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How to distinguish the material of food plastic packaging bag, please point out in detail; thank you

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if you are not a professional, you can see a sign of “△”. The numbers inside represent the main components of plastic packaging. If there is no label, there is no way

the recycling mark of plastic packaging products consists of graphics, plastic code and corresponding abbreviation code The figure is an equilateral triangle with three arrows, representing that the material category is plastic; The plastic code is the number combined with 0 and Arabic numerals sequence number, which is located in the center of the figure and represents different plastics respectively; The plastic abbreviation code is located below the figure
Plastic name code and corresponding abbreviation code
polyester 01 pet
high density polyethylene 02 HDPE
polyvinyl chloride 03 PVC
low density polyethylene 04 LDPE
polypropylene 05 PP
polystyrene 06 ps
other plastic codes 07 others

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