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A ready biodegradability study was conducted using a DOC die away study according to OECD 301 to investigate the aerobic degradability of Polyox PX. The DOC concentration was measured for each period (0, 7, 14,21 and 28 days) in each of inoculated flasks used for the test and control samples. According to OECD guidelines for testing chemicals, a test compound is regarded as easily biodegradable if the loss of DOC within 28 days is greater than 70 %. The pass value has to be reached in a 10-day window within the 28-day period of the test.

Under the terms of this study Polyol PX was not found to readily biodegradable as DOC removal levels only reached 23% by the end of the study period. As such Reaction mass of 1,3-Propanediol, 2-(hydroxymethyl)-2-[(methoxymethoxy)methyl]- and 1,3-dioxane-5,5-dimethanol cannot be assumed to be readily removed by biological processes in the STP, soil or sediment.