- 32% phosphoric acid etchant with benzalkonium chloride - Uni-etch is a 32% semi-gel phosphoric acid etchant with benzalkonium chloride (bac) and designed for etching tooth structure prior to bonding. - Bisco etchants are the only dental etchants with bac. Contains: - 4 syringes with bac (5gr each). - 60 disposable tips. - Instructions. **For further product information, please contact Chat Support**