It is mainly used to produce fiber dyes, tanning agents, cleanser, welding compounds, varnish components, copper etching agents adhesives, electrogalvanizing agents, demulsifier, chelating agents, etc. It is low toxic, but since it is a strong acid, it causes serious irritation to skin and eyes. Protection equipment is a must for operating personnel. Production facilities should be airtight, while the operating site should be well ventilated. It should be packed in plastic vessels or iron drums with linings of 60 or 100kg net each.