CHEMBIO 3BM3 Lecture Notes - Lecture 15: Breast Implant, Dry Cleaning, Bioaccumulation
21 Apr 2019
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Stable silicone polymers degrade easily at low ph or high ph (2. 5 < ph >11) Flash off easily (low heat of vaporization) D4 increases immune response in high doses: mild adjuvant, something added to a vaccine that makes it more potent (more powerful) D4 and d5 are cyclosiloxanes mainly used as monomers for silicone polymer production. D4 has been identified as a persistent, bioaccumulative and toxic (pbt) and very persistent very bioaccumulative (vpvb) substance. D5 has been identified as a vpvb substance. Due to concerns that d4 and d5 may have the potential to accumulate in the environment and cause effects that are unpredictable and irreversible in the long-term, echa"s risk. Assessment (rac) and socio economic assessment (seac) committees agreed with the uk"s proposal to restrict d4 and d5 in wash-off personal care products in june. 2016 since they may go down the drain and enter lakes, rivers, and oceans.
