Online Cement, creates a strong binding material, hardening permanently when dry. Construction bonding material which chemically reacts to water. Composed mainly of clay and calcining lime, it can be mixed with water to create a mortar, and mixed with sand and gravel to form concrete. Manufactured by leading brands Hanson and Parex these cost-effective, high-quality bonding materials are available from stock for both Trade and DIY customers at C & W Berry.