Process with excellent control of particle-size and unique coating technology. It is coate r915 for coating is rutile titanium dioxide pigments manufactured by the sulphate d with inorganic and special organic surface treatment. It has excellent pigment properties, with good whiteness and gloss, excellent hiding power strong tinting strength, superior weatherability and chalk resistance, is easy wetting and easy to disperse. R915 can endow the coating film bright color, enhance its mechanical strength & adhesion and keep it from crazing. It can also prevent the penetration of uv or moisture, improving the chalk resistance of film to extend its working life. Specification: Basic characters --------more than98.5% Technical specification Oil-phase whiteness(l)----95.4-95.9 Hue(b)----1.7-2.0 Relative scattering power(iso 787-24)------compared with standard more than 100% Ph value of aqueous suspension(iso 787-9)6.5-8.0 Oil absorption(iso 787-5)-----less than 20g/100g Resistivity of aqueous extract(iso 787-14)-more than80|¸m