DIN 55689
DIN 55689 Solvents for paints and varnishes - Propylene glycol ethers - Gas chromatographic determination of the degree of purity
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2006
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2006