Bisco Porcelain Etchant 4% Hydrofluoric Acid Gel, Without Barrier, 7 g Bottle

Bisco Porcelain Etchant 4% Without Barrier Gel is a hydrofluoric acid etching gel formulated to condition porcelain and other silica-based ceramic surfaces before adhesive bonding. The 4% gel creates controlled surface micro-roughness that enhances micromechanical retention for resin cements and bonding agents, and its viscous consistency allows precise application to veneers, inlays, onlays, and crowns with minimal run-off. Supplied in a 7 g bottle, the without-barrier formulation provides direct etching performance on silica-based ceramics when used with proper isolation, rinsing, and neutralization protocols.