Castrol Anvol SWX 68 Fire-Resistant Hydraulic Oil

Unlike some HFDU products Anvol SWX 68 does not use polymeric materials in order to pass spray ignition type tests. These polymeric materials can rapidly shear in service and this leads to a loss of the claimed spray test performance and also to a significant reduction in viscosity. The selection of Anvol SWX 68 for use in a hazardous environment should be based on its high fire point and lower calorific output (based on Factory Mutual Group 1 classification). A risk assessment should always be carried out whenever there is a need to select any type of fire resistant hydraulic fluid, based on factors such as the potential sources of ignition, fire prevention measures in place and potential consequences of a fire., Compatibility of Anvol WG 46 with hydraulic components: Metals – Compatible with all common metals and passes the corrosion tests for Type HF-C fluids as detailed in the SHCMOEI Seventh Luxembourg Report. Seal materials – Suitable materials are: Nitrile PTFE, Neoprene (Chloroprene) Silicone, Viton Nylon, Natural Rubber Butyl Rubber. Filters – Most metal types are compatible, but some paper elements can be damaged by water and only types approved for high water content fluids should be used. Paints – Fire-resistant water glycols soften and lift most paints. Vinyl or epoxy resin-based are compatible. When changing from mineral oil to water-glycol, all paint in the system should be removed unless it is known to be a compatible type. Fluid maintenance – In service, water can be lost by evaporation and this must be periodically replaced to maintain the correct viscosity and optimum fire resistance. Water content can be determined directly by laboratory analysis. Only condensate, distilled or de-ionized water should be used for top-up. The required quantity of water should be slowly added to the reservoir with the system running to ensure thorough mixing. Operating temperature range – from -20 to +60°C. Anvol WG will remain fluid down to approx -50°C, however, the increased viscosity will limit actual low temperature running. Care must be taken at temperatures above 60°C so water evaporation does not occur too readily and reduce fire-resistant properties.