GNPGraystar‘s Pink and Ruby Fused Aluminum Oxide contain chromium oxide, which gives the material its pink and ruby color. The incorporation of Cr2O3 into the Al2O3 crystal lattice produces an increase in toughness and a reduced friability compared with White Fused Aluminum Oxide.

Compared to Brown Fused Aluminum Oxide, the Pink and Ruby materials are harder, more aggressive, and have better cutting ability. The grain shape of Pink & Ruby Aluminum Oxide is sharp and angular.

The FEPA F grades are especially suitable for the manufacture of vitrified bonded abrasives for working hardened steels and alloys with tensile strengths of over 50 kg/mm2. These are also used in tool grinding, saw and knife-sharpening applications, precision grinding, profile grinding, flute grinding, tooth grinding, dry grinding of blade segments, and mounted wheels.

The FEPA P grades are a preferred material for working non-ferrous metals and the alloys (copper, aluminum, zinc, brass, bronze), but also used for softer materials, such as wood, synthetics, and paints.

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