How can you tell the difference between high-temperature PET and low-temperature PET? This is a common question that many people have. Today, we’ve gathered some expert insights from China Packaging Bottle Network in a Q&A format to help you better understand this topic.
Q: For recycled materials, can they be identified with the naked eye or using simple methods?
A: If you have a melting point tester, it’s very easy to determine. By the way, a melting point tester costs around 20,000 yuan and is portable—like a briefcase. Without one, you’re missing out on an essential tool for identifying PET quality.
When burning, if the wire stretches and then breaks into a thread, and that thread can be wound into several coils, it indicates a normal melting point. The more coils you get, the higher the melting point. However, I must admit, I don’t have enough experience to define exactly how many coils are considered acceptable.
Additionally, if the material melts quickly when burned, it likely has a lower melting point. Dark, burnt flakes also suggest a lower melting point. If you smell something overly sweet, that could be another sign of a lower melting point. These are things I’ve heard from older professionals in the industry.
Here are a few practical tips:
1. **Smell test**: PET has a distinct, aromatic scent when burned. If it smells pungent or unpleasant, it may contain other additives. For example, bottles with SEBS components should not be used.
2. **Burnt appearance**: If the burnt area shows too much black residue or oil droplets, it might indicate an abnormal melting point, which is often seen in PET film.
3. **Pulling the wire**: When burning, pull the melted wire from the flame. If the wire isn’t long and doesn’t form a tight coil when broken, it suggests a lower melting point. The more the wire can be coiled, the higher the melting point.
In general, for bottles, there shouldn’t be major issues, but the most important thing is to check whether PVC is present, as it can be harmful to PET.
Other observations: When burning, stretch the wire and see how long it is before breaking. If the broken end doesn’t form a tight coil, it may indicate a lower melting point. Again, I don’t have the exact standard for how many coils are acceptable, but the more you can coil, the better.
In summary, while some methods are based on experience, having the right tools like a melting point tester can make the process much easier and more accurate.
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