Identification of the advantages and disadvantages of packing materials

The domestic production of recycled materials is more difficult to distinguish, because many factories waste either impure (that is, there are miscellaneous materials, such as ABS, etc.), or PE content is very heavy (because PE can reduce the cost of PP). The foreign-generated recycled materials can basically be assured, because either they do not want to do fake, but when they decide to do it, they can kill you, of course, here is a common experience.
1. Color: Anything with transparency is better than nothing, no matter what color it is.
2. Gloss: Gloss is better than no gloss, the so-called gloss is the material itself, like human skin color, is the color of the material surface.
3. Odor: Ignited with a lighter, blown off after 3 seconds, smelled its smell of smoke, and distinguished the difference between it and the new material PP, which should be noted that some colors of the toner emitted a large smell, would mask PP ( Part of the taste of PP recycled material, don't worry, there are Other ways.
4. Drawing: After the fire is extinguished, quickly contact the melt with an iron object, and then quickly pull it open to see if the forming of the wire is uniform. The uniform material is good material. After several pulls, the wires are overlapped. Pull it open again to see if it has any elasticity. Can it be pulled open again and again. It is good to break without breaking or breaking apart.
5. If you can't confirm the above, please burn it again. In the process of burning, you can quickly take off black smoke or melt quickly. It's not good material.
6. Bite with teeth: first try the new material PP (PP recycled material) strength, and then compare it, if relatively soft, absolutely add PE inside.
7. Look at the section of the incision: The section is rough and unsharp, and the material quality is poor.
8. Float: As long as there is submerged, poor, if the above is not sure, or uncertain, it is only test machine. My personal opinion is that whether it is good or bad, it must be certified by machine, because it is the most secure. Other materials can also be applied to the above, of course, they have to understand the nature of the new material first.