It is not easy to identify intuitively. The following method is simple and easy to implement: Tear the film and observe the fracture. If there is a sawtooth shape, it is generally a composite film; if the cross section is relatively smooth, it is a single-layer film. Wipe the side of the film with ink on the rougher surface for a few times. If the ink falls off, it is generally a single-layer film; if the ink cannot be wiped off half, it is a composite film. Ignite the film, if there is no characteristic odor, or there is a wholesale Plastic Shaker for sale mixed odor, it is either a composite film; either a copolymer or a blend.
      Identification of plastic films There are many types of plastic films, especially the port materials are more complex, and the identification of materials is very important. Easy to stretch film PE, PP (unstretched), soft PVC is not easy to stretch; heat and melt, heat shrinkage; stretch PP, stretch PVC, polyvinylidene chloride, PS is not easy to stretch; heat and melt; heat shrinkage Polyester and nylon are not easy to stretch; heat does not melt - cellophane to take a film to test its stretchability; another film sample, slowly approach the flame, observe its heat shrinkage and whether it melts.

 Heating identification method Put a small amount of sample into a glass test tube, heat the test tube slowly on the flame, and when the sample is decomposed, take a piece of soaked precision PH test paper and place it at the mouth of the test tube, and measure the pH value of the decomposed gas. PH=0.5 -4.0 Chlorine, bromine-containing polymers, polyvinyl esters, phenolic resins, polyurethane elastomers, fluoropolymers, polysulfides. PH=5.0-5.5 Polyolefins, polyvinyl alcohol, polyvinyl ether, polymethacrylic acid Ester, polyoxymethylene, polycarbonate, linear polyurethane, cross-linked polyurethane. PH=8.0-9.5 Nylon, ABS, acrylic Note: Modified materials will affect identification; halogen flame retardants will also affect identification.