37% phosphoric acid in a liquid delivery form. Indications: Enamel etching and dentin conditioning for sealants, composite restorations, and for the adhesive cementation of restorations. Advantages: Micro-interlocking of Heliobond bonding agent with the etched enamel The material flows well into the fissures due to the low viscosity Reliable retention of the sealant, composite, and the seated restoration