Overview of plastic materials (PET/PS/PP/PVC...)



Overview of plastic materials (PET/PS/PP/PVC...)
 
No. 1: PET (polyethylene terephthalate)
The container made of this material is a common plastic bottle filled with soda water, also known as "Boute bottle".
Common mineral water bottles, carbonated beverage bottles, etc. Heat resistant to 70 ° C is easy to deform, and there are substances harmful to the human body. After 10 months of plastic products, the carcinogen DEHP may be released. Do not put in the sun in the car; do not pack alcohol, oil and other substances.


No. 2: HDPE (High Density Polyethylene)

Containers for detergents, shampoos, body washes, cooking oils, pesticides, etc. are mostly made of HDPE. Most of the containers are opaque and feel like wax.

Common white medicine bottles, cleaning products, bath products. Don't use it as a water cup, or use it as a storage container for other items. Cleaning is not thorough and should not be recycled.

No. 3: PVC (polyvinyl chloride),

It is a polymer of vinyl chloride. Polyvinyl chloride (PVC) is a synthetic material with many advantages and is an ideal material for engineering plastics. Good chemical stability, acid, alkali and some chemicals. Resistant to moisture, aging and flame retardant. When used, the temperature should not exceed 60 ° C, and it will harden at low temperatures.

It is used to manufacture water pipes, raincoats, school bags, building materials, plastic films, plastic boxes and so on. Common raincoats, building materials, plastic film, plastic boxes, etc. Excellent plasticity, low price, so it is very common to use, can only heat 81 ° C. High temperature is easy to produce bad substances, rarely used in food packaging. Difficult to clean and residue, do not recycle. Do not buy if you have a drink.

Polyvinyl chloride is divided into soft plastic and hard plastic. The soft type is mainly made into a film, used as a packaging material, a rainproof article, an agricultural seedling film, etc., and can also be used as an insulating layer of a cable or a wire, and an artificial leather product. Rigid, generally made of tubing and sheeting, used as a water pipe and transporting corrosion resistant fluid pipes, which are used as linings and floors for various tanks.

Other related: the color is yellowish translucent and shiny. Transparency is better than polyethylene, polyphenylene, worse than polystyrene, and it is divided into soft and hard polyvinyl chloride according to the amount of additives. The soft products are soft and tough, and the hand feels sticky. The hardness of hard products is higher than that of low density polyethylene. Below polypropylene, whitening occurs at the bend. Common products: plates, pipes, soles, toys, doors and windows, wire sheaths, stationery, etc.

No. 4: LDPE (low density polyethylene),

Plastic bags that can be seen everywhere are mostly made of LDPE.
Common plastic wrap, plastic film, etc. Harmful substances are produced at high temperatures. When toxic substances enter the human body with food, they may cause diseases such as breast cancer and birth defects. Keep the plastic wrap in the microwave oven.

No. 5: PP (polypropylene),

A thermoplastic resin obtained by polymerizing propylene. It is white translucent when uncolored, waxy; lighter than polyethylene. Transparency is also better than polyethylene (PE) and harder than PE.

Common products: pots, barrels, furniture, film, woven bags, bottle caps, car bumpers, etc.

(Common soy milk bottles, yogurt bottles, juice drinks bottles, microwave lunch boxes. Melting point up to 167 ° C, is the only plastic box that can be placed in the microwave oven, can be reused after careful cleaning. Need to pay attention, some microwave lunch boxes, boxes The body is made of No. 5 PP, but the cover is made of No. 1 PE. Since the PE cannot withstand high temperatures, it cannot be placed in the microwave together with the case.)

No. 6: PS (polystyrene)

Transparent when not colored. The product is grounded or beaten, with a metal-like crisp sound, good gloss and transparency. Similar to glass, it is brittle and easy to break. Fingernails can make traces on the surface of the product. The modified polystyrene is opaque.

Due to its low water absorption, it is used to make building materials, toys, stationery, rollers, and cup boxes or disposable tableware for instant drinks. Common products: stationery, cups, food containers, appliance casings, electrical accessories, bowls of instant noodles, fast food boxes. Can not be placed in the microwave to avoid release of chemicals due to excessive temperature. After acid (such as orange juice) and alkaline substances, it will decompose carcinogens. Avoid packing hot food with a snack box. Don't use a microwave to cook bowls of instant noodles.

No. 7: Other.

Common PCs such as kettles, space cups, and bottles. Department stores commonly use water cups of this kind, PA type, that is, nylon, which is mostly used for interior parts of fiber textiles and some home appliances. PC is easy to release toxic substance bisphenol A under high temperature conditions, which is harmful to human body. Do not heat when using, do not expose to direct sunlight. )