Mamolekyu a mphira a silikoni ali ndi maunyolo-monga maunyolo opangidwa ndi ma bond a Si-O (silicon-oxygen), ndipo chigawo chake chachikulu ndi polysiloxane ya mkulu wa molar mass linear. Chifukwa Si{4}}O-Si bond ndi mtundu wake womangira, ma atomu a sililikoni amalumikizidwa makamaka ndi magulu a methyl, ndipo magulu ochepa kwambiri a unsaturated amayambitsidwa pamaketani am'mbali.
Mphamvu za intermolecular ndizochepa, ndipo mamolekyu ali ndi mawonekedwe a helical. Magulu a Methyl amakonzedwa panja ndipo amatha kusinthasintha momasuka, zomwe zimapangitsa kuti mphira wa silicone ukhale ndi kutentha kwabwino, kutsekemera kwa magetsi, kukhazikika kwa mankhwala, etc. kusiyana ndi rubbers wamba.
Rabara wamba wa silicone, womwe ndi polydiformaldehyde siloxane, uli ndi masinthidwe a helical molekyulu yokhala ndi mphamvu zochepa za intermolecular, motero imakhala yolimba kwambiri. Panthawiyi, magulu a formaldehyde omwe akuloza kunja kwa helix amatha kusinthasintha momasuka, zomwe zimapangitsa kuti mphira wa silikoni ukhale ndi zinthu zapadera monga hydrophobicity ndi kusamata pamwamba-