In linguistics and grammar, a pronoun (abbreviated PRO) is a word that substitutes for a noun or noun phrase. It is a particular case of a pro-form.
Some of the most significant toxic effects associated with substances used or emitted in plastic production include: 13. 1  Benzene (PET, PVC, LDPE, PP): known human carcinogen, workplace exposure depresses the nervous system. 2  Chromium oxide (HDPE, LDPE): suspected carcinogen, damaging to the liver and nervous system.ome of the most significant toxic effects associated with substances used or emitted in plastic production include: 13. 1  Benzene (PET, PVC, LDPE, PP): known human carcinogen, workplace exposure depresses the nervous system. 2  Chromium oxide (HDPE, LDPE): suspected carcinogen, damaging to the liver and nervous system.
This is the role of plasticisers and such process is technically called plasticising. PVC polymer molecules have positive and negative polarities inside, while plasticiser molecules also have such polar and non-polar parts.he PVC polymer molecules and the plasticizer molecules are electrically attracted to each other, and the non-polar parts widen the distance among the polymer molecules to keep softness. PVC products which are softened by plasticisers are called soft (flexible) PVC products.