Silicone Hoses are lined with Fluorosilicone rubber (FVMQ) for resistance to oil and fuel and their mists, and certain chemicals in the Charge-Air-Cooler, SCR, or EGR systems.
Flurosilicone has a vast temperature range, from -55⁰C up to +230⁰C.
However, when the hose is reinforced with Polyester, it should be used at a maximum of +180⁰C.
When reinforced with 100% meta-aramid, along with specialty Silicone-rubber grades, a Fluorosilicone-lined Silicone Hose can be used at higher temperatures.
At Shore Auto, we use a special grade of Fluorosilicone rubber (FVMQ), which not only has exceptional adhesion to Silicone rubber (VMQ) but also has outstanding resistance to oil, fuel, and other chemicals, at elevated temperatures. It is a grade that has been specifically developed in Japan for Turbocharger hoses.
Any dilution of the liner material potentially reduces the performance and resistance of the hose to oils and other chemicals.
Below are the physical properties of the Fluorosilicone used by us:
|Hardness (Shore A)||65|
|Tensile Strength (Mpa)||11.3|
|Elongation at Break (%)||405|
|Tear Strength (KN/m)||29|
|Compression Set (180 deg C, 70 hours)||27|
|Heat-ageing (225 deg C, 168 hours)|
|Tensile Strength change (%)||-40|
|Elongation change (%)||-33|