Aluminum timing pulleys are also considered lightweight, although heavier than nylon. They have moderate inertia control, and display excellent wear characteristics. They are mechanically durable, but have some oxidation issues if untreated (clear coat or anodizing).
Additives to the nylon can give the end user important, and sometimes necessary, properties including material that is UL94-V0 flame retardant, FDA and RoHS compliant or non-conductive for static sensitive processes. Nylon pulleys, timing or otherwise, have no magnetic signature. Depending on the application, the tensile strength of nylon, although less than that of aluminum or steel, is often more than sufficient for low or fractional horsepower drive systems.
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