It is a colourless transparent or light yellow fuming, pungent odor liquid,can purify aluminium or uraniuma, etch glass,cleanin

Executive Standards GB 7744-1998

Item	Index
	Superior	Grade I		Standard
		HF-40	HF-55	HF-40	HF-55
Hydrogen Fluoride(HF)W/% ≥	40.0	40.0	55.0	40.0	55.0
Fluosilicic acid(H2SIF4)W/%≤	0.02	0.2	0.5	2.5	5.0
Fixed acid( in H2SO4)W/% ≤	0.02	0.05	0.08	1.0	2.0

Usage:

Hydrofluoric acid

metal cleaning

metal surface treatment

produce inorganic fluoride, organic fluoride

purify aluminium and uranium

dissolve oxides

etch glass, carve a design, mark scale and text

remove the oxide from the surface of silicon in semiconductor industry

“pickling” process of removing oxygen containing impurity from the surface of stainless steel

synthetize various fluoro-containing organics, such as Teflon(polytetrafluoroethylene)and refrigerant Freon.

40%-70% industrial hydrofluoric Acid