Green carborundum powder 40um for optical glass
Green carborundum powder 40um for optical glass is suitable for polishing hard materials such as optical glass, marbles, ceramics, and other hard-fragile combined materials. It is produced from an acid & water washing process. There is very little Ferro residue with high cleanness. Green silicon carbide is characterized by its high hardness and powerful grinding ability. Green carborundum powder is an aggressive polishing powder on optical glass. The strength can retain even in high temperatures up to 1400 degrees. The symbol of Green silicon carbide is GC.
Typical physical properties of Green carborundum powder 40um for optical glass
| Mohs Hardness: | 9.5 |
| Vickers Hardness: | 3100-3400kg/mm2 |
| Specific Gravity: | 3.2g/cm3 |
| Bulk density(LPD): | 1.2-1.6 g/cm3 |
| Color: | Green |
| Particle shape: | Hexagonal |
| Melting Point: | Dissociated at about 2600 centigrade |
| Maximum service temperature: | 1900 centigrade |
| Friability | Friable |
| Thermal conductivity | 0.013 cal/cm2.sec (900°C) |
| Thermal expansion coefficient | 7-9 x10-6 /℃(0-1600°C) |
Chemical analysis of Green carborundum powder 40um for optical glass
| Chemical Content | JIS240-JIS600 (63um-20um) | JIS700-JIS2000 (17um-7um) | JIS2500-JIS4000 (5um-3.5um) | JIS6000-JIS10000 (2.5um-1um) |
| SiC | ≥99.0% | ≥98.5% | ≥98.2% | ≥98.0% |
| SiO2 | ≤0.20% | ≤0.20% | ≤0.30% | ≤0.30% |
| F,Si | ≤0.20% | ≤0.20% | ≤0.20% | ≤0.50% |
| Fe2O3 | ≤0.40% | ≤0.40% | ≤0.50% | ≤0.80% |
| F.C | ≤0.1% | ≤0.1% | ≤0.3% | ≤0.3% |
Particle size distribution of Green carborundum powder 40um for optical glass
| D10(um): 23.633 | D50(um): 37.407 | D90(um): 59.941 | D97(um): 75.180 | D(3,2)(um): 35.089 | D(4,3)(um): 40.093 |
Product Feature of Green carborundum powder 40um for optical glass
- Extremely high hardness (Mohs 9.5, Vickers 3100-3400kg/mm2) with high wear-resistance ability.
- Excellent chemical resistance and oxidation resistance. When heated at high temperatures, silicon carbide only oxidizes on the surface, forming a silicon dioxide film. The film can protect the silicon carbide material from oxidation. As a result, even at 1600°C, green SiC can maintain stability to most strong acids and alkalis.
- High Toughness. The toughness of silicon carbide abrasive refers to the difficulty of breaking under the action of external force. Taking F46 grit as an example, the toughness of carborundum tested by static pressure method is about 68-78%. Compared with fused alumina, the mechanical strength of silicon carbide is higher. F120 for example, the compressive strength of silicon carbide is 186KN/cm2, and the compressive strength of corundum abrasive is 100KN/cm2.
- Excellent thermal shock resistance with low thermal expansion coefficient. At a temperature of 25-1400 °C, the average thermal expansion coefficient of silicon carbide is 4.4×10-6/°C, while the thermal expansion coefficient of fused alumina is 7-8×10-6/°C.
- High-temperature resistance; high-temperature strength. The melting point of green silicon carbide is 2600 °C, and the maximum operating temperature can reach 1900 °C. Applying silicon carbide to the inner wall of the engine can increase the life of the engine.
- High purity. The green silicon carbide grain from us is milling from A grade green SiC block. Then sieve to high consistency particles.
Applications of Green carborundum powder 40um for optical glass
- Polishing hard optical glass such as a camera lens.
- Polishing and grinding quartz glass.
- Lapping and polishing marbles, granite, jade, etc.
- Polishing PZT/ Piezoelectric ceramic.
- Polishing combined material hard and fragile such as Bakelite powder castings.
- Surface treatment on diamond tools such as PCD cutters.
- Polishing jewelry such as diamonds and cinnabar.
Specification of Green carborundum powder 40um for optical glass
JIS standard:
| JIS Grit Size | D0(Micron) | D3(Micron) | D50(Micron) | D94(Micron) |
| #240 | ≤ 127 | ≤ 103 | 57.0±3.0 | ≥ 40 |
| #280 | ≤ 112 | ≤ 87 | 48.0±3.0 | ≥ 33 |
| #320 | ≤ 98 | ≤ 74 | 40.0±2.5 | ≥ 27 |
| #360 | ≤ 86 | ≤ 66 | 35.0±2.0 | ≥ 23 |
| #400 | ≤ 75 | ≤ 58 | 30.0±2.0 | ≥ 20 |
| #500 | ≤ 63 | ≤ 50 | 25.0±2.0 | ≥ 16 |
| #600 | ≤ 53 | ≤ 41 | 20.0±1.5 | ≥ 13 |
| #700 | ≤ 45 | ≤ 37 | 17.0±1.5 | ≥ 11 |
| #800 | ≤ 38 | ≤ 31 | 14.0±1.0 | ≥ 9.0 |
| #1000 | ≤ 32 | ≤ 27 | 11.5.±1.0 | ≥ 7.0 |
| #1200 | ≤ 27 | ≤ 23 | 9.5±0.8 | ≥ 5.5 |
| #1500 | ≤ 23 | ≤ 20 | 8.0±0.6 | ≥ 4.5 |
| #2000 | ≤ 19 | ≤ 17 | 6.7±0.6 | ≥ 4.0 |
| #2500 | ≤ 16 | ≤ 14 | 5.5±0.5 | ≥ 3.0 |
| #3000 | ≤ 13 | ≤ 11 | 4.0±0.5 | ≥ 2.0 |
| #4000 | ≤ 11 | ≤ 8.0 | 3.0±0.4 | ≥ 1.8 |
| #6000 | ≤ 8.0 | ≤ 5.0 | 2.0±0.4 | ≥ 0.8 |
| #8000 | ≤ 6.0 | ≤ 3.5 | 1.2±0.3 | ≥ 0.6 |
FEPA standard:
| Grit Size | D3(um) | D50(um) | D94（um) |
| F230 | <82 | 53.0±3.0 | >34 |
| F240 | <70 | 44.5±2.0 | >28 |
| F280 | <59 | 36.5±1.5 | >22 |
| F320 | <49 | 29.2±1.5 | >16.5 |
| F360 | <40 | 22.8±1.5 | >12 |
| F400 | <32 | 17.3±1.0 | >8 |
| F500 | <25 | 12.8±1.0 | >5 |
| F600 | <19 | 9.3±1.0 | >3 |
| F800 | <14 | 6.5±1.0 | >2 |
| F1000 | <10 | 4.5±0.8 | >1 |
| F1200 | <7 | 3.0±0.5 | >1(at 80%) |
| F1500 | <5 | 2.0±0.4 | >0.8(at 80%) |
| F2000 | <3.5 | 1.2±0.3 | >0.5(at 80%) |
Production details of Green carborundum powder 40um for optical glass
Packing of Green carborundum powder 40um for optical glass
FAQ:
Q: What is the difference between green silicon carbide and black silicon carbide?
A: First of all, Green silicon carbide has a higher purity of SiC (99%), and black silicon carbide SiC purity is min 98%. Secondly, green silicon carbide is harder than black silicon carbide.
Q: What is the difference between FEPA, JIS standards of green silicon carbide powder?
A: Green silicon carbide powder FEPA standard is of Europe standard, it’s a Coulter method-based standard. Green silicon carbide powder JIS standard is of Japanese standard, it‘s a sedimentation method-based standard.
Q: Is the green silicon carbide powder from you by airflow sieving or water sieving?
A: Our green silicon carbide powder is made by the water-sieving process. So the particles are of high consistency.
Q: What are the HS code and CAS NO. of silicon carbide?
A: HS code is 2849200000. CAS NO. is 409-21-2.
Q: Is there any restriction to exporting green silicon carbide powder from China?
A: Yes, it has to get an export license to export. We will provide it to customers.
Q: How many kgs of free samples can we get?
A: We provide free samples of less than 1 kg. Clients have to bear the express cost and DGM certificate cost.
Q: How do you inspect products before delivery?
A: We will check items of chemical, density, particle size distribution and packing before delivery. After delivery, we keep samples of each batch for 3 months.
Q: Do you demand MOQ?
A: MOQ is 1 bag, always goes 25kgs. The transportation cost will be higher than that of 1MT.
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