Registration Dossier
Registration Dossier
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EC number: 407-950-9 | CAS number: 895-85-2 INTEROX-PMBP-70W; INTEROX-PMPB-70W
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:
- September 9-10, 1991
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Well conducted GLP study, according to OECD and EEEC guidelines, purity mentioned.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Version / remarks:
- May 12, 1981
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Version / remarks:
- September 1984
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- ring method
- Surface tension:
- 69.2 mN/m
- Temp.:
- 21 °C
- Remarks on result:
- other: Saturated solution
- Conclusions:
- A saturated solution of bis(4-methylbenzoyl)peroxide has a surface tension of 69.2 mN/m. Based on the criteria as outlined in the proposed updated
version of the EEC guideline, it was concluded that bis(4-methylbenzoyl)peroxide should not be regarded as a surface active material. - Executive summary:
For REACH this endpoint could have been waived. Surface activity is not the desired property of the substance and moreover based on the chemical structure the substance will not have surface activity. The substance has a solubility in water 0.043mg/L. See 4.8 . According to ECHA Guidance on information requirements and chemical safety assessment. Chapter R.7a: Endpoint specific guidance p 78: The study needs only to be conducted if: based on structure, surface activity is expected or can be predicted; or surface activity is a desired property of the material. No surface active properties are expected, because of the absence of both a hydrophilic headgroup and a hydrophobic tail in the structure and the substance has a solubility in water lower than 1 mg/L.
A saturated solution of bis(4-methylbenzoyl)peroxide has a surface tension of 69.2 mN/m. Based on the criteria as outlined in the proposed updated version of the EEC guideline, it was concluded that bis(4-methylbenzoyl)peroxide should not be regarded as a surface active material.
Reference
Determination of the calibration factor Фbis described in the Appendix in the attachment.
Table 2 shows the individual measurements and the corrected surface tension of a solution of test substance in double-distilled water at a saturated concentration. In conclusion, the surface tension of a saturated solution of DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) in water was determined to be69.2 mN/m.Based on the criteria as outlined in the proposed updated version of the EEC guideline, it was concluded that DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) should not be regarded as a surface active material.
Table 2 Surface tension of an aqueous solution of DI-(4-METHYLBENZOYL)-PEROXID (INTEROX-PMBP) at a saturated concentration, see illustration.
Time passed between preparation and the first measurement: 3 hours
Description of key information
A saturated solution of bis(4-methylbenzoyl)peroxide has a surface tension of 69.2 mN/m. Based on the criteria as outlined in the proposed updated version of the EEC guideline, it was concluded that bis(4-methylbenzoyl)peroxide should not be regarded as a surface active material.
Key value for chemical safety assessment
- Surface tension:
- 69.2
Additional information
For REACH this endpoint could have been waived. Surface activity is not the desired property of the substance and moreover based on the chemical structure the substance will not have surface activity. The substance has a solubility in water 0.043mg/L. See 4.8 . According to ECHA Guidance on information requirements and chemical safety assessment. Chapter R.7a: Endpoint specific guidance p 78: The study needs only to be conducted if: based on structure, surface activity is expected or can be predicted; or surface activity is a desired property of the material. No surface active properties are expected, because of the absence of both a hydrophilic headgroup and a hydrophobic tail in the structure and the substance has a solubility in water lower than 1 mg/L.
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