In the production of plastic toys, the identification method of plastics is usually identified by appearance and use, density test, softening point or melting point, burning test, and comprehensive identification method. The following commonly used methods are used for learning:
Appearance and use
To dissect an unknown polymer sample, the first thing is to look at the hand touch, to determine which category it belongs to in its appearance. If possible, understand its source and know as much as possible about the use;
Transparency and color
Crystalline → translucent / opaque (PP, PE, Nylon, POM, PET,
Amorphous → Transparent (PC, PMMA, GPPS, SAN, PPO)
Feel and mechanical properties
By hand, squeezing, tapping or bending the sample, you can sense the approximate strength and toughness of the material: you can use the nail scratches (or tools such as nails) to determine the hardness of the material. These can be used to initially identify the approximate type of material.
The method of burning test is very simple. Support a small piece of sample with a tweezers or a spatula and heat it directly with a flame. Generally, let the corner of the sample be close to the edge of the flame. For the sample that is easy to ignite, it can be distinguished first, and then placed in the Burning on the flame, sometimes moving away to determine whether the fire continues to burn.
The flammability of the material is related to the elements contained.
Combustible elements – non-flammable elements such as carbon, chlorine, sulfur – halogen, phosphorus, nitrogen, antimony, boron, etc.