How to choose the correct media to sandblast?

Media

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Description

Used for

Hardness

Shape

Glass Beads

Glass Beads are manufactured into preformed ball shapes, which are very effective in leaving very smooth surfaces. It produces a super smooth and brighter finish compared to angular abrasives. Glass Beads can be recycled approximately up to 30 times.

Commonly used for automotive restoration, stainless steel fabrication, polishing of castings, and light deburring of metal molds and parts.

6-6

Round

Steel Shot

Steel Shot is manufactured into a spherical pellet-type abrasive made from carbon steel. It often produces a very smooth surface after use.

Steel shot abrasive is often used in cleaning and polishing metal surfaces and parts in automotive, aerospace, construction, foundry, shipbuilding, rail, and more.

40-51 HRC

Spherical

Steel Grit

It is softer than Aluminum Oxide Grit but still has a very high hardness quality. It has very fast stripping action and shot-peening applications.

It is commonly used in cleaning, etching, and surface preparations.

40-65 HRC

Angular

Corn Cob Grit

Corn Cob Grit is an organic, soft, and natural abrasive from hard cob. It is tumbling and absorbent that dries surfaces. Corn cob grit is non-toxic and safe for operators.

It is best used on wood surfaces and does not create any damage on the treated surface. It is used on oily and moist surfaces that quickly absorb it while finishing rough parts.

4-4.5

Ground, Angular shape

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Walnut Shell Grit

It is a very versatile soft abrasive, organic, and biodegradable. Same as corn cob, it is non-toxic and imposes no hazard to health.

Best used in stripping and cleaning delicate surfaces and parts, Walnut Shell Grit provides effective applications such as cleaning hardwoods and aircraft and automotive stripping.

4.5-5

Angular

Copper Slag / Iron Silicate

In contrast to its name, it contains almost no copper. It is referred to as the best abrasive to use when ranked on cutting speed and cost per sq. ft.

It comes in an extra fine-grade abrasive that is used for surface blast-cleaning carpets, plastic, and wood.

7

Angular

Garnet

Garnet is a natural silicate mineral deposit. It has a high stripping rate, very low dust and the lowest consumption rate.

Mainly used for wet or dry sandblasting and offers excellent coating preparation and adhesion properties.

6.5 - 7.5

Angular to Subangular

Glass Is An Environmentally Sound Media Effective At Blasting Multiple Surfaces Including Wood

The two forms of glass media most popular with blasters who use them are crushed glass and glass beads.

Crushed Glass

Crushed glass abrasive blasting media is effective due to its angled, irregular shape &#; and being made from 100% recycled bottle glass it helps reduce landfill waste.

Crushed glass abrasive is also inert, contains no free silica, no heavy metals and is a great substitute for slag.  It&#;s often used for removing very thick or elastometric coatings.

Glass Beads

Glass beads remove light coatings and are far less aggressive than crushed glass on the substrate.  They are usually employed in the blasting of softer metals such as brass, aluminum, plastic, or die-cast surfaces.

Like crushed glass, glass beads are also void of free silica and impart no toxic residue upon the blasted surface.

Glass bead media are spherical and leaves a dimpled pattern with what can best be described as a &#;dull shininess&#;.  Although it leaves even and spherical impressions, glass beads will not cause dimensional change to the substrate.

Glass beads are best suited for blast pot set between 40psi and 80psi max pressure.

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