Ammonium fluoride, is an inorganic compound, chemical formula NH4F, is an ionic compound, white crystalline powder, easy to deliquescence, soluble in water, methanol, slightly soluble in ethanol, insoluble in , mainly used as glass etching agent, wood and winemaking preservative, disinfectant, analytical reagent, zirconium drip reagent and fiber mordant and extraction of rare elements reagent.