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Why is glass fiber added to PA66 material?

Pure PA66 is too soft, too prone to deformation, dimensionally unstable, and not heat resistant. Glass fiber is added to 'reinforce and control shape,' especially if you are making nylon screws or fasteners, glass fiber must be added to make it usable.

Plastic Expansion Plugs: Unassuming yet Powerful Fastening Tools

In scenarios such as building decoration, furniture installation, or equipment fixing, there is a seemingly unremarkable yet crucial small item — the plastic expansion plug. This cylindrical piece made of polymer materials transforms loose connections into stable fastenings through an ingenious physical principle, becoming an indispensable hardware accessory in modern life.