Jasper Ore
The term applied to iron formations which are composed of steel-gray, crystalline or specular hematite, and finely granular quartz, with minor iron silicates. Jaspers are concentrated by froth floatation methods.

JP (Jet-Process)
1. Fully alloyed galvanneal product. 2. The aluminum percentage is reduced from the pot on the Galvanize lines; primarily zinc left; produces a flat, dull coating on the steel (Jet-Process).

Jumbo Coil
A single coil produced by welding two or more coils.