Fatty acids, tall-oil, reaction products with linseed oil, maleic anhydride and methanol

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

Justification for type of information:

Guideline method conducted in a reliable laboratory within the spirit of GLP, but without CLP certification.

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

GLP compliance:

no

Type of method:

effusion method: Knudsen cell

Key result

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

0.006 Pa

Key result

Test no.:

#2

Temp.:

25 °C

Vapour pressure:

0.007 Pa

The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):

Table10-a       Experimentally Determined VapourPressures

 

T	T	P	Stand. Dev. P	RSD P
°C	K	Pa	Pa	%
45.0	318.2	1.72E-02	2.16E-03	12.5%
60.0	333.2	3.00E-02	3.45E-03	11.5%
75.0	348.2	5.14E-02	3.44E-03	6.7%

In this table, E-03 represents * 10-3.

 

The linear regression of log p vs. 1/T gave a correlation coefficient r of - 0.9999, showing good repeatability and precision. Therefore, the determination is considered as valid.

Conclusions:

The experimental vapour pressure of the test substance was 5.79E-003 Pa at 20 °C.

Description of key information

0.00579 Pa at 20 °C

Key value for chemical safety assessment

Vapour pressure:

0.006 Pa

at the temperature of:

20 °C