Indian Oil Corporation Ltd. Offers Butane and Propane Gas. Indian Oil Corporation Ltd. Is an ISO 9002 accredited company. The company supplies Diesels, Fuels, Gas and Lubricants with different brand names. The Butane and Propane Gas comes under the brand name "Indane" is heavier than air; thus it normally settles down in low-lying places. Since LPG has only a faint scent, a mercaptan odorant is added to help in its detection. In the event of an LPG leak, the vaporisation of liquid cools the atmosphere and condenses the water vapour contained in it to form a whitish fog, which is easy to observe. LPG in fairly large concentrations displaces oxygen leading to a nauseous or suffocating feeling.