Which hose materials are compatible with phosphate-ester base hydraulic fluids?

Phosphate-ester base hydraulic fluids are typically aggressive towards many types of elastomeric materials. The compatibility of hose materials with these fluids is crucial to ensure the integrity and safety of the hydraulic system.

Butyl and Teflon (PTFE) are the recommended choices due to their excellent resistance to phosphate esters. Teflon, in particular, is chemically inert and does not react with most fluids, making it ideal for high-performance hydraulic applications. Butyl rubber also offers a level of compatibility that prevents degradation and maintains the performance of the hydraulic system in contact with phosphate-ester fluids.

In contrast, materials like Buna-N and PVC can suffer from swelling, softening, or complete failure when exposed to phosphate-ester fluids, making them unsuitable for such applications. Similarly, rubber and neoprene lack sufficient resistance and can degrade, leading to leaks or system failures. Silicone and ethylene-based materials may also not provide the necessary durability in contact with these aggressive fluids.