Physicochem., toxicol and ecotoxicol. properties of hydroxyester (HE-1) obtained in aldol condensation of Me2CHCHO were detd. in accordance with int guidelines and compared with the properties of Bu-2-phtalate and Bu diglycol acetate plasticizers commonly used in the paint industry. HE-1 was not classified as a volatile org. compd. and its use does not result in an increase in the greenhouse effect. The tested compds. irritated the humans skin. Bu2-phtalate showed the biggest negative impact on the aq. environ. at concn. 0.73 mg/L. The HE-1 and Bu diglycol acetate were less toxic used in concns. 41 and 77 mg/L, resp.