Registration Dossier
Registration Dossier
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EC number: 269-924-1 | CAS number: 68391-05-9 This substance is identified by SDA Substance Name: C12-C18 dialkyl dimethyl ammonium chloride and SDA Reporting Number: 16-047-00.
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 304 “Surface active agents – Determination of surface tension by drawing up liquid films”
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Deviations:
- no
- Principles of method if other than guideline:
- Not applicable
- GLP compliance:
- not specified
- Type of method:
- other: According to Du Noûy method and Method DIN 53914
- Key result
- Surface tension:
- ca. 28 mN/m
- Temp.:
- 23 °C
- Conc.:
- 0.2 g/L
- Conclusions:
- Under the study conditions, the surface tension of the test substance at 0.2 g/L was determined to be 28 mN/m.
- Executive summary:
A study was conducted to determine the surface tension of the test substance, C12-18 DAQ (99.6% active) according to the OECD guideline 115 and ISO standard 304 at pH 7. The surface tension at 0.2 g/L has been determined to be 28 mN/m. However, it should be noted that the sample was not completely water soluble. Under the study conditions, the surface tension of the test substance at 0.2 g/L was determined to be 28 mN/m (Ulama & Anderson, 2010).
Reference
The CMC was determined from the CMC curve by solving the two equations. The CMC for the test substance was determined to 2.3 mg/L at pH 7.0. The operating temperature was room temperature, in this case 23 °C. Also, the surface tension at 0.2 g/L solution has been determined to 28 mN/m. However, it should be noted that although the sample was not completely water soluble. Therefore, solid particles might have had an impact on the CMC value. Hence, it is important to realize that not all of the surfactant was present as monomers during the CMC determination.
Description of key information
The surface tension of the test substance was determined according to OECD Guideline 115 and ISO method 304 (Ulama & Anderson, 2010).
Key value for chemical safety assessment
- Surface tension:
- 28
- in mN/m at 20°C and concentration in mg/L:
- 200
Additional information
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