CORLOK B Mortar is a two component halogen-free, chemically hardening inorganic potassium silicate brick mortar. It conforms to ASTM C-466. It is not formulated with sodium, calcium or fluoride-based products. It is not resistant to significant concentrations of acid fluorides or to hydrofluoric acid. Consult Corrosion Engineering specification CES-358 for complete installation details.