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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

General discussion

Orange DER 8638 (FAT 40810/A) is a brown powdery substance, which is produced outside of the European Union and it is used as reactive dyestuff for the coloration of cellulose/cotton fibres in alkaline media by an exhaust application process. FAT 40810/A is used in a batch dyeing process. As the dyestuff is completely fixed on the fibers, no direct or indirect exposure of consumers will occur. Therefore, the assessment will not consider private use and recovery but only the stages of production and processing of the substance.


The substance has a high degree of fixation of ca. 93 %. Consequently, a release to wastewater value of ca. 7 % is estimated. After the dyeing process, the dyed fibers are washed with water and dried. Process waters are pre-treated before discharge to the waste water treatment plant.



The bioaccumulation potential of the substance is low (log Pow approx. -4.5). Thus, no study to determine bioaccumulation in fish or other organisms was performed.



The substance has been tested on Absorption/Desorption for Log Koc: < 1.32, classified as high mobility substance by testing instance.


Stability and Degradation

The biodegradation of FAT 40810/A was determined as 2 % after 28 days of incubation. For this reason, the substance is considered to be non-readily biodegradable. Although some biodegradation was observed in the test for inherent biodegradability (13 % within 28 days) the pass criterion for inherent biodegradability was not met. When investigated for abiotic degradation by hydrolysis, FAT40810/A was found stable at pH 4 (half-life estimated >1 year) but unstable at pH 7 and pH 9 (half-life of less than 1 day). Thus, it is expected that FAT 40810 degrades abiotically in the environment. However, degradation products have not been identified and therefore the substance is considered persistent in the environment.

Additional information