1, surface discrimination method: First look at the cross-section or cross-section, pan-blue multi-pvc sheet, because the pvc formula added Ultramarine and scattered violet, phosphor and other color agents, there is no pan-blue for the pet sheet, look at The surface of the sheet, pvc sheets are mostly calendering process, the surface of the sheet has many water flow rhyolite, but these two kinds of naked eye judgment methods have limitations, because pvc, sheet can do cost color, cross-section color close to pet, Pvc can also be produced by an extrusion process. No watermarks can be made on the surface, and all can't be successfully identified with 100%. The following identification method is required.

2, folding identification method: the two materials each cut a small piece, respectively, folded, because the pvc sheet material molecular composition and rolling production process of the double constraints, making pvc sheets are mostly white, all folded with white marks is Often pvc sheet, white marks are not obvious or basically look good is pet. However, this method also fails, because the change in the production of pvc formula can make the crease is no longer obvious, it is better to use the Japanese import 513 is better than the Wanda m61, the whitening will be significantly weakened, so I have other judgments More accurate judgments.

3, the combustion method: on the basis of the first method to be upgraded to identify, starting from the burning state to distinguish. Cut a piece of material with a lighter to ignite, burning smoke, once the lighter extinguished, extinguished, the burning edge of the black crystal is pvc sheet, because the pvc sheet is a polychlorinated molecule, with flame retardant, leave the fire source will Extinguished, pet sheet also burns under the flame, it is very light and smokeless. After the fire source is removed, it still burns. The burning edge is brighter and the color crystal is less. It can be judged that this is the pet sheet, the pet sheet is the polyester, Lipids are easily degradable and naturally flammable.

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