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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

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Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Study period:
2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Justification for type of information:
Data comes from an online compilation using QSAR model. There is no experimental study reference, however data provide from validated model.
No study was conducted on the oil iself, as not relevant for an UVCB. Literature provided data for the five major components representing about 82.4%. P-Cymene content of the UVCB is about 16%
Qualifier:
according to guideline
Guideline:
other: EPI Suite
Version / remarks:
v4.11
Principles of method if other than guideline:
QSAR method
GLP compliance:
not specified
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 1.14 mm Hg
Remarks on result:
other: (Mean VP of Antoine & Grain methods)
Conclusions:
The vapour pressure of p-cymene is 1.14 mmHg at 25°C.
Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Study period:
2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
Justification for type of information:
Data comes from an online compilation using QSAR model. There is no experimental study reference, however data provide from validated model.
No study was conducted on the oil iself, as not relevant for an UVCB. Literature provided data for the five major components representing about 82.4%. Thymol content of the UVCB is about 51%
Qualifier:
according to guideline
Guideline:
other: EPI Suite
Version / remarks:
v4.11
Principles of method if other than guideline:
QSAR method
GLP compliance:
not specified
Key result
Test no.:
#1
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0.017 mm Hg
Conclusions:
The vapour pressure of thymol is 0.0167 mmHg at 25°C.

Description of key information

Literature provided data for the 5 major components representing about 82.4% of the UVCB :

Consituent Name   CAS Number  Vapour pressure at 25°C  Source
 Thymol (at 51%)  89-83-8  0.0167 mmHg  EPI Suite v4.11
 P-Cymene (at 16%)  99-87-6  1.14 mmHg  EPI Suite v4.11
 Gamma-terpinene (at 8.7%)  99 -85 -4  1.09 mmHg  EPI Suite v4.11
 Linalol (at 3.6%)  79 -70 -6  0.0832 mmHg  EPI Suite v4.10
 Carvacrol (at3.1%)  499 -75 -2  0.0232 mmHg EPI Suite v4.11 

Key value for chemical safety assessment

Additional information

No study was conducted on the oil itself, as not relevant for an UVCB.

The vapour pressure of the test item is estimated between 0.0167 mmHg and 1.14 mmHg.

As no CSA is required for the tonnage band of concern, no key value was retained.