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I'm aware Nylon is a polyamide. The different layers are not just for UV and moisture resistance. They are there for extra strength: ie "fiber reinforced" . That is why they can withstand 200PSI pressures. That regular poly hose from Home Depot will not withstand 200 PSI.Nylon is a polyamide, the different layers are for UV and moisture resistance. Nylon is quite sensitive to both. The non-DOT tube you are showing is polyethylene which has very low temperature resistance but is quite good on moisture.
This thread is about the many different types of NYLON tubing - and when to use what, right? And the one shown in pic 3 seems to be standard industrial Nylon (polyamide) hose? Not sure why you are bringing in polyurethane, which is a completely different material, for different uses? Maybe you meant to say polyamide, instead of polyurethane? But then, even standard Nylon (polyamide) tubing easily resists 200psi at room temperature - just not with a (certified) 5:1 safety factor. And it can very well be used for all kind of fuels and oils as well as brake fluids, including DOT5............. In picture three you see a standard polyurethane hose. ............ DOT hoses can withstand pressures over 200 PSI and handle air, water, fuel, and oils. Standard polyurethane hoses cannot.
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Not exactly... There is a "Type A" (= non-reinforced, single-wall extruded Nylon) and a "Type B" which has a pure Nylon core with a fiber reinforced Nylon jacket/sheath. Type A is allowed for outside diameters up to 5/16" while type B must be used for sizes above 5/16". Typically for air brake applications, both types have to meet SAE J844 and DOT FMVSS49CFR 571.106 specifications.All DOT hoses have fiber reinforced "polyamide core" with a Nylon cover/sheath........
This thread is about the many different types of NYLON tubing - and when to use what, right? And the one shown in pic 3 seems to be standard industrial Nylon (polyamide) hose? Not sure why you are bringing in polyurethane, which is a completely different material, for different uses? Maybe you meant to say polyamide, instead of polyurethane? But then, even standard Nylon (polyamide) tubing easily resists 200psi at room temperature - just not with a (certified) 5:1 safety factor. And it can very well be used for all kind of fuels and oils as well as brake fluids, including DOT5.