Bond It 1 Litre Proofer Hardener Concentrate Power Proof Cement 1L Description: A premium quality, concentrate additive that increases frost resistance and accelerates the setting time of cements by improving the rate of hydration. 5 x stronger than standard formulation. Conforms to EN934‐2:2009. Benefits: w Developed for brick laying and rendering subjected to low and sub‐zero temperatures. w Increases rate of curing of mortar to reduce the possibility of cracking caused by frost. w Chloride‐free formulation. w Non‐corrosive. w Will not degrade steel wall ties, reinforcements and other steel items. w Works by exothermic reaction. Uses To facilitate all year round construction where low, ambient temperature may normally cause a lull in the rate of production. Bond .