MTBE(methyl tert-butyl ether)為甲基叔丁基醚的英文縮寫，是一種高辛烷值汽油添加劑，化學含氧量較甲醇低得多，利于暖車和節約燃料，蒸發潛熱低，對冷啟動有利，常用于無鉛汽油和低鉛油的調合。也可以重新裂解為異丁烯，作為橡膠及其它化工產品的原料。質量最好的甲基叔丁基醚，可以用作醫藥，是醫藥中間體。俗稱"醫藥級MTBE"或"醫藥級甲基叔丁基醚"。甲基叔丁基醚的毒性，危險性，在儲存和使用過程中也要充分重視。
MTBE(methyl tert-butyl ether) is the English abbreviation of methyl tert-butyl ether, is a high-octane gasoline additive, chemical oxygen content is much lower than methanol, conducive to warm the car and fuel saving, evaporation potential heat is low, favorable to cold start, often used in unleaded gasoline and low lead oil blending. It can also be recracked into isobutylene, which is used as a raw material for rubber and other chemical products. The best quality methyl tert-butyl ether, can be used as medicine, is a pharmaceutical intermediate. Commonly known as "pharmaceutical grade MTBE" or" pharmaceutical grade methyl tert-butyl ether ". The toxicity and danger of methyl tert-butyl ether should also be paid full attention in the process of storage and use.