polyurethane flexible foam are  made by  organic polyisocyanate  reacted with an active hydrogen-containing component such as an organic polyol, in the presence of a urethane catalyst, a blowing agent, optionally a cell opener, and a siloxane-based surfactant composition as a stabilizer for the foam. The siloxane-based surfactant composition comprises a silanol-functionalized organosiloxane having general formula (I), Single silanol groups are known as free or isolated silanols, silendiol is known as germinal, hydrogen bonded as vicinal silanols, single or double as germinal, terminal as well. strained siloxane bridges are formed by vicinal silanols hence are highly usable for grafting purposes.