quote from there site..
ABOUT OUR BOOTS:
As with all of our DIESELSITE products, these are QUALITY PARTS. We ordered sample upon sample of hose material and clamps until we were satisfied with the quality of the parts and certain of their integrity in our application. Our boots are made of hose that is reinforced with synthetic fabric. It will not kink or collapse. The special synthetic rubber is exceptionally resistant to heat, ozone, gasoline, gasohol, methanol, ethanol and diesel fuel. It can withstand the engine heat and 100psi boost pressure. This is virtually "indestructable" boot material. However, they will not survive a screwdriver through the side of them, so be careful when prying them loose. We don't warranty "screwdriver death" of our boots.
Our boots are Flourolastomer lined to handle oil, heat, etc. They have a 5 ply braided center section, and a textured outer rubber cover to grip on to the clamps. Fluoroelastomers are synthetic, rubber-like materials used in gaskets, O-rings and hoses. Their unique properties make these products ideal for high-performance aerospace and automotive applications or environments that are extremely harsh and challenging.
The most important thing you need to know is this: Silicone hose is NOT compatible with fuel or oil.For those that want the absolute best hoses you can buy, we made the units you see on our web site. These are not cheap silicon hoses. These are top quality tubes that are individually molded. These are not cut sections of some hose length.
