Vanstone Precast (Pty) Ltd | Hardie Muller St, Rosslyn, Pretoria, 0200, Gauteng

Vanstone was established in 1948 and has been a household name in precast concrete products ever since. The Vanstone name is synonymous with quality and service in the industry.At Vanstone we aim to Ensure that manufacturing and delivery promises are met.Utilize modern technology, supported by highly motivated and well trained personnel.Be large enough to handle large and complex orders and projects and small enough to respond immediately and efficiently to our customers' needs.The Vanstone factory is in Rosslyn, Gauteng, South Africa.The production of Ordinary Portland Cement, or OPC, is an energy intensive process that uses naturally mined raw materials. The two main ingredients are limestone, CaCO3, and silica, SiO2, which are kiln heated to temperatures of up to 1450°C. The most important chemical reaction is CaCO3 > CaO + CO2, where CaO (calcium oxide) is the most common ingredient of cement. CO2 gas is released into the atmosphere.