4.1 Knowledge of the impurities is required to establish whether the product meets the requirements of its specifications.
1.1 This test method describes the gas chromatographic determination of glycol impurities in Mono-, Di- Tri- and Tetraethylene Glycol (MEG, DEG, TEG and TeEG) in the range of 5 to 3000 mg/kg, and in Mono- and Dipropylene Glycol (MPG and DPG) in the range 0.01 to 2.5 % (m/m).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.