WPC is headquartered in Oak Creek, Wisconsin, and is the sole remaining U.S. manufacturer of strontium chromate, used for the paints and coatings industry, and has operated in Wisconsin since 1975.

Chrome-based products like strontium chromate are subject to a number of environmental and safety regulations. WPC stores some products in an explosion-proof room.

The Royal Australian Air Force's B300 King Air fleet was suspended on June 30 after revelations the flight crew had been exposed to the highly dangerous chemical strontium chromate.

The 10 substances are Arsenic acid, technical MDA, Dichromium tris, Strontium chromate, Potassium hydroxyoctaoxodi¬zincatedichromate, Pentazinc chromate octahydroxide, Diglyme, DMAC, ...