... 300ppm max , color 10# Equipped with the combination unit of 30,000T/A of N-Methyl-2-pyrrolidone, we now are ... (D420)g/ml:1.028~1.033Melting point:-23.6°CBoiling point:202°CFlash point:PH-value(100g/l)at 20°CRefractive index ... compound, NMP has such advantages as non-toxicity, high boiling point, low corrosion, high solubility, low viscosity, low volatility and good ...