Profile: Calportland Company provides building materials and construction solutions. Our products include cement, concrete, aggregates, asphalt and other building products. We specialize in Portland cement. The Portland cement, type II is a general purpose cement that contains tricalcium aluminate (C3A) for moderate sulfate resistance. It is used when moderate heat of hydration is needed. The class G Portland cement is an oil well cement designed for use in extremely hot environments with high pressures. It has predictable retarder response, that makes it suitable for the oil well industry.