1.Model Number:Grade 42.5 N/R 2.Color:Grey 3:Feature:Expansive,Radiation- ... Resistant 4:Main material:Silicate Grade 42.5 R/N Grey Portland Cement:We are Portland Cement traders on ... requirements. We offer Grey Portland Cement 42.5 N/R, same price for N or R. It conforms to International Standards, ... Portland Cement CEM I or CEM II Grade 42.5 N or R Chemical Composition: Silicon Dioxide (SIO2)21, ...