Garnet Blasting Abrasive

Product Overview

Garnet blasting abrasive is a natural mineral abrasive made from almandine ore by crushing, magnetic separation and washing. It is deep red or reddish brown, with angular polyhedral grains, a Mohs hardness of 6.5-8.0, a true density of 3.8-4.3 g/cm³, stable chemistry and a melting point of approximately 1300℃. It contains no free silica, with total SiO₂ of 34%-43% and Al₂O₃ of 17%-28%, and provides an environmentally friendly blasting medium.

Core Performance Advantages

1. Hardness and toughness support reuse

With a hardness of 6.5-8.0, garnet is harder than conventional blasting materials such as quartz sand and resists fracture during blasting. Quality grades can be recycled to reduce operating costs.

2. Sharp edges for efficient rust removal

Angular, blocky grains provide strong impact to rapidly remove rust, scale and old coatings. The resulting uniform surface profile provides a good bond for subsequent painting and electroplating.

3. Low dust for safer, cleaner blasting

Multiple washing stages minimize dust. The abrasive contains no free silica and complies with international requirements such as ISO 11126, offering an alternative to quartz sand, copper slag and other conventional blasting media.

4. Chemical stability protects the workpiece

Garnet is chemically inert and resistant to acids and alkalis. It does not react adversely with workpiece surfaces, particularly stainless steel and aluminum requiring high cleanliness.

Grit Specifications

Garnet blasting abrasive is classified by grit size for different applications:

Custom grit sizes are available on request.

Chemical Composition

Typical Applications

Application areas and specific uses

Shipbuilding and steelwork: rust and contamination removal from hulls, bridges and large structures to SA2.5 or SA3.0 cleanliness grades

Metal preparation: cleaning and profiling before painting or electroplating to improve coating adhesion

Foundries and machining: removing scale, flash and burrs from castings and polishing heat-treated parts

Fine polishing: cleaning molds, precision components and gauges without damaging the substrate

Glass and stone: frosted glass effects, stone surface preparation and image etching

Denim finishing: fading, abrasion effects and whisker patterns

Packaging

Common packaging options include:

Standard packaging: 25 kg lined woven bags

Bulk packaging: 1 ton bags

Custom packaging: special options on request

Storage and Usage Recommendations

Store in a cool, dry, ventilated place away from moisture.

Before use, match blasting pressure and nozzle diameter to the selected grit size.

Wear a protective face shield, a dust mask and protective gloves during blasting.

Recovered garnet can be reused after screening; inspect grain breakdown regularly.