Castrol Syntilo™ 9923 is a mineral oil free synthetic coolant especially developed heavy duty machining of aluminium alloys and other aerospace alloys. It forms a clear, stable solution in both hard and soft waters. Syntilo 9923 contains a combination of surfactant chemistry that provides superior lubrication and excellent cooling properties. It can be used in both single sump machines as well as central systems. Castrol Syntilo 9923 is recommended for grinding, honing, milling, turning, boring, drilling and tapping on aluminium and aerospace alloys including nickel alloys.