Kramer Industries Inc. > Blasting Media Comparison Chart

Media

Aluminum Oxide Crushed Glass Grit Glass Beads Silicon Carbide Plastic Abrasives

Description

Sharp, long lasting media for fast etching & profiling; Brown/black or White Silica-free, 100% recycled glass; Efficient, economical stripping Round, soda-lime glass to produce a bright, satin finish; Minimizes stress on part Very hard, aggressive cutting media; Ideal for stone, glass and hard surfaces Abrasive, soft media designed for automotive & aerospace applications

Surface Profile

High etch Medium-high etch No etch, satin finish Very high etch No etch, stripping

Working Speed

Fast Fast Medium-
fast
Very fast Medium

Recyclability

High None; consumable High High High

Surface Removal

Yes Slight Slight Yes Slight

Hardness, Moh

8 – 9 5 – 6 5 – 6 9 – 9.5 3 – 4

Bulk Density

110 lbs/ft³ 100 lbs/ft³ 95 lbs/ft³ 90 lbs/ft³ 50 lbs/ft³

Media

Pumice Steel Shot Steel Grit Corn Cob Walnut Shells

Description

Natural volcanic ash; light-weight, mild abrasiveness Carbon steel, round spheres designed for polishing and peening applications Angular, carbon steel for fast stripping & aggressive cleaning Organic, soft media ideal for soft surfaces such as wood Angular, organic grit for mildly aggressive stripping w/out damage to surface

Surface Profile

Low etch No etch High etch None Low etch

Working Speed

Medium-
slow
Medium Medium-
fast
Slow Medium-
slow

Recyclability

Low Very high Very high Low Low

Surface Removal

No No Moderate No Very slight

Hardness, Moh

6-7 40-51 HRC 40-65 HRC 4-4.5 4.5-5

Bulk Density

35-40 lbs/ft³ 230 lbs/ft³ 260 lbs/ft³ 40 lbs/ft³ 50 lbs/ft³

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