How to choose high quality PET ? PET is a milky white o […]
How to choose high quality PET ?
PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. Good creep resistance, fatigue resistance, friction resistance, low wear and high hardness, with the largest toughness in thermoplastic plastics; Good electrical insulation performance, less affected by temperature, but poor corona resistance. Non-toxic, weather resistance, good stability of anti-chemical drugs, high hygroscopicity, drying before molding is necessary. Resistant to weak acids and organic solvents, but not resistant to water immersion, alkali resistance.
PET resin glass temperature is high, slow crystallization rate, long molding cycle, long molding cycle, large molding shrinkage, poor dimensional stability, crystallization of the molding is brittle, low heat resistance.
Through the improvement of nucleating agent and crystallizer and glass fiber reinforcement, in addition to the PBT properties of PET, there are the following PET plastic identification methods:
1.Smell the taste, the PET taste is different from the general plastic, with a lighter to burn, and then will smell a very fragrant and comfortable taste (just burn a bottle to smell), if the PET contains other ingredients, the taste is very pungent. There's a bottle with SEBS in it that can't be used.
2.Wire drawing, when burning, pull the wire on the lighter to see whether the wire is long or not, and then pull the wire out of the broken point, see the middle of the break point, whether the wire is rolled into a small circle, the more the volume means that the melting point is high.
3.Look at the burning part, if it is too black or the oil drops are fast, most of the melting point is not normal, which is often seen in the PET film.
Whether it is a PET honey bottle or a Small Plastic Juice Bottles, it is a direct food, so it must be selected.