Fluorosilicone (FMVQ) and fluorocarbon (FKM) lined hoses for fuel, oil and chemical resistance

Where oil, oil mist, fuel and or, certain chemicals may be present in turbo-charger and other air or exhaust gas systems, it is necessary to use a fluorosilicone or fluorocarbon liner in a silicone hose. Normal silicone is not resistant to oil which, swells the silicone and permeates through wall of the hose.

A Fluorosilicone or Fluorocarbon lining can also be used to protect against OAT coolants, certain aggressive rust inhibitors sometimes used in coolant systems bi-products from EGR systems and other chemicals.

Fluorosilicone, when used with an appropriate silicone compound and fabric reinforcement, offers good temperature stability from -55⁰C up to +230⁰C.

Fluorocarbon lined hoses offer slightly better high temperature stability however, are not as suited to use at extreme low temperatures. Fluorocarbon is more resistant to and is required where an acidic environment is a risk, including some EGR bi-products.


Leyland Hose & Silicone offer both types of hose. When producing FVMQ and FKM lined hoses, it is vital to use only the highest quality materials. Unlike some manufacturers who dilute the lining material to reduce cost, Leyland Hose & Silicone use only 100% pure material, guaranteeing the best possible resistance to oils and chemicals.

Any dilution of the liner material, potentially reduces the performance and resistance of the hose to oils and other chemicals.

By using only the highest quality materials, LHSS silicone hoses offer superior reliability even when operating under the extreme conditions found on modern Euro 6 engines. Our Turbo-charger and intake hoses are used by many OE vehicle manufacturers in Euro 5 and Euro 6 applications.

Benefits of Fluorosilicone Lined Hoses

  • 100% fluorosilicone liner

  • Used to protect against OAT coolants

  • Outstanding resistance to fuel, oil & certain chemicals.

  • Hoses perform over a much wider temperature range (-55ºC to +230ºC)


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