pentamethylcyclopentasiloxane /ˌpɛntəˌmɛθəlˌsaɪkləʊˌsaɪləˈsɒkseɪn/ noun1 •A cyclic organosilicon compound consisting of a five-membered ring of alternating silicon and oxygen atoms, with five methyl groups attached to the silicon atoms. It is primarily used as a precursor in the production of specialized silicones and polymers. formspentamethylcyclopentasiloxanes
