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How to identify plastic materials

Update:31-07-2018
Abst:

1。 PP=== 100% plastic, polypropylene Light and tough, e […]

1. PP=== 100% plastic, polypropylene
Light and tough, easy to process, good heat resistance, high impact strength at room temperature, high tensile strength, good rigidity, corrosion, difficult to paint, folding resistance up to millions of times, excellent electrical properties, large shrinkage. PP.PE.PA is soft and bendable, hand touched with hard waxy, slippery, tapped with soft horny sound, while PS.ABS.PC.PMMA, no ductility, knocking sound is crisper. PP burning phenomenon and PE is generally the same, there may be a small amount of black cockroaches. After the flame is extinguished, it smells like petroleum kerosene and is non-toxic.

2. LDPE===soft rubber, high pressure low density polyethylene
HDPE===hard soft rubber, low pressure high density polyethylene
VHDPE===Superhard soft rubber, ultra high pressure polyethylene
Light and tough. Easy to process, good heat resistance, low temperature toughness, hard and impervious, but good wearability, PE is flammable, can still be burned after fire. When burning, the flame is yellow and blue, and black mites are rare. Near the flame, the plastic has a phenomenon of melting and dripping, similar to the flow of a candle. After the flame is extinguished, there is a distinct smell of paraffin burning. The non-toxic PE.pp is less than water and floats in water. The majority of other plastics are larger than Water, sinking in water. Cosmetic plastic hose

3. PC=== bulletproof rubber, polycarbonate
Colorless and transparent, the impact strength is the first of the plastic, excellent electrical properties, anti-aging, small shrinkage, stable product size, PC burning phenomenon is close to PS but the burning speed is slow, it will slowly extinguish after the fire, the flame is yellow, with black cockroaches Carbon bundle, melting and foaming when burning, after the extinction is the flower and fruit smell.

4. PMMA===Plexiglas (Acrylene), polymethyl methacrylate
Excellent transparency, can be dyed into various colors, brittle and fragile, poor surface hardness, easy to wipe. Good resistance to leakage. PMMA and PS primary colors are transparent, but the combustion situation is different, PMMA has no carbon beam flying, and PS, when PMMA burns, the flame is light blue, the top is white, and it melts and bubbles when burned, giving off strong floral and fruity smell and rotten vegetable smell.

5. PS===hard rubber (ordinary hard rubber), polystyrene, transparent and brittle
HIPS===Unbreakable rubber, modified polystyrene, elasticity, toughness and high impact strength
ABS===ABS glue, super non-breaking glue, acrylonitrile-butadiene-styrene, easy to electroplating. High strength. Impact resistance, cold, grinding, corrosion.
SAN(AS)===transparent, styrene-acrylonitrile copolymer
EPS=== styrofoam, expanded polystyrene
The PS primary color is transparent, the HIPS primary color is milky white, and the ABS primary color is light ivory.
The difference between PS.HIPS.ABS is mainly: PS is brittle, HIPS and ABS have good toughness. When bending samples, PS is easy to be brittle, HIPS and ABS are difficult to break, and the bending part is white. PS primary color is Transparent color, HIPS primary color is milky white, ABS is light tooth color. PS.HIPS. and ABS are flammable. After taking the fire source, it can still be burned. The flame is yellow and has a thick black carbon beam with helium. Yi, PS carbon beam is slightly less, when burning, the plastic surface near the flame softens and does not drip, PS and HIPS surface will foam, ABS does not bubble and is coking, the smell of these kinds of plastics when extinguished The difference is very big, PS with styrene monomer smell, ABS emits a pungent smell, which has certain toxicity.

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