Grey portland cement We can supply grey portland cement 42, 5 n/r shall conform to international standard. Direct from seller Produktanalyse 42, 5 n/r Grey portland cement 42, 5 n/r shall conform to international standard Specifications: Origin: russia / ukraine / pakistan The cement must have got the "ce mark" and une 197-1/2000) Chemical analysis Rate of discharge : minimum 1.500 m/ton per day Formula typical analysis chemical analysis sio2 silicon Dioxide 21 % al2o aluminum oxide 5.30 % fe2o3 ferric oxide 3.30 % cao calcium oxide 65.60 % mgo magnesium oxide 1.10 % so3 sulphur Trioxide 2.70 % loi loss of ignition 0.90 % c3a tricalcium Aluminates 8.05 % c3s tricalcium silicate 60.00 % c2s dicalcium Silicate 15.00 % c4af tricalcium aluminous ferric 9.76 % physical Tests blaine 3.250 cm2/g autoclave expansion (le chat) 0.02 Mm compressive strength 3- days 230 kg/cm2 7- days 305 Kg/cm2 28- days 420 kg/cm2 initial setting time (vicat test) 105 min final setting time (vicat test) 135 min