Dimethyl ether (DME) is used as a propellant/solvent in production of polyurethane foams, as well as a foaming agent when producing extruded polystyrene foam (XPS). DME is a pressurized liquefied gas, colorless and odorless. The main parameters of the product quality: - DME content - not less than 99.99%; - Non-volatile matter (oil) content - not more than 0.001%; - water content - not more than 0.005%; - Methanol content - not more than 0.0001%; - Sulfur compounds (in terms of sulfur) - not more than 0.0001%; - Appearance - Colorless; - Odor - No.