GMA Garnet™ abrasive is composed of natural Almandite garnet grains that are known for their natural hardness, durability and abrasive offers five grades: NewSteel™, SpeedBlast™, PremiumBlast™, Fine Superfine. GMA NewSteel™ garnet abrasive is a high performance blasting abrasive that delivers efficient and costeffective surface preparation on new steel surfaces ...