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Simple identification method for plastic raw materials

1. Density testing usually adopts the isodensity method. In a liquid of known density, the density of the plastic can be calculated by measuring the density of the liquid when the plastic sample is suspended. For example, the density of industrial alcohol is 0.8, the density of sodium chloride is 22, the density of water is 1, the density of zinc chloride is 63, and the density of magnesium chloride is 33. The combustion test is a simple identification method.

2. Plastics can be roughly divided into two categories: thermoplastic and thermosetting. Thermoplastic plastics are further divided into general purpose plastics, engineering plastics and advanced engineering plastics. There are many types of plastic raw materials on the market, and the number may exceed hundreds. There are many ways to distinguish types of plastic. Normally, experienced professionals can make preliminary judgments based on observations and hand feeling.

3. Plastics are synthetic polymer compounds {polymers}, which can also be called polymers or macromolecules. They are also commonly known as plastics or resins, and can freely change their shapes and styles. It is a material polymerized using monomer raw materials through synthesis or condensation reactions. It consists of synthetic resin and additives such as fillers, plasticizers, stabilizers, lubricants, pigments, etc.

4. Several plastic materials commonly used in electronic products and their structural design considerations [ABS styrene resin] ABS materials have excellent impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties, and good fluidity. The appearance is opaque ivory colored granules, and the products can be colored into colorful colors and have good surface luster. The density is about 05 g/cm, and the molding shrinkage rate is about 0.4%-0.6%.

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