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

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Multiple Choice

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

Explanation:
Phosphate-ester base hydraulic fluids are highly aggressive toward many elastomer materials, so hoses must use materials with excellent chemical resistance to prevent swelling, softening, or failure. Butyl rubber resists these esters well, and PTFE (Teflon) is essentially inert to them, providing a very stable barrier against chemical attack. Together, butyl and PTFE offer the necessary resistance to phosphate-ester fluids, making hoses built with these materials compatible with such fluids. In contrast, nitrile (Buna-N), neoprene, and nylon are more susceptible to degradation or swelling when exposed to phosphate-ester fluids, which is why they’re not as suitable.

Phosphate-ester base hydraulic fluids are highly aggressive toward many elastomer materials, so hoses must use materials with excellent chemical resistance to prevent swelling, softening, or failure. Butyl rubber resists these esters well, and PTFE (Teflon) is essentially inert to them, providing a very stable barrier against chemical attack. Together, butyl and PTFE offer the necessary resistance to phosphate-ester fluids, making hoses built with these materials compatible with such fluids. In contrast, nitrile (Buna-N), neoprene, and nylon are more susceptible to degradation or swelling when exposed to phosphate-ester fluids, which is why they’re not as suitable.

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