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Physical & Chemical properties

Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
December 1991
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: guideline study (A.4)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: 84/449/EWG, A.4 (vapour pressure balance)
Deviations:
not specified
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Name of test material: N4,N4'-Diphenyl-N4,N4'-di-m-tolyl-biphenyl-4,4'-diamine RXSS/91/404
Physical state: white powder
Lot/batch No.: 0119

Results and discussion

Vapour pressure
Temp.:
25 °C
Vapour pressure:
3.356 Pa

Any other information on results incl. tables

The solid sample was maintained below about 167°C during measurements & did not visibly appaer to have suffered any decomposition at the temperatures used.There was no condensation onto the balance pan at the higher temperatures. The quoted melting point is 168 -174°C.

There was removal of volatiles on initial pumping & also subsequently at the higher temperatures in Run 1 where the mass differences above 87°C dininished with time indicating further loss of volatility. In Run 2 the mass differences behaved sinilarly erratically at temperatures above 150°C. Because of the erratic behaviour reliable vapour pressure curves cannot be produced & recourse was made to obtaining an etimated value from the mass difference for the most degassed sample in Run 2 by imposing a slope of -2000 for the vapour pressure relationship. This gave the above value Vp 25°C) = 3.356 x 10 -6 Pa. This is a maximum value for regulatory purposes and should have no environmental implication.

Applicant's summary and conclusion