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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

A test according to OECD guideline 111 was performed to determine the hydrolytical stability of dicyandiamide.

A preliminary test was conducted with an initial test concentration of dicyandiamide of 0.002 mol/L at pH of 4.0, 7.0 and 9.0 at 50 °C. Concentrations of dicyandiamide were measured with HPLC/UV at days 0, 1, 2, 3, 4, and 7.

At pH 7.0 and 9.0 the concentration of dicyandiamide did not change significantly within 7 days. At pH 4.0 the concentration of dicyandiamide at day 7 was 86.6 % of the initial concentration. The hydrolysis rate constant at pH 4.0 was therefore 0.019/d. The concentration of dicyandiamide after 5 days at pH 4.0 was 90.5 % of the initial concentration.

Since less than 10 % of the test substance is hydrolysed in 5 days, in accordance with OECD guideline 111 no further hydrolysis test have to be performed. The test substance dicyandiamide is considered hydrolytically stable.

Additional information