Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Hydrolysis

Hydrolysis of SIKA Hardener LTJ was very fast and most rapid in acidic environment (acetous water) compared to basic environment (bidest. water). Due to the fast hydrolysis of the test substance of < 2 sec the half-life was determined to be < 1 min.

Biodegradation

Sika Hardener LTJ was classified as not readily biodegradable but fulfils the criteria for inherently biodegradation since theThOD was above 20% within 28 days.

 

Additional information

Hydrolysis

Hydrolysis of SIKA Hardener LTJ was very fast and most rapid in acidic environment (acetous water) compared to basic environment (bidest. water). Due to the fast hydrolysis of the test substance of < 2 sec the half-life was determined to be < 1 min.

Biodegradation

A study was conducted according to OECD TG 301-F and Directive 92/69/EWG method C.4-D. The test item Sika Hardener LTJ was tested using a concentration of about 80 mg test item/L (equivalent to a theoretical oxygen demand of about 250 mg O2/L). Activated sludge was used as inoculum. The test was left running for 28 days. All validity criteria were met. The reference item reached the pass level of 60% on day 4.The degree of biodegradation reached an average value of 51 % after 28 days. The 10d-window began on day 1, at its end, 41 % were reached, staying below the pass level of 60%. Thus, Sika Hardener LTJ was classified as not readily biodegradable. According to ECHA guidance IR/CSA chapter R7b, the substance fulfils the criteria for inherently biodegradation since the ThOD was above 20% within 28 days.