HYJET S4 is a synthetic hydrocarbon-based hydraulic fluid used in a variety of industries such as aircraft, automotive, industrial and marine. Common applications include hydraulic systems, power transmissions, and other industrial machinery.
When rubber is exposed to HYJET S4, common failures can include swelling, cracking, and hardening. Swelling is caused by the fluid's ability to permeate the rubber, making it become enlarged. Cracking can occur due to the fluid's high viscosity, which causes the rubber to become brittle and crack. Lastly, hardening can occur due to the rubber's low resistance to the fluid's physical and chemical properties.
EPDM o-rings, or ethylene propylene o-rings, are a family of synthetic elastomers with lower cost steam and chemical resistance, particularly for applications involving solvents, acids and other mild chemicals. Marco Rubber has the world’s largest inventory network of EPDM o-rings and made on demand custom manufacturing often without tooling fees, so the EPDM o-rings you need are always available. Whether it’s for water systems, braking systems, medical, pharmaceutical, food or dairy use, you can count on Marco Rubber to deliver your o-rings fast and efficiently.
View some of our other material compatibility ratings with HYJET S4. If you don't see what you're looking for or need more guidance, our team of experienced sealing design engineers can help select the best sealing products and material for your specific application.View Full Chemical Compatibility Guide