Opc 42.5 specifications:
Chemical analysis:
Sillicon dioxide (sioz) % 20.25
Aluminium oxide (a1203) % 4.73
Ferric oxide (fe203) % 3.35
Calcium oxide (cao) % 63.44
Magnesium oxide (mgo) % 5.0 max. 3.15
Sulphur trioxide (so3) % 3.5 max. 2.91
Alkalles (na2o + 0658 x k2o) %0.50
Loss on lgnition %3.0 max. 1.05
Insoluble residue %1.5 max.0.51

Tricalcium sillicate (c2s) 66.0 max. 72.59
Dilicalcium silicate (c2s)
Tricalcium aluminate (c3a) %6.87
Tetra calcium aluminoferrite (c4af)10.18
Chloride 0.10 max. 0.021

Phusical tests:
Fineness, blalne test, (cm. -sqr. GM. ) 3260
Soundness, expansion (mm. )10 max. 1.0
Compressive strength: -
After 2 days (n/mm. Sqr. ) 20.0 min. 25.50
After 28 days (n/mm. Sqr. ) 42.5 min. 50.37
Setting time, vicat test. Initial (minutes) 60 min. 195

-ASTM C-150 Type I in the packaging of 50 Kg P.P Bags,
50 Kg 3 Ply Paper Bags, 1 Metric Ton Jumbo Bags, 2 Metric Ton Sling Bags.