For recycled materials, high temperature PET and low temperature PET can be separated with the naked eye or by some simple methods, such as using a melting point tester. Ignition combustion, wire drawing, elongated after the wire is pulled off, if the broken wire can be rolled into several volumes, indicating that the melting point is normal, the more the higher.
In addition, during the ignition, if the melting is very fast, it means that the melting point is low, and the burned bottle flake becomes particularly black, indicating that the melting point is also low, and the taste smells particularly sweet, it may also be low.
1, smell the taste first,PET taste is different from general plastic. Burn it with a lighter, and it will smell very fragrant and pleasant (just burn a bottle and smell it), and if the PET contains other ingredients, it will smell very pungent. You can't use a bottle with SEBS in it.
2, look at the burned part, if it is too black or the oil drops quickly, most of the melting point is abnormal, which is often in PET film.
3, wire drawing, when burning on the lighter to pull the wire, see the wire is not long, and then pull out the wire break, see the middle of the break point, the wire is not rolled into a small circle, the more the volume indicates the melting point is high. But in general, if it's a bottle, there shouldn't be any big problems. The most important point! Is to identify whether it contains pvc, which is the fatal injury of PET.