This product is industrial grade ammonium fluoride:

Properties: colorless leaf or acicular crystal, sublimated to obtain hexagonal columnar crystal. Easy deliquescence. Soluble in water, aqueous solution is acidic. Soluble in alcohol, insoluble in acetone and liquid ammonia. Density 1.11g/ml at 20℃.

Uses: glass etch agent, wood and wine preservatives, disinfectants, analytical reagents zirconium drop reagent and fiber mordant and rare element extraction reagent