Polytetrafluoroethylene coated glass fabric

One can think of the PTFE dispersion coating process as impregnation of fibrous or porous materials such as glass fiber, woven glass cloth, and polyaramide fibers and fabrics. The composite product combines the properties of PTFE and substrate. The polytetrafluoroethylene coated or impregnated products are characterized by a number of common attributes, Table 5.9. 

The article, which is usually in the form of an impregnated fabric, is laid-up on a mold or a base plate (Figure 6.65 and 6.66) which defines the surface shape of the article. A release agent is applied to the mold surface to prevent adhesion of the part to the mold. A release film, such as a fluoropol5mier typically a fluorinated ethylene propylene copol5mier or a glass fabric coated with polytetrafluoroethylene is often the next layer. Other films such as nylon or polyester can be used where release is less demanding such as lower cure temperature resins. 

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