Dioctyl Phthalate DOP is a colourless clear liquid. We are keeping ready stock of materials at KANDLA, Mumbai, Kolkata, Chennai, Visakhapatnam, Dubai DOP is most common plasticizer product used in the production of flexible polyvinyl chloride (PVC) plastic. Dioctyl Phthalate is one of the most widely used plasticizers in PVC due to its low cost.