Classification opinions
… 1. Chromium-aluminium cylinders , consisting of compacted metal powder … of 75−90 % of 99 % pure chromium powder, 10–25 % pure aluminium powder, up to 1 % of a surfactant in the form of … oil hydrocarbon, and, up to 1 % of a fluxing agent, e.g., aluminium inorganic salts, potassium fluoroaluminate, …