Calcium aluminate

Calcium aluminate (CAS 12042-68-1, EC 234-931-0), also known as monocalcium aluminate or CA, is an inorganic compound formed from calcium oxide and aluminium oxide. It is a primary reactive phase in calcium aluminate cements (CAC), distinguishing them from ordinary Portland cement by their rapid strength development and chemical resistance.

In construction, CA drives the hydraulic setting of refractory and rapid-hardening concretes by reacting with water to form calcium aluminate hydrates, binding aggregates under high-temperature or chemically aggressive conditions. In water treatment, it functions as a coagulant, destabilising suspended particles and colloids through charge neutralisation to accelerate sedimentation.

Calcium aluminate is supplied as a technical-grade powder and is subject to REACH registration requirements for industrial supply within the EU. Procurement quantities typically range from 25 kg bags to bulk. Buyers should confirm grade specification and alumina content with the supplier to match application requirements.