 2032, growing at a CAGR of 7.4%. The semiconductor and electronics segment is the fastest-growing application at 8.5% CThe global green silicon carbide market was valued at approximately USD 580 million in 2024 and is projected to reach USD 1.02 billion by 2032, growing at a CAGR of 7.4%. The semiconductor and electronics segment is the fastest-growing application at 8.5% CAGR, driven by SiC power device manufacturing (MOSFETs, Schottky diodes) for EVs and renewable energy. Solar PV expansion drives wire-saw slurry demand — each GW of solar capacity requires ~1,200 tonnes of green SiC. Asia-Pacific holds 48% market share with China as the largest producer. Green SiC commands 2–5× higher pricing than black SiC, reflecting its premium purity.AGR, driven by expanding SiC power device manufacturing and solar PV wafer production. Asia-Pacific dominates with a 48% market share, with China as the largest producer. Green SiC commands 2–5× higher pricing than black SiC, reflecting its premium purity and specialized applications.
