In recent studies conducted by researchers at the University of Cincinnati in the United States, the release of bisphenol A (BPA) from polycarbonate plastic bottles was closely examined. The findings revealed that BPA leakage is not significantly influenced by whether the bottle is new or old, but rather by the temperature of the liquid it contains. Specifically, when both new and used polycarbonate beverage bottles were exposed to boiling water, the release rate of BPA—an environmental estrogen—increased dramatically, reaching up to 55 times higher than when exposed to room-temperature water.
The study also found that in cold or warm water, both new and used bottles released BPA at similar rates. However, when placed in boiling water, the release levels surged. Before exposure to high temperatures, BPA was released at a rate of 0.2 to 0.8 ng/h. After being submerged in boiling water, this rate jumped to 8 to 32 ng/h, meaning the release speed increased by 15 to 55 times. Dr. Belcher, one of the researchers, noted that while the exact harmful level of BPA for humans remains unclear, he urged consumers to be mindful of the long-term health effects of cumulative environmental exposure.
This research sparked widespread public concern about the safety of BPA in plastic bottles. However, the bisphenol A industry argued that the findings lacked comprehensive scientific support. In response, several scientific groups and government agencies have conducted extensive reviews on BPA’s safety. Their conclusions reaffirmed that polycarbonate bottles can still be safely used.
The industry highlighted three main points in its rebuttal. First, they emphasized that over time, polycarbonate bottles degrade, so an older bottle may behave differently from a new one. Second, they pointed out that increased BPA release at higher temperatures is not a new discovery, as migration rates typically rise with temperature—a well-documented phenomenon in prior studies. Third, while the University of Cincinnati raised concerns about long-term effects, their study only focused on short-term migration rates in boiling water.
To address these concerns, researchers at the University of Athens conducted repeated tests on BPA release from polycarbonate bottles. They found that while BPA migration increases in boiling water, after 4 to 8 cycles of use, the release rate dropped significantly—even when boiling water was used each time. This suggests that the increased release at high temperatures is temporary, and the risk diminishes with continued use. Overall, the findings indicate that while BPA release does increase under extreme conditions, it is not necessarily a cause for long-term alarm if proper usage guidelines are followed.
Trichloroethylene
Trichloroethylene is a colorless, volatile liquid. Liquid trichloroethylene evaporates quickly into the air. It is nonflammable and has a sweet odor.1.The major use of trichloroethylene is as an industrial solvent for the vapour de-greasing and cold cleaning of metal parts.
2.Trichloroethylene is also used as an extraction solvent for greases, oils, fats, waxes, and tars, a chemical intermediate in the production of other chemicals (e.g. insecticides and fungicides) and as a refrigerant.
3.It is also used in consumer products such as paint stripper, adhesive, cleansing fluids and correction fluids. The main user end market is the plastics, metal, paints, adhesive and cleansing industries.
Chemical Trichloroethene,Purity 99% Trichloroethylene,Industrial Grade Trichloroethylene,High Purity Chemical Trichloroethene
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