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How to distinguish the good and bad of plastic products

Release time:

2021-09-15

How to distinguish the good and bad of plastic products

1. The formation of raw materials for plastic products:

1. The commonly used synthetic resins for general plastics in plastic products include polyethylene, polypropylene, polystyrene, polyvinyl chloride, modified polystyrene and polycarbonate, etc.

2. Fillers can improve the strength and heat resistance of plastics and reduce costs. Commonly used are wood powder, plant fibers, glass fibers, diatomaceous earth, asbestos, carbon black, etc. Plasticizers can increase the plasticity and softness of plastics , commonly used phthalates.

3. The stabilizer is to prevent the synthetic resin from being decomposed and destroyed by the action of light and heat. Commonly used stearate, epoxy resin, etc.

4. Colorants make plastics have various colors, and organic dyes and inorganic pigments are commonly used.

5. The lubricant prevents the plastic from sticking to the mold and makes the plastic surface smooth and beautiful. Commonly used metal salts such as calcium and magnesium stearic acid.

Second, how to identify plastic products:

1. Tactile sense: touch the edge of the product, there is no feeling of stabbed hands, the edge is clean and mostly the mold is better, and the flash repair is also better. It feels very prickly to the touch, and the edges are very rough, mostly because the mold is poor.

2. Smell: It smells very light, but it has a slight plastic smell, which is mostly a better quality product. Those with a strong smell of plastic are mostly products of slightly lower quality, and those with a strong smell of plastic and a pungent smell are mostly of poor quality.

3. Vision: Transparent and colorless products look good in transparency and no impurities, such as fresh-keeping bags, cups, lunch boxes, and fresh-keeping boxes. Items that are not very transparent or appear to have a lot of impurities are of slightly lower quality. Such as sorting boxes, basins, hangers, stools, and opaque products are mostly products with poorer products, such as trash cans, trash can liner, and trash bags.

3. How to choose plastic products:

1. Cling film The household cling film on the market is mainly polyethylene plastic film. When buying, look for the signs of "PE", "PVC-free", "Can be used for microwave heating", and white smoke is emitted when burning with fire. Such products are safe.

2. Plastic bags should be purchased in large shopping malls and reputable supermarkets. There are also some simple methods that can roughly identify plastic bags with good safety, feel smooth to the touch, and have a crisp sound when shaking. In case of fire, it is flammable and emits white smoke. When it enters water, it will surface. It has no odor and no color.

3. Another kind of fresh-keeping film is polyvinyl chloride plastic film, which is characterized by good transparency, not easy to break, strong adhesion, low price, and obvious burnt black marks when burned with fire. This kind of fresh-keeping film is added during processing. A large amount of plasticizer phthalates, which will release harmful components when exposed to heat and oil, are only suitable for refrigeration and preservation of vegetables and fruits.