Undecane ek lightweight branched ya linear hydrocarbon hai (C11 alkane) jo cosmetic formulations mein use hota hai. Yeh volatile emollient aur solvent ka kaam karta hai, jisee tridecane ke saath pair kiya jaata hai silicones ki jagah lene ke liye. Skin par smooth feel deta hai aur easy spreadability provide karta hai, without heavy residue reh jaane ka.