The methylal is low in price and good in stability. The disadvantage is that most of it is 90% and contains a lot of methanol. Methanol has low price and poor stability; Dichloromethane, with low price and good stability, has the disadvantage of low boiling point; In addition, many solvents are used, such as ethanol, toluene and ethyl acetate. , all around 1W, tetrahydrofuran is more than 2W. It is more convenient to check the specific price of Alibaba.