Garnet sand blast media

Garnet abrasives is a kind of sand ground from garnet, which has the characteristics of high hardness, high temperature resistance, and stable chemical properties. Its hardness is between 7.5 and 7.9 on the Mohs scale, and its specific gravity is 3.98. Garnet sand has uniform particles, high grinding efficiency, and no scratches.

1. Sandblasting - garnet abrasive has moderate hardness, high packing density, no free silica, high specific gravity and good toughness
2. Free grinding - grinding grade garnet abrasive is used for free grinding in the fields of picture tubes, optical glass, single crystal silicon, lenses, watch glass, crystal glass, jade, etc. It is a commonly used grinding material in China;
3. Resin abrasives - garnet abrasive has suitable color, good hardness, toughness, suitable particle cross-section type and edge retention, and can be used as a filler to replace a small part of brown corundum for resin abrasives, with better results;
4. Coated abrasives - garnet abrasive is the raw material for sandpaper, gauze and other manufacturers;
5. Function Filler - mainly used in automobile brake parts, special tires, special building products and other fields, can be used as materials for building highway pavement, runway, dock parking lot, industrial floor, sports field and other materials;
6. Filter medium - is a new application field of garnet, using granular garnet as the bottom medium of the filter bed to purify drinking water or wastewater. It is a new water filtration material at home and abroad, especially suitable for non-ferrous metal beneficiation: oil drilling mud weighting agent;
7. Water jet cutting - uses garnet abrasive as cutting medium, relying on high-pressure hydraulic jet for basic cutting, and is used in the cutting of oil (natural gas) pipelines, steel and other parts. It is a new cutting method.

 In water jet cutting applications, the garnet can be crystallised to meet its particle size requirements of 0.06-1.0 cm. Compared to diamond wheels and wire saws, water jet cutting using garnet offers good three-dimensional adaptability and low cost, excellent processing properties, essentially dust-free and no pollution. 

In abrasive water jet cutting, the nature and characteristics of the abrasive particles become the most important factor as the abrasive does more than 90% of the cutting work. The most commonly used abrasive is garnet sand with a particle size of 60-100 mesh, the harder the abrasive the shorter the life of the nozzle, which is why silicon carbide and diamond are clearly harder but rarely used. 

Natural iron and aluminium garnet is the ideal and most economical high pressure water jet cutting media due to its unique physical properties, high hardness, moderate cutting ability and absence of free silicon.

According to research, there is an optimum abrasive size for cutting any material with water jets, i.e. the maximum depth of cut can be obtained at a certain size under the same jet pressure and flow rate, while increasing or decreasing the size, the depth of cut is reduced accordingly. And for different hardnesses of abrasives, used for cutting different materials, the effect varies. For brittle materials, plastic materials and softer materials, the requirements for abrasives are also different. For the same abrasive and for the same cutting material, different water pressure and sand flow rates have a great influence on the cutting results. There is also an optimum water pressure and sand flow rate during the cutting process.

Currently, water jet grade grenadilla sand is mainly available in 60 mesh, 80 mesh and 120 mesh.

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