LDPE (Chinese name: low density high pressure polyethylene):
Sensory identification: Soft touch: white and transparent, but the transparency is common, often with tape and printed words. (Note: Tape and printed words are inevitable, but their content must be controlled, as these will affect the price on the market)
Combustion identification: yellow to blue on the burning flame; smokeless when burning, with the smell of paraffin, melting dripping, easy to draw.
EVA (Chinese name: Polyethylene? Ethyl acetate):
Sensory identification: the surface is soft; the tensile toughness is stronger than LDPE, and the feel is sticky (but the surface is non-adhesive); white and transparent, high transparency, the look and feel are very similar to PVC film, and should be distinguished.
Combustion identification: when burning, it has the same smell of paraffin as LDPE, slightly sour; the burning flame is yellow and blue; when burning, it is smokeless. Melt dripping, easy to draw. Note: This product is one of the types of PE, the price is the same as LDPE, it can be used for regenerative granulation, and the quality requirements are the same as PE.
PP (polypropylene):
Sensory identification: This product is white and transparent compared with LDPE, and has a loud sound when rubbed.
Combustion identification: the flame is yellow and blue when burning, smells like oil, melts and drops, and there is no black smoke when burning.
PET film (polyester)
Sensory identification: This product is white and transparent, with a hard feel and a sound when rubbed. It looks like PP.
Combustion identification: There is black smoke during the combustion, and the flame has a phenomenon of flashover. After the combustion, the surface of the material is black carbonized, and the finger rubs the black carbonized material after the combustion.
PVC film (polyvinyl chloride)
Sensory identification: the appearance is very similar to EVA but flexible.
Combustion identification: Black smoke is emitted during combustion, and it is extinguished when it is away from the fire. The burning surface is black and there is no melting dripping.
Nylon copolymer (LDPE + nylon):
Sensory identification: The perception of this product is very similar to LDPE.
Combustion identification: yellow to blue on the combustion flame, no smoke when burning, paraffin odor, melt dripping, but easy to draw but different from LDPE, it smells of burning hair when burning, and it is light yellow after burning Note: Nylon copolymer can not be used for regenerative granulation, it must be strictly distinguished from LDPE and the content in large parts must be strictly controlled.
Sensory identification of PE + PP copolymer material: Compared with LDPE, the transparency of this product is much higher than that of LDPE. There is no difference between the feel and LDPE. The tear test is very similar to PP film.
Combustion identification: When this product burns, the flame is all yellow, melted and dripping, no black smoke, smell like petroleum.
Sensory identification of PP + PET copolymer material: Appearance is similar to PP, with extremely high transparency, the sound is greater than PP when rubbed.
Combustion identification: There is black smoke during combustion, the flame jumps, and the surface of the combustion is black carbonized.
Sensory identification of PE + PET composite film: the surface of the material is smooth and not smooth, white and transparent.
Combustion identification: burning like PET, no melting dripping phenomenon, black carbonization on the combustion surface, black smoke, flashover phenomenon, with the paraffin smell of PE.
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