How to distinguish between OPP film and PET film

Opp tape: Based on polypropylene film, it has the advantages of high tensile strength, light weight, non-toxic and tasteless, environmental protection and wide application range. OPP bottle: light weight, low cost, improved transparency and good heat resistance. It is suitable for hot filling. In recent years, two-way polypropylene (OPP) transparent bottles have become a substitute for PET bottles. PP is polypropylene It can be used as general structural parts, corrosion-resistant chemical equipment parts and heating electrical insulation parts. The identification of waste plastics mainly includes: plasticizing temperature identification method, combustion identification method, density identification method, plasticizing temperature identification method: plasticizing temperature ldpe110 115; HDPE140145; LLDPE125130:PP165170 PS145150; PVC150170;  Combustion identification method: product name, flame characteristics, combustion degree, appearance state, odor, PE, the upper part is yellow and the lower part is blue; Continuous combustion; Smokeless, melting and dripping; If paraffin burns, PP has the same flame color as PE; Ditto black smoke, melting and dripping; Such as oil smell, PS orange flame; Ditto: thick black smoke, softening and foaming; For example, the top of styrene flavored PVC is yellow, the bottom is green, the white smoke is extinguished from the fire, and the silk can be drawn when it becomes soft; Such as hydrogen chloride smell, pungent pet, yellow inside and blue outside, which can be broken into fragments continuously during combustion; Pungent odor appearance characteristics: PE feels greasy. When it is not colored, it is translucent, soft and tough. LLDPE feels softer, HDPE is slightly harder, PP is harder than PE and has better transparency. When it is not colored, it is white and translucent. The natural color of PVC is slightly yellow and transparent, and the transparency is better than PE and PP. Soft products are soft and tough. The hardness of hard products is higher than LDPE and lower than PP.