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Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03/AUG/04 - 19/NOV/04

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

GLP compliance:

yes

Type of method:

static method

Specific details on test material used for the study:

Asahiklin AE-3000, molecular weight 200.07
CAS 406-78-0
Clear colourless liquid
Batch 50407070
Purity: 99.985%
The test substance was stored in a refrigerator in the dark under stable conditions
The test substance expiry date was the 07 July 2005

Key result

Temp.:

20 °C

Vapour pressure:

30.78 kPa

The measured vapour pressures are their natural logarithms are summarised below and are expressed in kPa. The values given are rounded values:

36.92°C (310.07 K)			30.49°C (303.64 K)			23.31°C (296.46 K)
nr	p/kPa	Ln (p/Pa)	nr	p/kPa	Ln (p/Pa)	nr	p/kPa	Ln (p/Pa)
1*	58.86	10.98	15	46.14	10.74	24*	35.42	10.48
2*	58.61	10.98	16	46.13	10.74	25	35.27	10.47
3	58.39	10.97	17	46.14	10.74	26	35.13	10.47
4	58.29	10.97	18	46.08	10.74	27	35.06	10.46
5	58.17	10.97	19	46.10	10.74	28	34.96	10.46
6	58.11	10.97	20	46.15	10.74	29	34.90	10.46
7	58.06	10.97	21	46.10	10.74	30	34.92	10.46
8	58.03	10.97	22	46.08	10.74	31	34.90	10.46
9	57.99	10.97	23	46.07	10.74
10	57.91	10.97
11	57.9	10.97
12	57.87	10.97
13	57.85	10.97
14	57.83	10.97

 * System instability - measurement not used for calculation

Vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether at 3 different temperatures:

Measurement	Temperature		Mean vapour pressure±2 x calculated error [pa]
	[°C]	[K]	p	ln p
3-14	36.92	310.07	58033 ± 286	10.969 ± 0.005
15-23	30.49	303.64	46111 ± 51	10.739 ± 0.001
25-31	23.31	296.46	35020 ± 227	10.464 ± 0.006

 

Fitting these data using the least squares method gave a value of 30.78kPa for the vapour pressure of the test substance at 20°C.

Conclusions:

The vapour pressure for 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether was determined as:

p (20°C) = 30.8 ± 0.4kPa = 231 ± 3 mmHg

Executive summary:

An experiment was carried out to determine the vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether using the static technique.

A total of 31 measurements were made with a capacitance manometer, at temperatures of 36.92°C, 30.49°C and 23.31°C respectively. Fitting of the data obtained using the least squares method gave a value of p (20°C) = 30.8 ± 0.4kPa = 231 ± 3 mmHg for the vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether

Key value for chemical safety assessment

Vapour pressure:

30.78 kPa

at the temperature of:

20 °C