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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21 July 1992 - 4 Februsry 1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1993
Report date:
1993

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Principles of method if other than guideline:
The surface tension was determined for a 90 % saturated aqueaous solution of the hydrolysis product.
GLP compliance:
yes
Type of method:
OECD harmonised ring method

Test material

Constituent 1
Chemical structure
Reference substance name:
3,5-dimethylbenzoyl chloride
EC Number:
413-010-9
EC Name:
3,5-dimethylbenzoyl chloride
Cas Number:
6613-44-1
Molecular formula:
C9H9ClO
IUPAC Name:
3,5-dimethylbenzoyl chloride
Details on test material:
DMBC
Appearance: clear, colourless liquid
Storage conditions: room temperature in the dark

Results and discussion

Surface tension
Surface tension:
64.6 mN/m
Temp.:
21 °C
Conc.:
90 vol%
Remarks on result:
other: Result for the hydrolysis product

Any other information on results incl. tables

CALIBRATION

Literature value for surface tension of water at 21 °C = 72.58 mN/m

Therefore Φb = 72.58 mN/m / 73.0 mN/m

= 0.99425

 

TEST SUBSTANCE

Surface tension readings for the test solutions are given in Table 1.

Surface tension of the blank solution was 71.5 mN/m showing that the test procedure has no significant effect on the surface tension of the water.

Test solution surface tension corrected for calibration factor:

 = 65.0 mN/m x 0.99425

= 64.6 mN/m

 

Table 1 Surface Tension Readings of Test Solutions at 21 °C

Time (minutes)

Measured Surface Tension (mN/m)

Test 1

Test2

0

2

4

6

64.0

65.0

65.0

65.0

64.0

65.0

65.0

65.0

Mean of Last 3 Readings

65.0

 

Overall Mean

65.0

Applicant's summary and conclusion

Conclusions:
Evidence suggests that DMBC does not exist in aqueous media, being converted instantly to its acid. DMBC cannot therefore affect the surface tension of the water.

Conversely dimethylbenzoic acid has been found to affect the surface tension of water. A 90 % saturated aqueous solution showed a surface tension of 64.6 mN/m compared to that of distilled water, 73.0 mN/m (at 21 °C).
Executive summary:

A test to calculate the surface tenstion of DMBC was conducted in accordance with EU method A5. The surface tension was determined using the harmoised ring method.

DMBC cannot cause any significant effect on the surface tension of water but a 90 % saturated aqueous solution of its hydrolysis product has been found to possess a surface tension value of 64.6 mN/m at 21 °C.