Many beverage bottles and mineral water bottles have a triangle mark with an arrow at the bottom, which is labeled with a number. And different materials in different temperature, humidity and other conditions may precipitate toxic and harmful substances, is not safe. So how can we understand the characteristics of various materials, safe to use?
It is understood that the plastic class recyclable logo Europe, the United States, Japan and other countries, all plastic manufacturers are based on ISO11469 international standards for the classification of plastic products, up to the standard of plastic products are not allowed to enter the market at all. While China has introduced the "mark of plastic products" (GB/T16288-2008), some of the regular big brand companies in order to facilitate the recovery of plastic products, have also begun to mark the recycling logo.
Number 1 in the triangle at the bottom of the plastic bottle: PET Polyethylene terephthalate
Most commonly used in the production of mineral water, carbonated drinks and other bottled beverages. As we all know, the beverage bottle made of this material can not be loaded with hot water, only suitable for warm or frozen drinks, loaded with high-temperature liquids or heating is easy to deform, dissolved substances harmful to the human body, so it is recommended to drink all the beverage bottles on the discard, do not use it as a cup of water, or storage containers. In order to avoid health hazards, the loss is not worth the gain.
The number 2 in the triangle at the bottom of the plastic bottle: HDPE (High Density Polyethylene).
Plastic containers with cleaning products, bath products or plastic bags commonly used in shopping malls are mostly made of this material. It can withstand temperatures up to 110°C and can be used for food if labeled for food. Plastic containers for cleaning and bathing products can be reused after careful cleaning, but they are often difficult to clean, leaving residues that can become a breeding ground for bacteria. It is best not to reuse them unless they are thoroughly cleaned.
Number 3 in the triangle at the bottom of plastic bottles: PVC (polyvinyl chloride)
Commonly found in raincoats and plastic films. Plastic products made of this material are prone to produce two toxic and harmful substances: one is the production process has not been completely polymerized monomolecular vinyl chloride, and the second is the harmful substances in plasticizers. These two substances are easy to precipitate when encountering high temperatures and grease, if inadvertently enter the human body, easily carcinogenic. Therefore, it is rarely used for food packaging, if you happen to meet, do not let it be subjected to heat.
Number 4 in the triangle at the bottom of the plastic bottle: PE Polyethylene
The raw material for cling film and plastic film is not heat resistant. Qualified PE cling film at a temperature of more than 110 ° C will appear hot melt phenomenon, leaving some of the human body can not decompose the plastic agent. And if wrapped around the outside of the food while heating, the oils and fats in the food are more likely to dissolve the harmful substances in the cling film.
Number 5 in the triangle at the bottom of the plastic bottle: PP Polypropylene
This is the only material that can be heated in a microwave oven, so it has become the raw material for making microwaveable lunch boxes. It is resistant to high temperatures up to 130°C, has a melting point of 167°C, has poor transparency, and can be reused after careful cleaning.
The number 6 in the triangle at the bottom of the plastic bottle: PS polystyrene.
The temperature range is 60-70 degrees, but it can't be put in the microwave because the high temperature will release chemicals. It is also not suitable for acidic beverages, which may break down polystyrene, which is bad for the human body and can easily cause cancer.