As used in sections 43-37 to 43-44, inclusive, "liquefied petroleum gas" means any material that is composed predominantly of any of the following hydrocarbons or mixtures of the same: Propane, propylene, butane, normal or isobutane and butylene.
Conn. Gen. Stat. § 43-36
(1951, S. 2882d; P.A. 14-122, S. 179.)