Ammonium bifluoride

Ammonium bifluoride (CAS 1341-49-7, EC 215-676-4), also known as ammonium acid fluoride or acid ammonium fluoride, is an inorganic fluoride salt with the formula F2H.H4N. It carries no E-code designation and is classified under HS code 28261900 within the salts and minerals category.

In electronics manufacturing, ammonium bifluoride functions as a glass and oxide etchant, releasing hydrogen fluoride in solution to selectively dissolve silicon dioxide layers. In textile and paper processing, it acts as a pH buffer and flame retardant by releasing fluoride ions that interact with cellulose substrates at elevated temperatures to suppress combustion. Metal surface treatment operations in mining and metals also rely on it to remove oxide scale prior to further processing.

The product is supplied as white scales or flakes and falls under REACH registration requirements for industrial supply within the EU. Procurement teams should confirm SDS documentation and packaging format directly with the supplier, as quantities and container specifications vary by application and volume.