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Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reason / purpose for cross-reference:

read-across source

Key result

Temp.:

25 °C

Vapour pressure:

1.6 Pa

Temp.:

15 °C

Vapour pressure:

0.66 Pa

Remarks on result:

other: The test material did not change in appearance under the conditions used in the determination

Results of Vapour Pressure Measurements (Run 1 - 4):

Table 1. Run 1

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (μg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
6	279.15	0.003582303	220.05	2.201E-07	0.305485776	-0.515009006
7	280.15	0.003569516	239.82	2.398E-07	0.332931602	-0.477644980
8	281.15	0.003556820	256.20	2.562E-07	0.355671238	-0.448951253
9	282.15	0.003544214	290.54	2.905E-07	0.403343956	-0.394324447
10	283.15	0.003531697	316.30	3.163E-07	0.439105436	-0.357431187
11	284.15	0.003519268	339.97	3.400E-07	0.471965460	-0.326089783
12	285.15	0.003506926	383.60	3.836E-07	0.532535078	-0.273651780
13	286.15	0.003494671	422.44	4.224E-07	0.586454949	-0.231765345
14	287.15	0.003482500	452.79	4.528E-07	0.628588524	-0.201633552
15	288.15	0.003470415	496.32	4.963E-07	0.689019316	-0.161768603

Regression Line: Slope = -3212.834 Intercept = 10.989 R²=0.9977

Table 2. Run 2

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (μg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
5	278.15	0.003595182	191.30	1.913E-07	0.265573411	-0.575815409
6	279.15	0.003582303	207.47	2.075E-07	0.288021514	-0.540575072
7	280.15	0.003569516	233.03	2.330E-07	0.323505342	-0.490118544
8	281.15	0.003556820	248.01	2.480E-07	0.344301420	-0.463061186
9	282.15	0.003544214	271.47	2.715E-07	0.376869910	-0.423808536
10	283.15	0.003531697	298.73	2.987E-07	0.414713774	-0.382251540
11	284.15	0.003519268	329.88	3.299E-07	0.457957955	-0.339174393
12	285.15	0.003506926	371.42	3.714E-07	0.515626117	-0.287665093
13	286.15	0.003494671	408.26	4.083E-07	0.566769476	-0.246593547
14	287.15	0.003482500	439.91	4.399E-07	0.610707784	-0.214166544

Regression Line: Slope = -3261.044 Intercept = 11.142 R²=0.9972

Table 3. Run 3

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (μg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
5	278.15	0.003595182	188.01	1.880E-07	0.261006048	-0.583349429
6	279.15	0.003582303	198.49	1.985E-07	0.275554973	-0.559791747
7	280.15	0.003569516	223.95	2.240E-07	0.310899976	-0.507379312
8	281.15	0.003556820	245.02	2.450E-07	0.340150534	-0.468328843
9	282.15	0.003544214	261.99	2.620E-07	0.363709241	-0.439245664
10	283.15	0.003531697	302.63	3.026E-07	0.420127973	-0.376618401
11	284.15	0.003519268	330.88	3.309E-07	0.459346211	-0.337859862
12	285.15	0.003506926	366.13	3.661E-07	0.508282242	-0.293895063
13	286.15	0.003494671	391.39	3.914E-07	0.543349594	-0.264920653
14	287.15	0.003482500	432.02	4.320E-07	0.599754443	-0.222026526
15	288.15	0.003470415	462.37	4.624E-07	0.641888019	-0.192540731

Regression Line: Slope = -3266.778 Intercept = 11.153 R²=0.9965

Table 4. Run 4

Temperature (ºC)	Temperature (K)	Reciprocal Temperature (K^-1)	Mass Difference (μg)	Mass Difference (kg)	Vapour Pressure (Pa)	Log10Vp
5	278.15	0.003595182	181.62	1.816E-07	0.252135091	-0.598366707
6	279.15	0.003582303	202.98	2.030E-07	0.281788243	-0.550077131
7	280.15	0.003569516	218.76	2.188E-07	0.303694926	-0.517562464
8	281.15	0.003556820	244.02	2.440E-07	0.338762278	-0.470104956
9	282.15	0.003544214	262.29	2.623E-07	0.364125718	-0.438748646
10	283.15	0.003531697	295.94	2.959E-07	0.410840539	-0.386326709
11	284.15	0.003519268	320.30	3.203E-07	0.444658460	-0.351973440
12	285.15	0.003506926	353.75	3.538E-07	0.491095630	-0.308833930
13	286.15	0.003494671	395.98	3.960E-07	0.549721690	-0.259857127
14	287.15	0.003482500	428.83	4.288E-07	0.595325906	-0.225245219
15	288.15	0.003470415	476.85	4.769E-07	0.661989968	-0.179148592

Regression Line: Slope = -3335.221 Intercept = 11.391 R²=0.9988

Table 5. Summary of Results

Run	LogPa (25ºC)
1	0.213
2	0.205
3	0.196
4	0.204
Mean	0.205
Vapour Pressure	1.6 Pa

Conclusions:

The vapour pressure of the test substance is 1.6 Pa at 25 deg. C. The test substance did not change in appearance under the conditions of the test.

Executive summary:

The vapour pressure of the test substance was determined by a vapour pressure balance method according to EU Method A.4. Four replicate tests were performed. Temperature and pressure readings were taken between 5 and 15 deg. C. A plot of logPa vs. 1/K (reciprocal temperature) was constructed from experimental data from which the vapour pressure at 25 deg. C was extrapolated.

The test substance did not change in appearance under the conditions of the test.

The vapour pressure of the test substance, determined from the mean of 4 separate measurements is 1.60 Pa at 25 deg. C:

Summary of Vapour Pressure Measurements

Run	LogPa (25ºC)
1	0.213
2	0.205
3	0.196
4	0.204
Mean	0.205
Vapour Pressure	1.6 Pa

Description of key information

The vapour pressure of the test substance is 1.6 Pa at 25 deg. C.The test substance did not change in appearance under the conditions of the test.

Key value for chemical safety assessment

Vapour pressure:

1.6 Pa

at the temperature of:

25 °C