PTFE biaxially stretched film can easily stretch out fibrils and nodes at a lower temperature (35°C), but when the strain reaches 25%, the base tape breaks and the tensile stress decreases rapidly; Stretching When the temperature is 90°C, the base tape breaks when the strain reaches 100%; when the tensile temperature is above 140°C, the base tape does not break even when the strain reaches 300%.
In actual processing of ptfe biaxially oriented film, the transverse expansion is usually around 170°C.
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