How to identify the good materials in recycled materials easily?

How to identify the good materials in the recycled waste plastics in daily life?

What kind of recycled plastics are good materials? What's the difference between recycled plastics and new materials? First of all, from the aspect of appearance:

1. The gloss of recycled plastics is poor, the surface of particles is dim, the size is uneven, there are impurities, generally with color or gray;

2. The new material has good gloss, smooth particle surface, uniform size, no impurities, colorless or milky white; The color of the new material is bright, but the color of the old material is dim.

For plastic film, the plastic film to the sun to see whether there are stars, usually some are recycled, basically no new material（ Because the color of recycled materials is different, the handle is different, and there are many impurities, the color is not good, and the natural color is less.)

How to identify good materials? What's good stuff? We can make a more detailed distinction from the following seven aspects:

1. Color: the transparent is better than the opaque, no matter what color it is.

2. Glossiness: the glossy one is better than the one without glossiness, which is the color of the material surface.

In terms of physical and mechanical properties, the recycled materials are made of waste products. After being exposed to the sun and wind, the plastic surface has been aged and degraded. After many times of high-temperature processing, melting and plasticizing, under the action of light, oxygen and high temperature, part of the polymer is oxidized, and the macromolecular chain is broken and degraded, resulting in the decline of physical and mechanical properties. The more times of regeneration, the more severe the performance decline.

3. Wire drawing: (the wire drawing of CaCO is definitely not good, and the reinforced wire can't be pulled out) after blowing out the fire, use an iron object to quickly contact the melt body, and then pull it out quickly to see if the wire forming is uniform. If it is uniform, it is good material. After pulling several times, overlap the wire and pull it out again to see if it is elastic and can be pulled out again, What is not broken or broken after a certain distance is good material.

4. Ignition: (observe whether the color of the flame is smoky, whether it contains off fire combustion or no combustion at all);

5. Smell: (all kinds of plastics smell different, including flame retardant, etc.);

6. If you can't confirm the above, please use fire again. In the process of burning, black smoke or melting body drops rapidly. It's not good material.

7. Floating: as long as there is submergence, it is bad. If you are not sure about the above, or you can't make up your mind, you have to test the aircraft.