HB Mortar is a chemically hardening, halogen free, 100% potassium silicate, acid- resistant brick mortar. It is especially suited for the installation and maintenance of linings in acid towers, tanks, process equipment, pressure leaching autoclaves and other similar systems in the acid-resistant construction industry. HB Mortar requires no acid wash and employs a unique, inorganic, patented hardening system which makes it particularly resistant to sulfation-hydration, crystal growths, and, when cured, water wash out. It conforms to ASTM C466. HB Mortar is not resistant to acid fluorides or hydrofluoric acid. Consult Corrosion Engineering specification CES-358 for complete installation details.