Use of plastic materials:
1--PET: polyethylene terephthalate
Commonly used in mineral water bottles, carbonated beverage bottles and other beverage containers. The temperature reaches 70 ℃ easily deformed, and there are harmful substances melted.
2 - HDPE: High Density Polyethylene
Commonly used in white medicine bottles, cleaning products, bath products. Don't use it for water cups, or as storage containers for other items.
3--PVC: polyvinyl chloride
Commonly used in raincoats, building materials, plastic film, plastic boxes and so on. Excellent plasticity, cheap, so the use of very common, heat-resistant to 81 ℃ when the peak, high temperature is prone to harmful substances, rarely used for food packaging. Difficult to clean, easy to residue, do not recycle.
4 -- PE: polyethylene
Common in plastic wrap, plastic film and so on. Harmful substances are produced at high temperatures, and when toxic substances enter the body with food, they may cause breast cancer, birth defects in newborns and other diseases.
5--PP: polypropylene
Common in soy milk bottles, yogurt bottles, microwave lunch boxes, melting point up to 167 ℃, is the only plastic products can be put into the microwave oven, can be carefully cleaned and reused. It is important to note that some microwaveable lunch boxes, the box body is made of No. 5 PP, but the lid is made of No. 1 PET, because PET can not withstand high temperatures, so it can not be put into the microwave oven together with the box body.
6--PS: Polystyrene
Commonly used in bowl of instant noodle boxes, fast food boxes. It should not be put in the microwave to avoid the release of harmful chemicals due to high temperature. Avoid packing hot food in fast food containers, and don't cook instant noodles in a bowl in a microwave oven.
7 -- PC: other categories
Commonly found in water bottles, space cups, milk bottles. Department stores often use these material mugs as giveaways. However, water cups made of this material can easily release the toxic substance Bisphenol A, which is harmful to the human body. In addition, do not heat when using this kind of water cup, avoid exposure to strong sunlight.
Extended information
Plastics are monomers as raw materials, through the polymerization or polycondensation reaction polymerization of polymer compounds (macromolecules), commonly known as plastics (plastics) or resins (resins), can be free to change the composition and shape style, by synthetic resins and fillers, Plasticizers, stabilizers, lubricants, colors and other additives.
The main component of plastic is resin. The term resin was originally named after the lipids secreted by plants and animals, such as rosin and wormwood, etc. Resin is a polymer compound that has not yet been mixed with various additives. Resin accounts for about 40% to 100% of the total weight of plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins and contain no or few additives, such as plexiglass and polystyrene.
Reference? Baidu encyclopedia-plastics