Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Small Vinyl Ester is a slightly water soluble, highly viscous prepolymer, which is placed on the market as an approximately 50% solution in a reactive diluent for industrial and professional use only. When exposed to light, Small Vinyl Ester will polymerise and bind all Small Vinyl Ester and most of the reactive diluent covalently in an extremely stable and highly water insoluble polymer with very low bioavailability in water and soil. See the CSA for further details.


The hydrolysis half-life time (t½) was found to be strongly correlated to temperature and pH. For example, at pH 4 and at 20 °C t½ was 37 days (the highest obtained in the experiment); while at pH 9 and 50 °C, the t½ was found to be 5 hours (the lowest obtained in the experiment).


The evaluation of biodegradation in water was made based on a relevant OECD Guideline Study, and because Small Vinyl Ester did not reach the pass level of 60% for ready biodegradability in the Manometric Respirometry Test within the 10 day window or after 28 days of incubation, Small Vinyl Ester cannot be termed as readily biodegradable.


Due to its specific characteristics that are described above, Small Vinyl Ester is unlikely to reach water thus direct and indirect exposure of water is judged to be unlikely. The modelled BCF confirms the low potential for bioaccumulation in aquatic organisms and food chains.

Transport and distribution

The Koc value of the substance is 24000, and log Koc is 4.38 both at 35 °C. The high values indicate that Small Vinyl Ester will bind tightly to soils and sediments and thus, reduce overall exposure potential.