Many people like to drink tea in plastic cups, such as space cups, but many are worried that there will be toxic substances in the boiled water filled with plastic cups. Let super brother give you the correct answer to such a tangled question.
PC plastic is a kind of widely used material, which is mostly used to make milk bottles, space cups and so on. Many people think that BPA contained in PC plastics may be related to breast, prostate and reproductive system diseases, and may induce some cancers, so it should not be used to contain hot water .
Super brother told you here that containers containing BPA are safe under the specified upper temperature limit and will not produce toxicity, but at present, in line with the principle of "caution", the European Union has banned the sale of PC plastic milk bottles containing BPA.
Types of plastics
I believe you will find the triangle sign under plastic products. First of all, let's understand the logo and use range of common plastic products . There are great differences in the use of different plastic products.
The PC plastic we are talking about today belongs to one of the other categories. PC is polycarbonate, which has excellent mechanical properties, good light transmittance and non-toxic. However, there are many doubts about the existence of toxic bisphenol A in the process of PC synthesis.
What is bisphenol A?
Bisphenol A is a kind of chemical raw material, which is used to synthesize polycarbonate and epoxy resin in industry. Polycarbonate (PC), a transparent hard plastic, is often used to make baby bottles. Scientists have found that long-term low-dose bisphenol A intake can also cause "adverse changes" in some physiological indicators of experimental animals. Such a "low dose" is equivalent to the maximum amount of BPA that the human body may ingest. Therefore, many scientists question the safety of bisphenol A .
Due to the existence of bisphenol A, Canada became the first country to ban bisphenol A from being put on the market in 2010; in March 2011, the European Union also put bisphenol A into the cold palace; however, until now, there is no direct evidence to support that bisphenol A has significant food safety problems for infants. That is to say, we can neither confirm that BPA is harmless nor that it is harmful. But we need to take a more conservative attitude towards food safety, especially for infants. The treatment of bisphenol A is the embodiment of such "caution" .
Can normal use cause problems?
So in addition to infant food safety Prudent Practices, adult normal use will really have such a big harm? Don't be so flustered. In fact, PC is washed and precipitated in the final stage of synthesis to remove the unreacted bisphenol A and salts. The processing of PC needs to be dried strictly to avoid decomposition. Although PC products may be in contact with water for a long time in use, they will not decompose to produce bisphenol A below the specified upper limit temperature of the container. Some studies have found that PC thermal separation with qualified initial phenol content liberates phenols to reach a high temperature of about 200 ℃, which is far higher than the normal use temperature of water cup and so on.
According to the national standard hygienic standard for polycarbonate products for food containers and packaging materials (GB 14942-1994), the free phenol of the processed food containers and packaging materials made of polycarbonate resin for food packaging should be controlled below 0.05m g / L. Polycarbonate (PC) can be used for a long time at - 60 ℃ ~ 120 ℃, its embrittlement temperature is - 100 ℃, and its maximum use temperature is 140 ℃