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Washington Mills AS manufactures high quality silicon carbide micro grit powders and sub-micron powders, and is one of the largest producers of silicon carbide micro grits and powders in the world. We can produce the quantity you need to the specifications that you require. Washington Mills AS is exclusively focused on manufacturing silicon carbide micro grits and powders and our years of experience show in our technical expertise and the high quality of our products. We are known in the industry for our expertise in producing large quantities of silicon carbide powders made to precise specifications while mantaining a superior level of product quality. We partner with our customers and are dedicated to using our technical milling expertise and silicon carbide know-how in order to make the best products for our customers. The information below represents typical technical data, but please contact us to find out more about our specific products to suit your particular application.
CARBOREX micro grits have a wide range of applications from lapping, polishing, technical ceramics to wire sawing silicon wafers and more. CARBOREX micro grits are manufactured and graded using the most sophisticated processes in order to ensure quality and consistency. A strict quality standard is adhered to at every point of production, and our quality program certified with ISO 9001:2008 ensures predictable and consistent results. The letter "F" signifies that CARBOREX is manufactured to the internationally accepted FEPA standard for bonded abrasives and general use. We produce micro grits in a number of sizes. Standard information on particle size and chemistry is provided below, but please contact us for more details on variations to this general information.
Data sheet no. 3 - Carborex Silicon Carbide BW microgrits
| Grit designation |
ds3 value max.µm |
Median grain size ds50 value µm |
ds94 value min.µm |
| F 240 | 70 | 44.5±2.0 | 28 |
| F 280 | 59 | 36.5±1.5 | 22 |
| F 320 | 49 | 29.2±1.5 | 16.5 |
| F 360 | 40 | 22.8±1.5 | 12 |
| F 400 | 32 | 17.3±1.0 | 8 |
| F 500 | 25 | 12.8±1.0 | 5 |
| F 600 | 19 | 9.3±1.0 | 3 |
| F 800 | 14 | 6.5±1.0 | 2 |
| F 1000 | 10 | 4.5±0.8 | 1 |
| F 1200 | 7 | 3.0±0.5 | 1(at 80%) |
| F 1500 | 5 | 2.0±0.4 | 0.8(at 80%) |
| Product | % SiC | % Free C | % Si | % Si0² | % Fe |
| F 240 - F 600 | 99.0 | 0.15 | 0.25 | 0.40 | 0.07 |
| F 800 - F 1500 | 98.3 | 0.25 | 0.35 | 0.60 | 0.10 |
Washington Mills AS is one of the world's leading producers of silicon carbide micro grits for wire sawing in the semiconductor and photovoltaic industry. Silicon wafer producers trust CARBOREX to slice silicon wafers efficiently with minimal kerf loss. Our high quality F 500 PV, F 600 PV and F 800 PV CARBOREX micro grits are specially manufactured to a specific grain shape which makes them very efficient in the wire sawing of silicon wafers. The grits are carefully classified with our unique process technology to meet the particle size distribution required for efficient wire sawing. In addition to chemical analyses and particle size, these grits are carefully manufactured according to strict specifications for their circularity and abrasive efficiency which are critical parameters for these applications. The following data can be considered as guidelines but should not be used as specification. We can manufacture grits according to different specifications - please contact us for more details.
Data sheet no. 2 - Carborex Silicon Carbide for wiresawing usage
| Grit designation | ds3 value max.µm |
Median grain size ds50 value µm |
ds94 value min.µm |
| F 500 PV | 20.0 | 12.8±1.0 | 9.0 |
| F 600 PV | 15.0 | 9.3±1.0 | 5.0 |
| F 800 PV | 11.5 | 6.5±1.0 | 3.0 |
| Product | % SiC | % Free C | % Si | % Si0² | % Fe |
| BW F 500/F 600 | 99.2 | 0.15 | 0.25 | 0.40 | 0.07 |
| BW F 800 | 98.3 | 0.25 | 0.35 | 0.60 | 0.10 |
A fine powder that is well suited for ceramic applications. The following data can be considered a guideline but should not be used a specification. We can manufacture grits according to different specifications - please contact us for more details.
Data sheet no. 5 - Carborex Silicon Carbide FP 4
| Grit designation |
ds10 value max.µm |
Median grain size ds50 value µm |
ds90 value min.µm |
| FP 4 | 10.0 | 3.0 | 1.0 |
| Product | % SiC | % Free C | % Si0² | % Fe tot. |
| CARBOREX FP 4 | 97.0 | 0.3 | 1.5 | 0.15 |
A very fine product that can be used in many different applications.
Data sheet no. 6 - Carborex Silicon Carbide 1000/F
| Grit designation | ds10 value max.µm |
Median grain size ds50 value µm |
ds90 value min.µm |
| 800/F | 12.0 | 7.0 | 3.0 |
| Product | % SiC | % Free C | % Si02 | % Fe tot. |
| CARBOREX 800/F | 98.5 | 0.4 | 0.7 | 0.10 |
A versatile product that can be used for many different applications and is well suited for use in refractory applications. Typical silicon carbide content is 94%. The content of fines minus 325 mesh (45µm) can vary between 60 and 85% and the color from black to grey.
Data sheet no. 7 - Carborex Silicon Carbide for Refractory and Ceramic Applications
| ASTM sieve | 50 | 120 | 140 | 170 | 230 | 325 | -325 |
| Percent | trace | 1 | 2 | 2 | 5 | 15 | 75 |
| Product | % SiC | % Free C | % Si | % Si02 | % Fe tot. |
| DCF | 94.0 | 1.0 | 1.5 | 2.0 | 0.2 |