A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under perlitic.

A two-phased lamellar structure composed of alternating layers of alpha ferrite and cementite that occurs in some steels and cast irons, having a pearlescent appearance.

a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron

Suitable for Steel and Cast Iron Suitable for material up to 55HRC TiALN coating Helix-Angle: 35° 2 Flutes O.A.L : 6″ Flute Length: 3″ For Finishing and Semi-Finishing applications