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Pick a plastic cup and see the number in the triangle
Plastic products have brought us a lot of convenience in life, but also a lot of negative reports about it. From the plasticizer to bisphenol A, all plastic products enable people to nurse a grievance. Recently, the micro Bo said, drink shop, selling hot drinks the cup cover, are marked with a triangle symbol, which is also written in Arabic numerals "6", the cup on behalf of the material is polystyrene (PS) and the material at high temperatures will release harmful substances. This statement is not true? What is the meaning of the digital code of the plastic cup?
The meaning of a triangle...
The cup lid is marked with a number of "6" of the material is polystyrene (PS), generally in the heating up to 90 or more when the release of toxic substances. Therefore, as long as the temperature is not too hot, this material is relatively safe.
Market most bottles of mineral water, carbonated beverage bottles, food packaging tank at the bottom of the small triangle mark the number "1", and most of the plastic cup bottom mark of digital for "7", camellia, Lok buckle and other brands of plastic cup bottom digital most "5". Some fresh-keeping box, microwave oven box at the bottom of the standard digital "5", most of the microwave oven box on the back of the, businesses are on the label note: "when used in a microwave oven, can only be used for low temperature heating and thawing, do not close tight lid."
These small triangles at the bottom of the plastic cup are the plastic recycling logo, the number in the triangle represents the plastic material used by the container. Such as "1" on behalf of PET (polyester) material, this material is used for plastic bottle, carbonated beverage bottles, heat to 65 degrees, cold to -20, only suitable for the installation of warm or cold drink, high temperature liquid or heating is easy deformation. "5" on behalf of the PP (polypropylene) materials, the material resistance to high temperature of 120 DEG C, tolerance to low temperature of - 20 DEG C, used for manufacturing microwave stove boxes, plastic box. "7" on behalf of the PC (or other plastic) and other resin mixture, purified water, heat, water bottles are manufactured by PC.
In addition to "1" and "5", "7", "2" represents HDPE (high density polyethylene) material, used for white bottle, clean supplies the bottle, bath products bottle. "3" represents PVC (PVC) material, this material is rarely used in food packaging, commonly used in a raincoat, building materials, plastic film, plastic boxes, etc.. "4" on behalf of LDPE (low density polyethylene) material, and more for plastic film, plastic film, etc., the heat resistance is not strong (so it is best to remove the film after the food into the microwave oven). "6" represents PS (polystyrene) material, generally used for instant noodle boxes, fast food boxes, transparent food cans, fruit etc.. This material is heat and cold, but can not put into the microwave oven.
"5" or "7"
To understand the meaning of the figures, we can understand why the mineral water bottles, drink bottles can not be used as hot water bottles. However, for the daily cup, what is "5" or "7" good?
Although PP, PC is a plastic cup of common material, but PP material cup maximum withstand 130 DEG C temperature and is the only can be put into the microwave oven in the plastic box, repeated use; PC material cup can only withstand 95 DEG C temperature, high temperature, will release bisphenol A, higher temperature, the release of more. Therefore, Sheng hot water "5" is better than "7", the PP material of the cup is the most suitable for use in hot water, PC is more suitable for cold water and cold drinks. Plastic cups for infants and children is best to use PP class material.