Castrol Syntilo™ CR 4 is a synthetic coolant which has been developed for tungsten carbide grinding. Further it can be used for general grinding of ferrous metals. It forms a clear, stable solution in both hard and soft waters. Syntilo CR 4 exhibits good anti-corrosion properties coupled with long system life. Syntilo CR 4 is developed for surface, cylindrical, double disk and centreless grinding especially of tungsten carbide.