What are the chemical composition of OPC

 Ordinary Portland Cement Chemical Properities :-

( A) Insoluble residue weight shall not exceed 1.5% (When dissolved in HCL) 

 (B) The weight of magnesia does not exceed 6%.  

(C) SO3, as the amount of sulfur does not exceed 2.75%.  

(D) The ratio of alumina and iron oxide should not exceed 2: 3.  

(E) Loss in ignition is not more than 4%.  

(F) Silica, alumina and gypsum with lime will remain completely reactive.