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One important classification of plastics is the degree to which the chemical processes used to make them are reversible or not. Thermoplastics do not undergo chemical change in their composition when heated and thus can be molded repeatedly. Examples include polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC). [13]
The plastic kits and covers are mostly made of synthetic polymers like polythene, and tires are manufactured from polybutadienes. [1] However, due to the environmental issues created by these synthetic polymers which are mostly non-biodegradable and often synthesized from petroleum, alternatives like bioplastics are also being considered.
It is a polymer, primarily used for packaging (plastic bags, plastic films, geomembranes and containers including bottles, cups, jars, etc.). As of 2017 [update] , over 100 million tonnes of polyethylene resins are being produced annually, accounting for 34% of the total plastics market.
The remaining 5% of BPA is used in a wide range of applications, many of which involve plastic. [49] BPA is a main component of several high-performance plastics , the production of these is low compared to other plastics but still equals several thousand tons a year.
A handful of chemicals. The new research analyzed the impact of four groups of chemicals used in the production of plastic products: Flame retardants called polybrominated diphenyl ethers, or PBDE ...
The non-profit consumer group said on Thursday that 84 out of 85 supermarket foods and fast foods it recently tested contained "plasticizers" known as phthalates, a chemical used to make plastic ...
We only looked at three categories of chemicals used in plastic materials," said Trasande, "and there are tens of thousands of chemicals used in plastic. So we are just barely scratching the surface."
The petrochemical industry has been trying to save itself by attempting to rapidly expand demand for plastic products worldwide (i.e. through pushbacks on plastic bans and by increasing the number of products wrapped in plastic in countries where plastic use is not already as widespread (i.e. developing nations)). [5]
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