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How can you tell the difference between high-temperature PET and low-temperature PET? This is a question many people are curious about. Today, we’ve gathered some expert insights from China Bottle Bottle Network in a Q&A format to help you better understand the distinction.
A: Can recycled materials be identified with the naked eye or simple methods?
B: If you have a melting point tester, it’s quite easy. By the way, these devices usually cost around 20,000 yuan and are portable, like a briefcase. Without such tools, it's hard to accurately determine the quality of PET bottles.
When burning, if you pull out the wire and stretch it, then break it—check how it behaves. If the broken wire can be rolled into several small circles, it likely has a normal melting point, and the more rolls, the higher the melting point. I’m not an expert, so I can’t give exact numbers, but experimenting on your own is the best way to learn.
Additionally, during burning, if the material melts quickly, it suggests a lower melting point. If the burned pieces turn very black, that’s another sign of a low melting point. Also, if the smell is sweet, it might indicate a lower melting point.
1. First, smell the material. The scent of PET is different from regular plastic. When burned with a lighter, it gives off a pleasant, aromatic smell. If it smells pungent or strange, it may contain other additives. For example, some bottles with SEBS shouldn't be used.
2. Look at the burned area. If there’s a lot of black residue or oil droplets appearing quickly, it often means the melting point isn’t normal. This is commonly seen in PET film.
3. Try drawing the fiber. When burning with a lighter, pull the wire. If it doesn’t stretch long and breaks easily, check the break point. If the wire doesn’t roll into a tight circle, it could mean a high melting point. However, for most bottles, this isn’t a big issue—what matters most is checking for PVC, which is dangerous for PET.
Other observations: When burning, pulling the wire and breaking it, if the wire can be rolled into several small circles, it indicates a normal melting point. Again, without enough experience, I can’t define exact standards. But if the material melts quickly, turns very black, or smells sweet, it may be low temperature PET. It's always best to test and observe carefully.