UV-ljus och temperatur anses vara de faktorer som svarar fileör den huvudsakliga nedbrytningen vid utomhusåldring av plast. I likhet med andra plaster bryts PVC ned av solljus. Den fotokemiska nedbrytningen accelereras vid höjd temperatur.
PVC generation includes a method called polymerization, whereby monomers of vinyl chloride are chemically bonded to type a polymer chain. The two main different types of polymerization made use of are suspension polymerization and emulsion polymerization.
Occasional premature ventricular contractions in men and women with out heart problems typically usually are not a concern and certain Will not want treatment. You could possibly require cure When the untimely ventricular contractions are incredibly Recurrent or bothersome, or In case you have an underlying coronary heart condition.
قالبگیری به روش تزریقی، اکستروژن و شکلدادن حرارتی نیز از روشهای دیگر هستند.
About 50 percent of the earth's PVC generation potential is in China, Regardless of the closure of many Chinese PVC plants as a result of concerns complying with environmental rules and poor capacities of scale.
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Allt eftersom biltillverkarna har sökt efter lättare substance har fler och fler detaljer i bilen blivit tillverkade i plast.
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حتی با وجود اینکه پیویسی اسباببازیهای نرم برای نوزادان برای سالها ساخته شدهاست، این نگرانی وجود دارد که این افزودنیها از اسباببازیهای نرم به دهان کودکانی که آن را به دهان میبرند نشت کند.
・価格が安価:他の材質に比べて価格が安価。重量も重たくないので、運送費や管理費なども抑えられる。
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