Garnet as a Blasting Abrasive
Garnet: One of the Blasting Industry’s
Hardest and Heaviest Mineral Abrasives
Many abrasive suppliers advertise the hardness of their abrasives by reference to the Mohs scale. The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. Garnet is ranked between 7.5 and 8.5 on the Mohs scale.
The Mohs scale is an ordinal scale that simply tells us which minerals or materials are as hard as or harder than others. The scale does not show how much harder one mineral is as compared to another. This limits the value of the scale when considering the productivity of a blast abrasive.
The harder the abrasive, the shorter the blast time.
Barton uses the Knoop Hardness Number to compare our abrasives against the competition.
The table below compares the hardness of Barton’s garnet to the hardness of typical abrasives used in the blasting industry. This clearly shows garnet to be significantly harder than all other commonly used blasting abrasives. It is the unique pairing of garnet’s specific gravity (density or heaviness) with its unparalleled hardness that makes Barton’s garnet the ideal material for high-performance abrasive blasting. Blasting with softer abrasives, or using impure garnet high in tramp materials, results in a poor profile and costs time and money.
Barton’s garnet is 2 to 4 times harder and up to 2 times heavier than ordinary abrasives like crushed glass, coal slag, olivine and staurolite. Our garnet abrasives are available in a variety of particle sizes to match your application needs more precisely and to work more cost-efficiently.