Used in petroleum cracking, polymerization catalysis, and metal surface treatments. Also employed in textile dyeing, pigment synthesis, and photoengraving solutions.

Corrosive and toxic if inhaled or ingested; reacts vigorously with metals and reducing agents. Use full protective equipment and local ventilation.

Supplied in 25 kg plastic-lined bags or drums. Store cool, dry, and tightly sealed, away from heat and organics.