Simple identification method of plastic series--appearance identification

By observing the appearance of plastics, it is possible to initially identify a large category of plastic products: thermoplastics, thermosets or elastomers. Generally, thermoplastics have both crystalline and amorphous types. The appearance of the crystalline plastic is translucent, opaque or opaque, and it is transparent only in the state of the film, and the hardness is soft to horny. Amorphous is generally colorless, completely transparent when no additives are added, and hardness is harder than horny rubber (additives such as plasticizers are often added at this time). Thermoset plastics usually contain a fill that is impervious to the material and is transparent if it is free of filler. The elastomer has a rubbery feel and a certain stretch ratio.