Extenders and fillers: some new materials

Lawrence Industries, Mitcham Industrial Estate, Streatham Road, Mitcham, Surrey CR4 2AP, market the Engelhard ASP range of aluminium silicates and the Reichard Coulston iron oxides — both from the USA. The latter have recently added 1475SS iron oxide to their range, which is recommended for top quality primers. It is a naturally occurring high iron content ore which has been thermally treated to improve its chemical properties and lower the water soluble salts content.