Kramer Industries Inc. > Blasting Media Selection Guide

Blasting Media Selection Guide

It is important to know the differences in blasting media, since different abrasive blasting media are required for different applications. Blasting media can be used for purposes such as cleaning, stripping, etching, strengthening and polishing. In addition to the media type, grit or mesh size is another factor to consider for your application. The final choice of media depends on the nature of the work required and on the blasting equipment that is employed. The blasting media selection guide below contains a list of the common blasting media and the differences in blasting media.

Aluminum Oxide Grit (Standard)

Aluminum Oxide Grit (Standard) is the most widely used abrasive in blast finishing and surface preparation Aluminum Oxide Grit is an extremely sharp, long-lasting blasting abrasive that can be recycled many times. In addition to the standard brown, Aluminum Oxide Grit (Standard) is available in 99.5% pure white grade. Hardness 8-9; Grit size range 8-1200; Angular shape. Compare

Kramblast Crushed Glass Grit

The angular nature of Kramblast Crushed Glass Grit allows for aggressive surface profiling and removal of coatings and surface contamination. Kramblast Crushed Glass Grit contains no free silica, is non-toxic and inert and contains no heavy metals typically found in coal and copper slags. Since Kramblast Crushed Glass Grit is lighter than many slags up to 50% less media can be used. Hardness 5-6; Grit size range Coarse to Fine; Angular shape; Consumable. Compare

Glass Beads

Manufactured from lead-free, soda lime-type glass, containing no free silica, Glass Beads are manufactured into preformed ball shapes. Glass Beads produce a much smoother and brighter finish than angular abrasives. Glass Beads can be recycled approximately 30 times. Hardness 5-6; Mesh size range 50-325; Round shape. Compare

Silicon Carbide Grit

As the hardest blasting media available, Silicon Carbide Grit is has a very fast cutting speed. Manufactured to a blocky grain shape that splinters, Silicon Carbide Grit can be recycled many more times that other blasting media. The hardness of Silicon Carbide Grit is ideal for etching of glass and stone. Hardness 9-9.5; Grit size range 8-1200; Angular shape. Compare

Plastic Abrasive Grit

Plastic Abrasive Grits are available in a variety of types that deliver quick stripping rates and consistent performance. This media is ideal for stripping coatings and paint from substrates, including aluminum and other delicate metals, composites and plastics. The relative softness of Plastic Abrasive Grit media makes it ideal for automotive and aerospace blasting applications. Hardness 3-4; Grit size range 12-80; Soft, angular shape; Urea, Melamine, Acrylic compositions. Compare

Pumice Grit

Pumice Grit is a light, natural mineral that is used chiefly as a mild abrasive. Pumice Grit is ideal for less aggressive operations where protection of the surface is of supreme importance. Hardness 6-7; Grit size range 14-325+ Compare

Steel Shot

Blasting with Steel Shot is a popular method for cleaning, stripping and improving a metal surface. Steel Shot is manufactured into a round ball shape that results in a smooth and polished surface. The peening action of the Steel Shot produces improved compressive strength to metal surfaces. Hardness 40-51 HRC; Grit size range S-110 to S-780; Spherical shape. Compare

Steel Grit

High-demand, aggressive applications are ideal for Steel Grit. Steel Grit offers a very fast stripping action for many types of surface contaminants from steel and other foundry metals. Softer than Aluminum Oxide Grit (Standard) but still angular in shape, steel grit will not fracture as easily making it perfect for creating an etched surface on metal. Hardness 40-65 HRC; Grit size range G-12 to G-80; Angular shape. Compare

Corn Cob Grit

Corn Cob Grit is an organic, soft blasting grit that is safe for delicate parts and soft substrates. As the preferred blasting media for log homes and other wood surfaces, Corn Cob Grit offers excellent cleaning and stripping properties without damage to the substrate. Hardness 4-4.5; Grit size range Extra Coarse to Extra Fine; Ground, Angular shape. Compare

Walnut Shell Grit

Walnut Shell Grit is used for applications that require aggressive stripping or cleaning without damage or effect on the underlying substrate. Organic and biodegradable, Walnut Shell Grit is extremely durable, angular in shape but is considered a soft abrasive. Walnut Shell Grit sees utility in applications such as cleaning hard woods and aircraft and automotive stripping. Hardness 4.5-5; Grit size range Extra Coarse to Extra Fine; Angular shape. Compare

Nu-Soft Steel Shot

Nu-Soft Steel Shot is a unique blasting media engineered specifically for blasting soft or delicate surface. The high density and extreme durability make this an efficient and cost effective media for many applications. Nu-Soft Steel Shot is supplied in round ball shape that results in a smooth and polished surface. Hardness <20 HRC (3-3.5 MOHS); Grit size range NS-70 to NS-330; Spherical shape. Compare

Copper Slag / Iron Silicate

Copper Slag / Iron Silicate is ideal when a quick and efficient paint stripping process is required. It produces a heavy to medium etch depending on the grade and leaves the surface to primed and painted. Copper Slag is ideal for large commercial projects like bridge repainting, pipeline re-coating, and ship and boat stripping. Copper Slag is a consumable, silica-free premium alternative to silica sand. Hardness 7.5 MOHS; Grit size from Coarse to Fine; Angular

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