Everbuild 207 Zeromix C.f.f. Admixture Is A Double Action Frostproofer And Air Entraining Mortar Admixture For Use Throughout The Winter Period. Everbuild 207 Zeromix C.f.f. Admixture Improves Workability Of Mortar And Increases Resistance To Frost In Both Wet And Hardened State. Everbuild 207 Zeromix C.f.f. Admixture Is Chloride Free, Can Be Used With Steel Reinforced Concrete Structures.