Carborundum Powder: Practical Size Selection and Industrial Use Guide

Carborundum powder is a hard synthetic abrasive powder mainly made of silicon carbide. In industrial purchasing, the term “carborundum powder” is often used to describe silicon carbide powder, including black silicon carbide powder and green silicon carbide powder.

For buyers, the key question is usually not “What is carborundum powder?” but which type and particle size should be used for my material, process and surface finish requirement? Choosing the wrong powder may cause slow cutting, deep scratches, unstable polishing results or unnecessary cost.

This guide explains how carborundum powder is used in lapping, polishing, grinding, refractory and ceramic applications, and how buyers can select the right grade before requesting a quotation.

What Is Carborundum Powder?

Carborundum powder is a silicon carbide abrasive powder produced from silica sand and carbon materials through high-temperature electric furnace processing. After crushing, magnetic separation, screening and classification, it is supplied in different powder sizes.

Common names include:

• Carborundum powder

• Silicon carbide powder

• SiC powder

• Black silicon carbide powder

• Green silicon carbide powder

• Carborundum abrasive powder

Carborundum powder is valued for high hardness, sharp cutting ability, thermal stability and good wear resistance. It is harder than aluminum oxide abrasives and is commonly used for hard, brittle or wear-resistant materials.

Black vs Green Carborundum Powder

Carborundum powder is usually divided into black silicon carbide and green silicon carbide.

Black Carborundum Powder

Black silicon carbide powder is more cost-effective and has good toughness. It is commonly used in refractory materials, grinding tools, stone processing, floor treatment, coatings, brake materials and general industrial polishing.

It is suitable when the buyer needs stable cutting performance at a controlled cost.

Green Carborundum Powder

Green silicon carbide powder usually has higher purity and sharper cutting performance. It is often used for glass, ceramics, quartz, carbide tools, semiconductor-related materials and precision polishing.

It is suitable when the buyer needs cleaner processing, sharper cutting and more controlled surface finishing.

Common Applications of Carborundum Powder

1. Glass Lapping and Polishing

Carborundum powder is often used for glass edge processing, surface correction, rough polishing and lapping. Because silicon carbide is very hard and sharp, it can remove material efficiently.

If the glass surface shows deep scratches, the powder may be too coarse or the particle distribution may not be stable enough.

2. Ceramic Processing

Technical ceramics are hard and brittle, so they need an abrasive that can cut efficiently. Carborundum powder is used for ceramic lapping, grinding and surface finishing.

For alumina ceramics, zirconia ceramics and ceramic seals, buyers often care about particle size consistency. Unstable powder can cause uneven finish or surface defects.

3. Stone and Tile Grinding

Black carborundum powder is widely used in stone polishing, tile processing, terrazzo grinding and abrasive tools. It provides strong cutting ability for hard mineral surfaces.

For this application, buyers usually choose black silicon carbide because it offers good performance and better cost control.

4. Refractory Materials

Carborundum powder is also used in refractory castables, kiln materials, furnace linings and wear-resistant formulations. Silicon carbide offers high-temperature stability, wear resistance and good thermal conductivity.

For refractory use, buyers should confirm SiC content, particle size, impurity level and working temperature.

5. Abrasive Tools and Compounds

Carborundum powder can be used in grinding wheels, polishing compounds, lapping paste, abrasive slurry and coated products. The correct size depends on cutting speed, surface finish and the binder system.

Common Problems and Selection Tips

Problem 1: Polishing leaves scratches

Possible reasons:

• Powder is too coarse

• Particle size distribution is unstable

• Coarse particles are mixed into fine powder

• Pressure is too high

• Workpiece was not cleaned before polishing

Suggested solution:

Use finer carborundum powder and ask the supplier for particle size distribution control.

Problem 2: Cutting speed is too slow

Possible reasons:

• Powder is too fine

• Slurry concentration is too low

• Workpiece material is very hard

• Process pressure or speed is not suitable

Suggested solution:

Test a slightly coarser powder or switch from alumina powder to silicon carbide powder.

Problem 3: Surface finish is inconsistent

Possible reasons:

• Powder batches are not stable

• Slurry mixing is uneven

• Particle size classification is poor

• Reused slurry contains broken particles

Suggested solution:

Choose a supplier that can provide stable batch quality, COA and consistent powder classification.

What Buyers Should Confirm Before Ordering

To get the correct carborundum powder, buyers should provide more than just the product name.

Recommended RFQ information includes:

• Black or green carborundum powder

• Required particle size, such as mesh, FEPA, JIS, micron or D50

• Application: glass, ceramic, stone, refractory, lapping paste, etc.

• Wet or dry process

• Required SiC content

• Trial quantity or bulk quantity

• Packaging requirement

• Destination country

• Required documents, such as COA, TDS or SDS

Example RFQ:

“Green carborundum powder, JIS #2000, for ceramic lapping, wet slurry process, trial order 100 kg, packed in 25 kg bags, destination Germany.”

This type of request helps the supplier recommend the right grade and quote faster.

FAQ

Is carborundum powder the same as silicon carbide powder?

Yes. In many industrial markets, carborundum powder usually refers to silicon carbide powder or SiC abrasive powder.

What is carborundum powder used for?

It is used for lapping, polishing, grinding, refractory materials, ceramics, stone processing, abrasive tools and surface finishing.

Should I choose black or green carborundum powder?

Choose black silicon carbide powder for cost-effective grinding, refractory and general abrasive use. Choose green silicon carbide powder for higher purity and precision polishing.

Which particle size should I choose?

Use coarser powder for fast cutting and rough lapping. Use finer powder for polishing and precision surface finishing.

Why does carborundum powder scratch the surface?

Scratches may come from powder that is too coarse, unstable particle size distribution, high pressure or contamination in the polishing system.

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