N,N,N',N',N'',N''-hexamethyl-4,4',4''-methylidynetrianiline

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7950 (Vapor Pressure)

Deviations:

no

GLP compliance:

yes

Type of method:

gas saturation method

Test material

Test material information

Constituent 1

Reference substance name:

N,N,N',N',N'',N''-hexamethyl-4,4',4''-methylidynetrianiline

EC Number:

210-043-9

EC Name:

N,N,N',N',N'',N''-hexamethyl-4,4',4''-methylidynetrianiline

Cas Number:

603-48-5

Molecular formula:

C25H31N3

IUPAC Name:

4-{bis[4-(dimethylamino)phenyl]methyl}-N,N-dimethylaniline

Test material form:

solid: particulate/powder

Details on test material:

- Purity: 99.4%

Results and discussion

Vapour pressure

Vapour pressure 1

Key result

Test no.:

#1

Temp.:

10 °C

Vapour pressure:

0 Pa

Vapour pressure 2

Key result

Test no.:

#2

Temp.:

20 °C

Vapour pressure:

0 Pa

Vapour pressure 3

Key result

Test no.:

#3

Temp.:

30 °C

Vapour pressure:

0 Pa

Any other information on results incl. tables

Vapour Pressure Measurements and Out-Gassing Rates by the Spinning Rotor Gauge Method
Temperature (°C)	Measured Vapour Pressure (Pa)	Min/Max Temperature (°C)	Mean Measured Vapour Pressure (Pa)	Standard Deviation (Pa)	Coefficient of Variation (CV)
10	1.48 x 10^-5	10.0/10.4	9.70 x 10^-6	5.5 x 10^-6	56%
	1.04 x 10^-5	10.0/10.2
	3.91 x 10^-6	9.8/10.0
20	1.96 x 10^-5	19.9/20.0	1.95 x 10^-5	1.5 x 10^-6	7.7%
	2.10 x 10^-5	19.9/20.0
	1.80 x 10^-5	19.8/19.9
30	1.85 x 10^-5	29.9/30.3	1.66 x 10^-5	1.6 x 10^-6	9.7%
	1.57 x 10^-5	30.0/30.3
	1.57 x 10^-5	29.9/30.3

Applicant's summary and conclusion

Conclusions:

The vapour pressure of the test substance at 10, 20, and 30°C is 9.70E-6 Pa, 1.95E-5 Pa, and 1.66E-5 Pa, respectively.

Executive summary:

The objective of this study was to determine the vapour pressure of the test substance using the gas saturation method as required in accordance with OECD 104 and U.S. EPA Product Properties Test Guidelines OPPTS 830.7950.

The spinning rotor gauge (SRG) method is applicable to both liquids and solids with vapour pressures in the range 1E-4 Pascal (Pa) to 0.5 Pa. The SRG method is based on the measurement of the rotational frequency of a stainless steel ball, which is magnetically suspended within a vacuum chamber. In the presence of a sample in an isolated vacuum, the deceleration rate of ball rotation is proportional to the vapour pressure of the sample. Measurement was initiated with a determination of the offset value, system background pressure and out-gassing rate in the absence of sample. The background pressure and out-gassing rate were each determined in triplicate. The vacuum system and SRG were then exposed to the test substance, maintained at a temperature of 10°, 20° and 30° ± 1°C, until a steady state pressure was obtained. The test substance sample and SRG were then isolated from the vacuum pumps and the pressure increase was monitored by the SRG at pre-set 30-second intervals. A linear regression was obtained for pressure increase as a function of time. The y-intercept of the regression corresponds to the vapour pressure of the sample. The spinning rotor gauge (SRG) apparatus was verified prior to measurement of the test substance.

The vapour pressure of the test substance at 10, 20, and 30°C is 9.70E-6 Pa, 1.95E-5 Pa, and 1.66E-5 Pa, respectively.