1. is 269 1989 : specification for 33 grade ordinary portland cement click to download 2. is 650 1991 : standard sand testing of cement click to download 3.1. is 1489 1991 part1 : specification for portland pozzolona cement (fly ash based) click to download 3.2. is 1489 1991 part2 : specification for portland pozzolona cement (calcined clay based) read more.