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 Diisononyl phthalate (DINP) is used to soften or “plasticize” polyvinyl chloride (PVC), commonly referred to as vinyl. DINP is a general purpose plasticizer used in a multitude of vinyl products that demand flexibility, durability and specific functionality. While DINP’s primary function is as a softener, it is also used in sealants, paints and lubricants. 
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