Rezklad HP Grout C Epoxy Novolac resin, carbon filled Rezklad HP Grout Hydrofluoric acid, high concentrations of sodium and potassium hydroxide ASTM C658, ANSI A118.3 compliant USDA certifiable Download Datasheet Posted in Corrosion-Resistant Construction Materials, Grouts, Setting Beds, Grouts, and Mortars.