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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Only secondary literature
Qualifier:
no guideline followed
Principles of method if other than guideline:
The testing methodology is not reported in detail
GLP compliance:
not specified
Type of method:
other: glass fiber manometer
Key result
Temp.:
25 °C
Vapour pressure:
0.089 Pa
Conclusions:
The vapour pressure was found to be 0.089 Pa
Endpoint:
vapour pressure
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Only secondary literature
Principles of method if other than guideline:
The testing methodology is not reported
GLP compliance:
not specified
Key result
Temp.:
108 °C
Vapour pressure:
1 hPa
Endpoint:
vapour pressure
Type of information:
not specified
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Authoritative secondary source
Principles of method if other than guideline:
The testing methodology is not reported
GLP compliance:
not specified
Key result
Temp.:
20 °C
Vapour pressure:
0.033 Pa
Conclusions:
The vapour pressure of diphenylamine was reported to be 0.033 Pa at 20 °C
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study reported is comparable to a guideline study and cited by an authoritative secondary source
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
not applicable
GLP compliance:
yes
Type of method:
gas saturation method
Key result
Temp.:
25 °C
Vapour pressure:
0.085 Pa
Key result
Temp.:
35 °C
Vapour pressure:
0.309 Pa
Key result
Temp.:
45 °C
Vapour pressure:
0.946 Pa
Conclusions:
Relation between vapor pressure (V) and temperature (T) is LOG(V)= 0.0523T - 16.70 with T in °K.

Description of key information

The information is based on different secondary sources with consistent values for vapour pressure. Based on all data available is was possible to derive a log-linear relation between vapour pressure and temperature.

Key value for chemical safety assessment

Vapour pressure:
0.03 Pa
at the temperature of:
293 K

Additional information

Using all available data except one* the relation between vapor pressure (V) and temperature (T) is LOG(V)= 0.0562T - 18 with T in °K. Based on this relation vapour pressure at 293 °K (20 °C) is 0.030 Pa.

*The data from the MSDS of Sigma Aldrich (at 108 ˚C), as it was out of the range.