Green Silicon Carbide Micro Powder, Infrared Opacifier for Nano Insulation Board 4000#/6000#,
Product Introduction
This product is high-purity GC green silicon carbide ultrafine micro powder, a dedicated infrared opacifier for nano-microporous insulation boards and silica aerogel insulation boards. Based on the Mie scattering effect, it efficiently scatters and absorbs mid-infrared thermal radiation in the range of 2.5–7 μm, remarkably suppressing radiant heat transfer at high temperatures and lowering the high-temperature thermal conductivity of materials. It solves the problem of deteriorated thermal insulation performance of traditional insulation materials under high temperature.
It is produced from highly crystalline green silicon carbide raw materials via ultrafine grinding, precise classification and pickling purification. We offer two mainstream grades: 4000# and 6000#.
Basic Physical & Chemical Parameters
Product Name: Green Silicon Carbide Micro Powder (GC Green SiC) Crystal Form: α-SiC hexagonal crystal Appearance: Light green ultrafine powder True Density: 3.20 g/cm³ Mohs Hardness: 9.4 Melting Point: 2250 ℃ Max Long-term Temperature Resistance: Stable against oxidation at 1200–1400 ℃ Refractive Index: 2.65~2.69, excellent infrared extinction performance
Special Specifications for Opacifier
| Item | 4000# | 6000# |
|---|---|---|
| SiC Purity, % | ≥98.5 | ≥98.5 |
| D50, μm | 3.0±0.4 | 2.0±0.3 |
| Free Carbon (F.C), % | ≤0.20 | ≤0.20 |
| Fe₂O₃, % | ≤0.30 | ≤0.30 |
| PH Value | 6.5–8.0 | 6.5–8.0 |
| Particle Size Distribution | Narrow range, strict control on coarse particles | Narrow range, ultrafine with low coarse content |
Selection Guide: 4000# has wide applicability and high cost performance; 6000# has finer particle size, suitable for low-density and ultra-thin nano insulation boards with more uniform light shielding effect.
Product Advantages
- High infrared opacifying efficiency: Matches the characteristic waveband of high-temperature thermal radiation, effectively blocking radiant heat transfer and greatly reducing high-temperature thermal conductivity.
- Stable performance at high temperature: Unlike carbon black, it has no mass loss under high heat, ensuring stable long-term service performance of insulation boards.
- Low impurities, no yellowing and no accelerated aging, suitable for formulas of high-end export-grade aerogel nano insulation boards.
- Good dispersibility: Surface modified for dispersion, evenly distributed in silicon-based systems with low settling and agglomeration tendency.
- Stable particle size and good batch consistency, convenient for formula locking and continuous mass production.
- Compatible with compound opacifier formulas with black silicon carbide, zirconia and titania; custom particle sizes available on request.
Main Applications
✅ Infrared opacifying filler for silica aerogel nano insulation boards ✅ Opacifier for microporous nano insulation boards and high-temperature refractory thermal insulation boards ✅ High-end thermal insulation composite materials for industrial kilns and pipeline insulation ✅ Additive for high-temperature insulation boards used in new energy, metallurgy and petrochemical equipment
