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Structural Layer
The function of the outer structural layer is to provide the backbone for the pressure garment and stop the balloon and dampening layers from infinite expansion. The pressure in the garment is not excessively high, but selecting a high strength material would allow for a thinner layer.
To form the pressure garment, it became important to choose a film material that can be combined with the EVOH balloon layer. Polyesters are stiff, strong, and lightweight, have good barrier properties and can be made into a fabric. Polyester was considered as the material for the structural layer until the idea was proposed to incorporate the dampening layer (formerly part of the TMG) into the pressure garment. With this molded silicone elastomeric material as part of the pressure garment, both EVOH and PI films could then be used by adhering them to the molded silicone elastomer. Thus, the polyester fiber would then not be required.

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