Registration Dossier
Registration Dossier
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EC number: 931-584-3 | CAS number: 66071-92-9
Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
- Black liquor contains numerous organic and inorganic ingredients, and some surface activity can be expected among some of the minor constituents, but it is not a desired property of the whole substance. The identified main constituents of Black liquor are not estimated to have significant surface active properties. Therefore no testing of surface activity is needed.
- Data waiving is based on the specific adaptation rules in column 2 of Annex VII (7.6) in the REACH regulation.
- According to the literature references average surface tension for Black liquor is 27.72 mN/m at 55% dry solids content and 90°C temperature.
Key value for chemical safety assessment
Additional information
Data can be waived, because Black liquor consists of numerous organic and inorganic ingredients, and some surface activity can be expected among some of the minor constituents, but it is not a desired property of the whole substance. The identified main constituents of Black liquor are not estimated to have significant surface active properties.
Additional information:
According to Söderhjelm (1988) average surface tension of Black liquor is 27.72 mN/m at 55% dry solids content and 90°C temperature.
Ferreira et.al. (2005) have studied surface tension of Black liquor. At the temperature of 20
the static surface tension for Black liquor was 32.63 (mN/m) when solids content was 35%. At the temperature of25°C the surface tension measured was 32.27 (mN/m), when solids content was 35%.
According to Söderhjem & Hausalo (1996) the surface tension of strong black liquor has been estimated to be 25-60 mN/m depending on temperature and dry solids content. Average values for kraft Black liquor (dry solids content about 40%) at the temperature 100°C: dynamic surface tension 45 mN/m (softwood) and 44 mN/m (hardwood). At the temperature 90°C: static surface tension 25mN/m (softwood and hardwood).
According to Frederick and Adams (1994) it may be necessary to use a surface tension near that of water for Black liquor even though the liquor might have much lower surface tension.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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