Choosing the right silicon carbide grit size is important for achieving the desired surface finish, cutting performance, and material removal rate. Whether you are purchasing silicon carbide for sandblasting, grinding, lapping, polishing, or precision applications, the grit size can significantly affect the final result.

Silicon carbide is available in a wide range of grit sizes, from coarse abrasive grains to very fine powders. Understanding what these grit numbers mean and how to select the right size can help buyers avoid choosing a product that is either too aggressive or too fine for their application.

In this guide, we explain silicon carbide grit sizes, common mesh sizes, and how to choose the right SiC grit for different applications.

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What Is Silicon Carbide Grit?

Silicon carbide grit refers to crushed and classified silicon carbide abrasive particles. After silicon carbide is produced, it is crushed, processed, and screened into different particle sizes.

The size of the abrasive particles affects how aggressively the material cuts or removes a surface.

In general:

• Coarse grit removes material faster and produces a rougher finish.
• Medium grit provides a balance between material removal and surface finish.
• Fine grit produces a smoother surface and is commonly used for finishing and polishing.
• Very fine SiC powder is used for precision polishing, lapping, and other applications requiring extremely small particles.

For this reason, grit size is one of the most important specifications to consider when purchasing silicon carbide.

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What Do Silicon Carbide Grit Numbers Mean?

Silicon carbide grit is commonly identified using grit numbers such as #16, #24, #36, #46, #60, #80, #120, #220, #320, and finer sizes.

The basic rule is:

The lower the grit number, the coarser the abrasive particles. The higher the grit number, the finer the particles.

For example:

• #16 SiC → very coarse
• #36 SiC → coarse
• #60 SiC → medium-coarse
• #120 SiC → medium-fine
• #220 SiC → fine
• #320 SiC → very fine

However, grit number should not be interpreted as an exact particle diameter. Different grading standards can use different classification methods, so buyers should always confirm the applicable standard and particle size distribution with their supplier.

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Silicon Carbide Grit Size Chart

The following chart provides a general reference for common silicon carbide abrasive grit sizes.

SiC Grit Size	General Particle Range	Typical Applications
#16–#24	Very coarse	Heavy material removal, aggressive blasting
#30–#46	Coarse	Grinding, surface preparation, blasting
#54–#80	Medium	Grinding, blasting, deburring
#100–#120	Medium-fine	Surface finishing, lapping
#150–#180	Fine	Finishing and polishing
#220–#240	Fine	Fine grinding and lapping
#280–#320	Very fine	Precision finishing and polishing
Fine powder	Micron-sized	Precision polishing, lapping, advanced applications

Note: Actual particle size ranges may vary depending on the grading standard and supplier. For industrial purchasing, always confirm the specification and particle size distribution before ordering.

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Coarse vs. Fine Silicon Carbide Grit

The right grit size depends largely on the balance between material removal rate and surface finish.

Coarse Silicon Carbide Grit

Coarse grit contains larger abrasive particles and provides more aggressive cutting action.

It is suitable when you need to:

• Remove rust or coatings
• Remove material quickly
• Prepare rough surfaces
• Perform aggressive grinding
• Clean heavily contaminated surfaces
• Prepare surfaces before subsequent finishing

Common coarse sizes include:

#16, #24, #30, #36, #46

Coarse grit is generally not the best choice when a smooth final surface is required.

Fine Silicon Carbide Grit

Fine grit contains smaller abrasive particles and provides a smoother finishing effect.

It is commonly used for:

• Fine grinding
• Lapping
• Polishing
• Precision surface finishing
• Optical applications
• Ceramic finishing

Common fine sizes include:

#120, #180, #220, #240, #320 and finer powders

The trade-off is that finer grit generally removes material more slowly than coarse grit.

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How to Choose the Right Silicon Carbide Grit Size

When selecting silicon carbide, consider the following four factors:

1. What Material Are You Processing?

Silicon carbide can be used on many hard and brittle materials, including:

• Glass
• Ceramics
• Stone
• Non-ferrous metals
• Refractory materials
• Composite materials
• Semiconductor-related materials

The hardness and characteristics of the workpiece should influence your grit selection.

2. How Much Material Needs to Be Removed?

If the main goal is rapid material removal, a coarser grit is generally more appropriate.

If only a small amount of material needs to be removed, a medium or fine grit may provide better control.

3. What Surface Finish Do You Need?

This is one of the most important considerations.

Rough surface → Coarse grit

Intermediate finish → Medium grit

Smooth surface → Fine grit

Precision finish → Very fine grit or powder

4. What Is Your Application?

Different applications require different grit sizes. The same silicon carbide product may not be suitable for every process.

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Recommended Silicon Carbide Grit Sizes by Application

Application	Recommended Grit Range	Main Purpose
Heavy Sandblasting	Coarse grit	Fast material removal
Rust & Coating Removal	Coarse to medium	Surface preparation
Grinding	Medium to coarse	Material removal
Deburring	Medium grit	Edge and burr removal
Surface Finishing	Medium to fine	Improve surface quality
Lapping	Fine grit	Controlled surface finishing
Polishing	Fine grit / powder	Smooth surface finish
Precision Polishing	Very fine powder	High-quality surface finishing
Glass Processing	Fine to medium	Grinding and finishing
Ceramic Processing	Fine to medium	Grinding and surface preparation

Important: The recommended grit size is only a starting point. Actual selection should depend on the material, equipment, processing method, desired surface finish, and operating conditions.

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Black Silicon Carbide vs. Green Silicon Carbide: Does Grit Size Matter?

Both Black Silicon Carbide and Green Silicon Carbide are available in different grit sizes, so grit selection is not limited to one type of SiC.

The main difference is their composition, purity, and typical applications.

Black Silicon Carbide is commonly used for applications such as:

• Abrasive blasting
• Grinding
• Surface preparation
• Cutting
• General abrasive applications

Green Silicon Carbide has higher purity and is commonly selected for applications requiring high hardness and sharper cutting performance, such as:

• Precision grinding
• Lapping
• Polishing
• Ceramic processing
• Semiconductor-related applications

Therefore, buyers should consider both the type of silicon carbide and the required grit size when selecting a product.

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Silicon Carbide Grit vs. Silicon Carbide Powder

One common question from first-time buyers is whether they need silicon carbide grit or powder.

The main difference is particle size.

Silicon carbide grit generally refers to larger abrasive particles used for grinding, blasting, cutting, and surface preparation.

Silicon carbide powder consists of much finer particles and is commonly used for lapping, polishing, precision finishing, and specialized applications.

If you need aggressive material removal, start by considering a suitable grit size.

If you need a highly smooth or precise surface finish, a fine SiC powder may be more appropriate.

What Grit Size Should You Buy?

There is no single silicon carbide grit size that works for every application.

A simple starting point is:

For fast material removal:
Choose coarse grit such as #16–#46.

For general grinding and surface preparation:
Consider medium grit such as #54–#120.

For fine finishing:
Consider #150–#240.

For precision finishing and polishing:
Consider #280–#320 or finer silicon carbide powder.

However, these ranges are only general guidelines. For industrial applications, the best choice depends on the workpiece material, equipment, processing method, and required surface finish.

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What Should You Ask Your Silicon Carbide Supplier?

When requesting a silicon carbide quotation, don’t provide only the grit number.

A complete inquiry should include:

• Silicon carbide type: Black or Green
• Grit size
• Applicable grading standard
• SiC purity
• Particle size distribution
• Application
• Required quantity
• Packaging requirements

For example:

Green Silicon Carbide, #220 grit, for precision lapping, industrial grade, 1 ton.

Providing this information helps suppliers recommend the appropriate product and provide a more accurate quotation.

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Final Thoughts

Choosing the right silicon carbide grit size is mainly about finding the right balance between material removal, surface finish, and processing efficiency.

Coarse silicon carbide grit is generally suitable for aggressive material removal and surface preparation, while finer grit and silicon carbide powder are better suited to finishing, lapping, and polishing.

Before purchasing, always consider the SiC type, grit size, grading standard, application, and required surface finish rather than selecting a grit number alone.

If you are unsure which silicon carbide grit size is suitable for your application, providing your material, application, desired finish, and required quantity to the supplier can make the selection much easier.