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Water stability has been determined for 2-dimethylaminoethyl methacrylate using a OECD Guideline study. The results showed that in contact with water 2-dimethylaminoethyl methacrylate will hydrolyse slowly under environmental conditions (t1/2 = 4 days at pH 7, t1/2 = 3.2 hours at pH 9). At pH 4 no hydrolysis was observed. Hydrolyse products were methacrylic acid (CAS# 79-41-4) and 2-dimethylamino ethanol (CAS# 108-01-0). Furthermore, a calculated half-life of 3.9 hours indicates that after evaporation or exposure to the atmosphere, the substance will be rapidly degraded by photochemical processes.