ammonium bifluoride Other names: ammonium bifluoride, ammonium hydrogen fluoride, ammonium acid fluoride, ammonium hydrofluoride, matte salt.Ammonium hydrogenfluoride is a compound formed from ammonium fluoride and hydrogenfluoride, with hydrogen fluoride molecules occupying spaces in theammonium fluoride crystal lattice. It is the major constituent inglass-etching fluid (though sometimes ...