Just from looking at the roll, it is very hard to tell what type of rubber is used on the tape. Look at the figure to the right, and this same picture can be used to describe every type of rubber-tape below. The key is to ask the supplier what type of rubber adhesive is used. Like acrylics, rubber adhesives can be divided into two subgroups: Natural and Synthetic
Mastic is a very tacky material with extreme elongation properties. Rubber mastic tape combines an ethylene propylene rubber backing with a conformable mastic layer.Rubber Mastic Tape 2228 integrates some of the best qualities of both materials−higher temperature rating, conformability, dielectric strength. It’s one tape that belongs in every toolkit.
PVC tape is one variety of electrical tape, as mentioned above. Functional and durable, PVC (polyvinyl chloride) tape is considered a ‘balanced’ plastic tape and is used in similar situations to vinyl electrical tape. However, PVC tape copes well with environmental factors and is often used for outdoor applications.