How to identify high quality PET plastic materials?

PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. It is resistant to creep, fatigue and friction. It has low abrasion and high hardness. It has the highest toughness in thermoplastics. It has good electrical insulation properties and is less affected by temperature, but it has poor corona resistance. Non-toxic, weather-resistant, chemical-resistant, and hygroscopic, and drying before molding is a must. It is resistant to weak acids and organic solvents, but it is not soaked in heat-resistant water and is not resistant to alkali.

By learning these tricks, you can easily identify high quality PET plastic materials.

The PET resin has a high glass transition temperature, a slow crystallization rate, a long molding cycle, a long molding cycle, a large molding shrinkage ratio, a poor dimensional stability, a brittleness in crystallization, and low heat resistance. Through the improvement of nucleating agent and crystallization agent and glass fiber reinforcement, in addition to the properties of PBT, PET has the following PET plastic identification methods:

1. First taste, PET tastes different from ordinary plastic, burn it with a lighter, and then smell very aromatic and comfortable (just burn a bottle to smell). If PET contains other ingredients, the taste is very pungent. . There is a bottle containing SEBS ingredients that cannot be used.

2, drawing, when burning, pull the wire on the lighter, see the length of the wire is not long, then pull the pulled wire off, see the break point in the middle, the wire is not rolled into a small circle, the more the volume More indicates that the melting point is high.

3, look at the burnt part, if the distribution of black or oil drops quickly, most of the melting point is not normal, which is often found in PET film.

However, if it is a bottle, it should not be a big problem. The most critical point is to distinguish whether it contains PVC, which is a fatal injury to PET. First sample more, then tiling in a sunny place, PVC is light blue in the sun. If there is a white crease in the fold. The above is the naked eye identification, the accuracy is limited, mainly depends on experience.

There is also a more practical way to buy an oven to adjust the temperature to 250 degrees and bake it for half an hour. If it contains PVC, there will be a lot of yellow spots on the surface; if the melting point is not enough, it will melt quickly.

In fact, PET also includes many varieties, such as PET smashed film from foreign factories, slurry blocks, and film rolls less than 30 cm in length, all of which have different customer groups.

The identification of these goods is strongly required to be tested with an oven. In particular, PET reels are a very scarce source of supply throughout the market, generally 80 to 120 cm in length, and high-quality PET plastic materials with a thickness of 3-5 filaments are also very high (white transparent).