Man siliki yawanci yana nufin samfuran polysiloxane na layi wanda ke zama ruwa a zafin jiki. Gabaɗaya an kasu kashi biyu: man methyl silicone da man silicone da aka gyara.
Dangane da madogara daban-daban akan sarkar polysiloxane. Ana iya rarraba shi zuwa nau'ikan man dimethyl silicone, kamar dimethyl silicone oil, hydroxyl silicone oil, hydrogen-mai ɗauke da silicone mai, phenyl silicone oil, alkyl silicone oil, alkyl & phenyl silicone oil, amino silicone oil, polyether-wanda aka gyara silicone oil, man fluorosilicone, da dai sauransu.