Why can PET high-temperature tape withstand high temperatures?

High-temperature tape is more resistant to high temperatures than ordinary tape, pet high-temperature tape has no residual adhesive after baking, no warping, no shedding, and high corrosion resistance, high-temperature and low-temperature performance, can be more to achieve high insulation and moisture resistance. However, it has high-temperature performance is undoubtedly the primary selling point.
Pet high-temperature tape in the thermosetting rigid polymer due to chain separation leads to poor flexibility. The cross-linked three-dimensional network structure is less prone to deformation under tension and can withstand higher loads. Thermoplastic polymers are not cross-linked due to the separation of interesting points. Under external forces, the chains deform considerably and the relative points of interest move slowly, thus causing creep. In this case, the aspect ratio is higher than that of thermoset polymers, but the loads it can withstand are not as high.

Since high-temperature tape elastomer materials contain many flexible parts, they are susceptible to reversible deformation under external forces. Creep of thermoplastics and elastic deformation of elastomers under certain shear stresses reduce the stress concentration of the specimen to a certain level and reduce the linear force on the edges of the specimen joints. Low molecular weight thermoplastic resins and polyethylene polymer adhesives have a high deformation rate under external forces and do not rupture, but can withstand lower loads.
High temperature tapes that can be used for lap joints have a bond thickness that directly affects the shear strength of the joint. In general, an increase in bond thickness results in a decrease in the shear strength of the joint. However, the thinner the adhesive, the better. A bonding layer that is too thin tends to lack adhesive and becomes a defect in the bonding film. The thickness of the adhesive depends on the shape of the splice, the carrier and the nature of the adhesive.
Pet high temperature tapes are double-sided adhesive tapes for use in high-temperature working environments and can generally withstand temperatures from 120 °C to 260 °C. pet high temperature tapes play an important role in the fixing of electronic parts and printed circuit boards as well as in high-temperature handling and covering. For example, in the electronics industry, pet high temperature tape can be used to insulate the body of motorized electrical equipment when the motor heats up, and can be used to protect other components when soldering.

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