Rapid identification of plastic raw materials
LDPE ( Chinese name: Low-density high-voltage ridged ethylene )
Sensory identification: Soft to the touch, white and transparent, but generally transparent, often with tape and printed words, (Living: tape and printed words are inevitable, but they must be controlled, because these will affect the price in the market)
Identification of combustion: burning flame on the yellow under blue; burning smoke, there is the smell of paraffin, melting dripping, easy drawing.
EVA ( Chinese name: Polyethyl acetate ) :
Sensory identification: soft surface, Shenla toughness stronger than LDPE, feel sticky (but no glue surface); white transparent, high transparency, feel and feel very familiar with the PVC film should pay attention to distinguish.
Identification of combustion: When burned, the odor of paraffin wax is the same as that of LDPE. The smell of wax is slightly sour, and the burning flame is yellow and blue. When burning, it is smoke-free, melts and drops, and is easy to draw.
Note: This product is a kind of PE , the same price with LDPE , can be used for regeneration granulation, quality requirements and PE the same.
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PP (polypropylene):
Sensory identification: This product is white transparent and has a higher transparency than LDPE and sounds when rubbed.
Identification of combustion : When the flame is burned, the flame is yellow and blue, the smell is like oil, and the molten drips. When burning, there is no black smoke.
PET film (polyester)
Sensory identification: This product is white transparent, feel hard, sound when rubbing, appearance like PP
Identification of combustion: When burning, there is black smoke, and the flame has a phenomenon of flashover. After burning, the surface of the material is black carbonized, and the finger rubs the black carbide after combustion. The carbides are powdery.
PVC film (polyethylene)
Sensory identification: looks very similar to EVA but elastic.
Identification of combustion: Black smoke when burning, away from the fire, the burning surface is black, no melting dripping phenomenon.
Nylon copolymer ( LDPE + nylon):
Sensory identification: Appearance like PP , very high transparency, loud sound when rubbing PP
Identification of combustion: black smoke when burning, flame jumping phenomenon, brown carbonization of the combustion surface
PE+PET composite film
Sensory identification: The material surface is smooth and white and transparent.
Identification of combustion: combustion like PET , no melting dripping phenomenon, burning carbon black surface. There is black smoke, there is a phenomenon of flashover, with the paraffin odor of PE .
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