Castrol Hysol 33FF Semi SyntheticDescription Castrol Hysol 33 FF is a high performance semi synthetic metalworking fluid, formulated without formaldehyde releasing agents. It contains an additive package that helps to enhance machining performance and surface finish, provide good product stability and lower the overall operations costs. Hysol 33 FF is suitable for large central systems and single sump machines. Application Hysol 33 FF is especially designed for multi metal machining