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In page Plastic:

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In the EU, over 400 additives are used in high volumes.[5][4] In a global market analysis, 5,500 additives were found.[6] At a minimum, all plastic contains some polymer stabilizers which permit them to be melt-processed (molded) without suffering polymer degradation. Additives in polyvinyl chloride (PVC), used widely for sanitary plumbing, can constitute up to 80% of the total volume.[4] Unadulterated plastic (barefoot resin) is rarely sold.[citation needed]