Formula: HF Molecular Weight: 20.01CAS :7664-39-3 nature: clear, colorless, fuming liquid, highly volatile, and metal salts, oxides, hydroxides fluoride reacts with strong corrosion. Use: the manufacture of organic and inorganic fluoride fluoride materials, glass etching, grinding polishing etc. Are used to clean metal surfaces. GB 7744-1998 "Industrial hydrofluoric acid" Item Index Top grade First grade Qualified product HF-40 HF-55 HF-40 HF-55 hydrogen fluoride (HF) content 40.0 40.0 55.0 40.0 55.0 fluoride acid (H2SiF6) content of 0.02 0.2 0.5 2.5 5.0 sulfuric acid (H2SO4) 0.02 0.05 0.08 1.0 2.0 content