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How to Apply Butyl Weather Stripping

3M also makes an electrical tape made of silicone rubber for applications where Class “H” (180°C/356°F) temperatures are encountered i.e., silicone rubber cables.
 

Wrap and Stretch: Begin wrapping the tape around the object or area that needs repair. Stretch it slightly as you wrap to activate the self-fusing properties.

As described in the article “How Polyimide Tapes are Made“, tapes are composed of two distinct layers, each of which is critical to the properties of the final product. The first layer is the backing material, and whether this is polyimide film (the generic verison of DuPont’s Kapton), polyvinyl chloride (PVC), Polyethylene terephthalate (PET), or some other plastic, cloth or paper material, this layer is selected to provide half of the tape’s final properties. The other half is determined by the adhesive layer applied to this backing layer.