Hydro-Safe 620 is a non-flammable, water-glycol hydraulic fluid with excellent hydraulic properties and fire resistance. Hydro-Safe 620 protects machine components against rust and corrosion. Its excellent lubricity helps prevent wear and abrasion in hydraulic systems and bearings. Hydro-Safe 620 is compatible with synthetic rubbers, including BUNA-N, but is not recommended for use with polyurethane. It is suitable for use with all ferrous metals and most non-ferrous metals. It is compatible with aluminium only when anodised and is not suitable for use with cadmium or zinc.