Views:86 Author:Site Editor Publish Time: 2019-09-25 Origin:Site
BPA is one of the most widely used industrial compounds in the world. It is mainly used in the production of polycarbonate, epoxy resin, polysulfone resin, polyphenylene ether resin, unsaturated polyester resin and other polymer materials. It can also be used to produce fine chemical products such as plasticizers, flame retardants, antioxidants, heat stabilizers, rubber antioxidants, pesticides and coatings.
In the manufacture of plastic products, the addition of BPA can make it colorless, transparent, durable, lightweight and outstanding impact resistance, especially to prevent acidic vegetables and fruits from eroding metal containers from the inside, so it is widely used in canned foods and The packaging of beverages, bottles, water bottles, sealants used in dental fillings, ophthalmic lenses and hundreds of other daily necessities.
How to judge if the plastic water bottle we use contains BPA? Whether the plastic water bottle are BPA free? The following tips can help you.
Plastics are polymer chemical materials. When plastic water is used in plastic bottles, the polymer is easily precipitated and dissolved in water, which is harmful to human health after drinking. Therefore, the choice of materials for plastic bottles is very important. It is necessary to choose food grade plastics that meet the national standards.
Generally, there will be a triangular recycling mark on the bottom of the plastic bottle. What kind of material is made of water bottle, we can know by the number in this mark.
"1" - PET (polyethylene terephthalate)
It is more common in mineral water bottles and beverage bottles. This material is heat resistant to 70 ° C. It can be filled with normal temperature water for a short time, but it can not be filled with acid or alkaline beverages or high temperature liquids. It should not be exposed to the sun, otherwise it will produce harmful substances harmful to the human body.
"5" - PP (polypropylene)
The PP plastic bottle is made of polypropylene, which has good thermal stability and insulation, is safe and harmless to the human body. The product can be sterilized at a temperature above 100 ° C. Under the condition of no external force, it is not deformed at 150 ° C, and there is no pressure in boiling water.
"6" - PS (polystyrene)
A plastic bottle made of PS material, which is particularly brittle and low in temperature resistance. It cannot be used in high temperature, strong acid and alkali environments.
"7" - AS (acrylonitrile-styrene resin)
It is used for pots, bottles, bottles, etc. It is safe and resistant to falling, but it is not resistant to high temperatures. When hot water is installed, it is harmful to the human body by heat. Therefore, everyone must pay more attention when using AS plastic bottles.
"58" - PC (polycarbonate)
Common in kettles, space bottles, and plastic water bottles. However, the bottle of this material is generally not resistant to high temperatures. If it is heated or in an acid or alkaline environment, it is easy to release the toxic substance bisphenol A (BPA), so do not use it to hold hot water.
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