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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 put together a Q&A session from experts at China Bottle Bottle Network to help you better understand this topic.
A: Can you tell the difference between recycled materials just by looking or using simple methods?
B: If you have a melting point tester, it’s very easy. By the way, a melting point tester costs around 20,000 yuan and is portable like a briefcase. Without such equipment, it's hard to accurately determine the quality of PET bottles.
When burning, if you pull out a wire and stretch it, then break it, the way it breaks can indicate the melting point. If the broken wire can be rolled into several loops, it suggests a normal melting point, and the more loops, the higher the melting point. However, I’m not an expert, so I can’t give exact numbers. It’s best to experiment yourself for better results.
Another sign is how quickly it melts during ignition. If it melts fast, it likely has a low melting point. Also, if the burned pieces turn very black, that’s another indicator of low melting point. A sweet smell when burning might also suggest a lower melting point.
Here are some additional tips:
1. First, smell it. The smell of PET is different from regular plastic. When you burn it with a lighter, it should have a pleasant, aromatic scent. If it smells pungent or chemical-like, it may contain other additives. For example, some bottles with SEBS shouldn't be used.
2. Look at the burned part. If it turns black quickly or produces oil droplets, it may not be normal PET. This is often seen in PET films.
3. Try drawing the melted thread. When you burn it with a lighter and pull the wire, see how long the strand stretches. If it doesn’t stretch much and breaks without forming a small loop, it may indicate a high melting point. For bottles, this isn’t usually a big issue, but it helps identify if there’s any PVC contamination, which is dangerous for PET.
In summary, burning is one of the simplest ways to test. Pulling the wire after ignition and observing how it breaks can give clues about the melting point. If it rolls into multiple loops, it's likely good. If it burns too fast or smells sweet, it could be low quality. Always make sure to test safely and carefully.