<P> In the United States, plastic water bottles are regulated by the FDA which also inspects and samples bottled water plants periodically . Plastic water bottle plants hold a low priority for inspection due to a continuously good safety record . In the past, the FDA maintained that there was a lack of human data showing plastics pose health problems, however in January 2010, the FDA reversed its opinion saying they now have concerns about health risks . An article published on November 6, 2017 in Water Research reported on the content of microplastics in mineral waters packed in plastic or glass bottles, or beverage cartons . In 2018, research conducted by Sherri Mason from the State University of New York in Fredonia revealed the presence of polypropylene, polystyrene, nylon and polyethylene terephthalate microparticles in plastic bottles . Polypropylene was hereby found to be the most common polymeric material (54%) and nylon the second most abundant (16%) polymeric material . The study also mentioned that polypropylene and polyethylene are polymers that are often used to make plastic bottle caps . Also, 4% of retrieved plastic particles were found to have signatures of industrial lubricants coating the polymer . The research was reviewed by Andrew Mayes of the University of East Anglia (UEA) School of Chemistry The European Food Safety Authority suggested most microplastics are excreted by the body, however the UN Food and Agriculture Organization warned that it is possible that the smallest particles (<1.5 μm) could enter the bloodstream and organs, via the intestinal wall . </P> <P> Plastic bottles are marked at their base with the resin identification code to indicate the material used . </P>

When was the first plastic soda bottle made