Guide to Abrasive Types, Backings, Bonds and Coatings

Selecting the proper abrasive material and backing system is essential for achieving maximum grinding efficiency, longer product life, and superior finishing performance. Understanding the characteristics of different abrasive grains, backing materials, bond systems, and coating structures helps users choose the right product for every application.

Abrasive Types

Emery (02)

Emery is a dark gray, naturally occurring abrasive with rounded particles that tend to polish rather than aggressively remove material.

Applications

• Metal cleaning

• Surface polishing

Features

• Fine polishing action

• Smooth finish

• Suitable for light-duty operations

Garnet (03)

Garnet is a reddish-brown natural abrasive that offers medium hardness and sharp cutting edges. Although less durable than synthetic abrasives, it produces excellent finishes on wood surfaces.

Applications

• Wood sanding

• Softwoods such as pine

Features

• Excellent surface finish

• Sharp cutting action

• Ideal for hand sanding

Silicon Carbide (04)

Silicon carbide is the hardest and sharpest manufactured abrasive. Its extremely sharp grain structure provides rapid stock removal and cool cutting performance.

Applications

• Cast iron

• Aluminum, brass and bronze

• Glass, rubber and plastics

• Stone and ceramics

• Stainless steel finishing

• Particleboard sanding

Features

• Extremely sharp cutting edges

• Fast material removal

• Cool cutting performance

• Suitable for non-ferrous materials

Light Brown Aluminum Oxide (07)

Light brown aluminum oxide combines toughness with sharpness and continuously generates new cutting edges under pressure.

Applications

• Wood sanding

• Non-ferrous metal finishing

Features

• Long service life

• Cool cutting

• Good self-sharpening ability

Brown Aluminum Oxide (08)

Brown aluminum oxide is one of the most widely used abrasives due to its excellent toughness and wear resistance.

Applications

• Carbon steel

• Ferrous metals

• Aluminum

• Hardwood

Features

• High durability

• Strong penetration ability

• Excellent performance at high speeds

Heat-Treated Aluminum Oxide (09)

Heat-treated aluminum oxide offers improved toughness and cooler cutting compared with standard aluminum oxide.

Applications

• Metal grinding

• Wood sanding

Features

• Long life

• Fast cutting action

• Reduced heat generation

Zirconia Alumina (11,12)

Zirconia alumina is an ultra-tough abrasive with a microcrystalline structure that enables controlled grain fracture and self-sharpening.

Applications

• Heavy-duty grinding

• Stainless steel

• Carbon steel

• Aluminum

• Fiberglass

• Rubber and plastics

• Wood and particleboard

Features

• High stock removal rate

• Excellent self-sharpening

• Long service life

• Cooler grinding

Ceramic Alumina (25)

Ceramic alumina features an ultra-fine microcrystalline structure that continuously exposes new sharp cutting points during grinding.

Applications

• Stainless steel

• Carbon steel

• Nickel alloys

• Titanium alloys

• Exotic alloys

• Ferrous and non-ferrous metals

Features

• Superior self-sharpening

• Highest cutting efficiency

• Longer service life

• Reduced heat generation

• Outstanding performance on hard-to-grind materials

Backing Types

Backings provide support and anchor the abrasive grain to ensure stability and durability.

Paper Backing

Paper backing is economical and produces consistent surface finishes.

Available Weights

• A Weight – Very flexible

• B Weight

• C Weight

• D Weight

• E Weight

• F Weight – Heavy-duty

Applications

• Hand sanding

• Sanding sheets

• PSA discs

• Sanding rolls

• Belts and discs

Advantages

• Cost-effective

• Smooth finish

• High flexibility

Cloth Backing

Cloth backing offers excellent strength and flexibility for demanding applications.

Types

J Weight (Jeans)

• Lightweight

• Highly flexible

X Weight (Drills)

• Medium to heavy-duty

• Most versatile

Y Weight

• Heavy-duty

• High stock removal operations

Materials

• Cotton

• Polyester

• Polyester/Cotton blends

Advantages

• High tear resistance

• Long life

• Excellent flexibility

Fiber Backing

Vulcanized fiber is produced from compressed cotton fibers treated under heat and pressure.

Applications

• Resin fiber discs

Advantages

• Exceptional strength

• High durability

• Suitable for aggressive grinding

Bond Types

Bond systems secure abrasive grains to the backing and determine product strength and flexibility.

Make Coat

The first adhesive layer applied to the backing that anchors the abrasive grain.

Size Coat

The second layer covering the abrasive grain, providing additional grain retention and mechanical strength.

Common Bond Systems

Glue Over Glue

Features:

• Maximum flexibility

• Suitable for hand sanding

Urea Over Glue

Features:

• Improved durability

• Balanced flexibility

Resin Over Resin

Features:

• Moisture resistant

• Heat resistant

• Superior grain retention

• Harder and stronger structure

• Long service life

Coating Types

Open Coat

Open coat products contain approximately 50–75% abrasive grain coverage, leaving spaces between grains.

Advantages

• Reduces loading

• Prevents clogging

• Longer sanding life

Ideal For

• Wood

• Soft metals

• Materials producing heavy dust

Closed Coat

Closed coat abrasives feature nearly 100% grain coverage for maximum cutting efficiency.

Advantages

• Higher stock removal

• Longer product life

• Aggressive cutting action

Ideal For

• Metals

• Hardwood

• Heavy-duty grinding and sanding

Conclusion

The performance of coated abrasives depends on the proper combination of abrasive grain, backing material, bonding system, and coating structure. Whether for wood, stainless steel, aluminum, titanium alloys, or exotic metals, selecting the appropriate abrasive technology ensures maximum productivity, longer service life, and superior finishing quality.