How is plastic classified, first look at the appearance, ABS color is ivory, that is, beige, the surface gloss is good, PP is transparent milky white, a little waxy, PA color is yellowish or milky translucent, PET is transparent material, high transparency. You can basically judge these materials from their appearance. Secondly, with the density method, four kinds of put into the water, floating on the surface of the water is PP, the density is only 0.91, sinking in the bottom is PET, the density is 1.3, in the middle is ABS and PA, and then use the combustion method, ABS combustion has black smoke, PA for blue smoke.

Simply put:

The most essential difference between plastic and rubber is that plastic deformation occurs when plastic deformation, and rubber is elastic deformation. In other words, plastic is not easy to return to its original state after deformation, and rubber is relatively much easier. The elasticity of plastic is very small, usually less than 100%, while rubber can reach 1000% or more. Plastic in the molding of the vast majority of the molding process is completed the product process is completed; After the rubber molding process is completed, the vulcanization process is required.

Plastic and rubber belong to the same polymer material, mainly composed of carbon and hydrogen two atoms, and some contain a small amount of oxygen, nitrogen, chlorine, silicon, fluorine, sulfur and other atoms, its special performance, special use. At room temperature, plastic is solid, very hard, can not stretch deformation. The rubber hardness is not high, elastic, can be stretched longer, stop stretching and can return to the original state. This is due to their different molecular structures. Another difference is that plastic can be recycled and reused many times, while rubber can not be recycled directly, can only be processed into recycled rubber, and then available. The shape of plastic at more than 100 degrees to 200 degrees is similar to that of rubber at 60 to 100 degrees. Plastic does not include rubber.

Complicated to say:

General industrial double-sided adhesive, can be divided into two categories: acrylic adhesive and rubber adhesive. And these two categories, and can be divided into two types of substrate and no substrate (substrate: add a layer of cotton in the glue, strengthen the double-sided tape itself glue amount and strength, no substrate: pure gum, to ensure the transparency of double-sided tape). Because the main body of the rubber rubber system is CR, it is used for rubber products, and it is easy to react with the vulcanization system of rubber and turn yellow. Therefore, the lighter color rubber products are all made of double-sided adhesive with a substrate in the acrylic adhesive system (the same kind of double-sided adhesive, whether there is a substrate or no substrate, is distinguished by its own gum thickness.