Hydrocarbons, C9-C11, n-alkanes, isoalkanes,

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The study was conducted in accordance with relevant test method but not in compliance with GLP.

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

not specified

GLP compliance:

no

Type of method:

dynamic method

Temp.:

20 °C

Vapour pressure:

140 Pa

Temp.:

25 °C

Vapour pressure:

205 Pa

Temp.:

50 °C

Vapour pressure:

1 020 Pa

Tab. 1 Experimental vapour pressure data for GTL Solvent GS 180

T / K	Pexp/ kPa	Pcalc/ kPa	1-Pexp/Pcalc
309.73	0.445	0.450	1.09%
316.51	0.692	0.687	-0.73%
321.91	0.974	0.945	-3.03%
331.47	1.61	1.61	-0.10%
340.49	2.54	2.55	0.37%
351.71	4.34	4.33	-0.31%
357.94	5.65	5.70	0.86%
366.70	8.30	8.22	-1.02%
377.57	12.50	12.53	0.27%
387.95	18.13	18.21	0.46%
400.99	28.16	28.11	-0.19%
409.36	36.58	36.45	-0.36%
421.60	51.61	52.03	0.80%
432.95	70.98	70.76	-0.31%
446.07	98.65	98.45	-0.20%

 

Tab. 2a Antoine parameters of the pure components:

DDB format: log (P/Torr) = A – B / (C + T/°C)

Component	A	B	C
GTL Solvent GS180	6.58632	1312.26	180.032

 

Tab. 2b Antoine parameters of the pure components:

Aspen format: ln (P/Torr) = A + B / (C + T/°C)

Component	A	B	C
GTL Solvent GS180	15.1656	-3021.59	180.032

 

 

Conclusions:

Vapour pressure values of 140 Pa, 205 Pa and 1020 Pa at 20°C, 25°C and 50°C respectively were determined for the substance using a relevant test method. The result is considered reliable.

Executive summary:

Vapour pressure values of 140 Pa, 205 Pa and 1020 Pa at 20°C, 25°C and 50°C respectively were determined for the substance using a relevant test method. The result is considered reliable.

Description of key information

Vapour pressure (whole substance): 140 Pa, 205 Pa and 1020 Pa at 20°C, 25°C and 50°C respectively
Vapour pressure (individual constituents): 2.8E+01 Pa to 3.1E+03 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:

140 Pa

at the temperature of:

20 °C

Additional information

In an OECD 104 study using the dynamic methods, which was conducted in compliance with GLP, Hydrocarbons, C9-C11, n-alkanes, isoalkanes, <2% aromatics (GTL Solvent GS180) has measured vapour pressure values of 140 Pa at 20°C, 205 Pa at 25°C and 1020 Pa at 50°C. The result is considered to be reliable and is used as key study.

Since the submission substance is a UVCB substance, the vapour pressures of the individual constituents are also important. Measured vapour pressure for the whole substance is preferred for the purpose of human health exposure assessment while the vapour pressure of individual constituents is useful for environmental risk characterisation.

This endpoint can be characterised using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with QSAR software (see IUCLID Section 13).

As supporting information, vapour pressure of the individual constituents was determined using a validated QSAR estimation method. Vapour pressures in the range 2.8E+01 to 3.1E+03 Pa at 25°C were determined for the constituents of the submission ubstance.