What is MTBE?
MTBE (methyl tertiary butyl ether) is a fuel additive that belongs to a class of chemicals known as ethers, which contain an oxygen atom interposed between two hydrocarbon groups. It is a flammable liquid with a distinctive, disagreeable taste and odor. It is made by combining isobutylene (a byproduct of the petroleum refinery process) and methanol (which is derived from natural gas).