How to use the appearance method to identify different kinds of plastics ? Within a certain range, we can use the so-called "appearance method" to identify several commonly used plastics without any instruments and reagents, but only by eye, ear, nose, hand touch and so on. . The key to this approach is to capture the main external features of commonly used plastics. Let's take a look at it:
1. Polyethylene plastic: The color is milky white translucent body, the surface is waxy, the thick product has toughness, the thin product is soft, the hand feels slippery, the nose is sniffed, the smell is odorless, when it is beaten, the sound is soft and can float on the water surface. , put into boiling water will soften the emerald.
2. Polypropylene plastic: The color is milky white translucent body, the surface hardness is high, the hand touch has a lubricious feeling, but there is no greasy feeling of polyethylene, smelling with nose, odorless; floating on the water surface, and gathering more than the same volume Ethylene light; resistant to boiling water cooking without softening.
3. Polyvinyl chloride plastic: The rigid polyvinyl chloride product is hard and smooth, and it sounds dull when knocked. The soft PVC product looks like rubber, has a smooth surface and no waxy feeling. It smells with a nose and has a plasticizer smell; it sinks quickly in water; it is soft deformed when it is heated at 60 °C.
4. Polystyrene plastic: often has bright colors, crystal luster, hard surface and brittle texture, and it sounds crisp and crisp, like the metal crash sound of "falling whistle", it will sink in water, encounter 80 °C Hot water will soften,
5. Phenolic plastics: Most of them are opaque brown or black products. The surface is hard and brittle and fragile. When hitting, it is like a wooden board crashing sound. It is placed in the water and sinks quickly. It will not be deformed when placed in boiling water.
6. Phenolic plastics: These products are usually light in color, bright in gloss, and have a surface hardness better than phenolic plastics; they sink faster in water; they can resist heat and not deform.
7. Nitrocellulose plastic: The product looks like horny, with various transparent or opaque products; light weight, tough and elastic, with a camphor smell when rubbed; softened in boiling water.
8. Polyamide plastic: Mostly yellowish milky white, the appearance looks like horny, the surface is smooth, the texture is tough, the impact sound is not crisp, put into the water, the product sinks.
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