Hexafluoropropene, oxidized, oligomers, reduced, fluorinated

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

1992

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

according to guideline

Guideline:

other: Solvay Internal Method

Deviations:

no

Principles of method if other than guideline:

The vapor pressure is read and recorded by a pressure indicator after Galden Low Molecular Weight has been completely degassed. Experimental vapor pressure curves have been identified on the basis of measurements repeated at different temperatures.
A Druck model pressure trasducer was used for the measurements.


Apparatus:
- Chambre furnace mod. HERAEUS thermocontrollable between -40°C and +180°C
- 250cc steel vessel 100 atm
- Vaacum pump EDWARDS
- Pressure transducer Mod. Druck
- Pressure indicator Mod. Druck
- Thermocouple and temperature digital reader
- Degassing tank with coolant and heating.

See the attached scheme for details.


Test System
100cc of Galden Low Molecular Weight are loadead in the degassing tank and connected with the steel vessel. The fluid is heated until boiling point and kept under total reflux for 10 minutes in order to eliminate air. Then 60cc of the test item are loaded in the measuring vessel, kept in the thermostated furnace.
Measurements are performed by adjusting the temperature and reading the relevant pressure.

GLP compliance:

no

Type of method:

isoteniscope

Temp.:

20 °C

Vapour pressure:

ca. 221.7 Torr

Remarks on result:

other: Batch G76, HT 55

Temp.:

20 °C

Vapour pressure:

ca. 111.64 Torr

Remarks on result:

other: Batch G30, HT 70

Experimental vapor pressure curves have been identified on the basis of measurements repeated at different temperatures.

Curves are reported in the attached file.

The experimental values for the two different batches are reported in the following tables.

The values of vapour pressure at 20 °C are calculated by interpolation.

HT 55
Temperature ( °C )	Pressure (Torr)	Remarks
-20,00	27,75
-10,00	52,13
0,80	85,50
9,00	136,42
19,00	211,12
20,00	221,70	Calculated value
29,20	318,97
39,40	464,10
49,00	662,77
54,20	760,00

HT 70
Temperature ( °C )	Pressure (Torr)	Remarks
-20,20	5,65
-10,20	16,80
-0,40	35,03
9,40	63,90
19,80	110,25
20,00	111,64	Calculated value
29,20	175,65
39,20	273,00
49,60	407,00
59,20	579,50
65,20	716,47
67,20	760,00

Conclusions:

The Vapour Pressure of Galden LMW is in the renage between 112 and 222 Torr.

Executive summary:

A reliable study conducted according an internal method is reported.

The study was conducted in order to determine the vapour pressure of some fluids of the perfluorpolyether GALDEN family. GALDEN LMW was one on the tested fluid.

Measurements were conducted according to an internal method, specifically developed for GALDEN fluids, in order to eliminate inaccuracies due to degassing difficulty of the test item. A pressure trasducer (Druck model) was used for the measurements, experimental vapor pressure curves have been identified on the basis of measurements repeated at different temperatures. Experimental curves are reported in the attachement.

The vapour pressure value at 20 °C were calculated by interpolation.

Two batches of GALDEN LMW were analized, the following value derived:

- Batch G76 (GALDEN HT55): VP = 221,70 Torr at 20 °C   

- Batch G30 (GALDEN HT70): VP = 111,64 Torr at 20 °C  

      

Galden LMW is a multi-constituent substance, the Vapour Pressure variability is consistent with the potential difference in concentration of the individual constituents.

In conclusion the Vapour pressure of Galden LMW is between 112 and 222 Torr.

Reference 2

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

1994

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No details on test method are given, however the data source is authoritative and reliable

Reason / purpose for cross-reference:

reference to same study

GLP compliance:

no

Type of method:

other: not reported

Temp.:

25 °C

Vapour pressure:

165 mm Hg

Conclusions:

The reported Vapour Pressure value for GALDEN LMW is 165 mmHg at the temperature of 25 °C.

Executive summary:

The scope of the publication was to analyse perfluoropolyethers (PFPEs) from the point of view of their intriguing synthetic chemistry, properties, derivates, and applications. The focus of the publication is on PFPE fluids commercially named FOMBLIN and GALDEN and the information gleaned from first-hand experience are reported. FOMBLIN and GALDEN belong to the same class of PFPEs, the main difference between the two families is the molecular weight since GALDEN represents the low molecular weight fraction of FOMBLIN. Both of FOMBLIN and GALDEN are fluids at standard conditions.

In the publication the chemical and physical properties of several commercial products of the GALDEN family are reported. GALDEN LMW, which itself represents the low molecular weight fraction of the GALDEN family is also described with the commercial name of GALDEN HT 70.

The vapour pressure of GALDEN LMW, experimentally determined, is reported to be 165 mmHg at 25 °C.

Reference 3

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The source is authoritative and the results are considered reliable.

Remarks:

The Author is the Global Technical Marketing Manager of the product.

Qualifier:

equivalent or similar to guideline

Guideline:

other: ASTM D2879

Deviations:

yes

Remarks:

the fluid is degassed before measuring its vapour pressure.

Principles of method if other than guideline:

The method is a modification of ASTM D2879 method by degassing fluid before measuring its vapor pressure.
Repeatability error of this method is within 5%.

GLP compliance:

no

Type of method:

isoteniscope

Specific details on test material used for the study:

GALDEN HT55
GALDEN HT70

Key result

Temp.:

20 °C

Vapour pressure:

238 hPa

Remarks on result:

other: Tested sub: GALDEN HT55

Key result

Temp.:

20 °C

Vapour pressure:

147 hPa

Remarks on result:

other: Tested sub: GALDEN HT70

The reported values are based on internal historical experimental measurements.

Conclusions:

The vapour pressure of GALDEN LMW ranges between 147 and 238 hPa

Executive summary:

The statement reports the typical values of GALDEN LMW vapour pressure, basing on internal experimental measurements. The used method is an adaptation on ASTM D2879 method.

At 20°C, the value of vapour pressure of Galden® HT55 and Galden® HT70 is the following:

• Galden® HT55 = 179 Torr = 238 hPa

• Galden® HT70 = 111 Torr = 147 hPa

Galden LMW is a multi-contituent substance. The vapour pressure variability is consistent with the difference in

concentration of the individual constituents.

Description of key information

The vapour pressure of Galden LMW ranges between 147 and 296 hPa at temperature of 20 °C depending on difference in concentration of the individual constituents.

The mean value of vapour pressure = 192.5 hPa (20°C) has been set as key value for risk assessment purpose.

Key value for chemical safety assessment

Vapour pressure:

192.5 hPa

at the temperature of:

20 °C

Additional information

Three reliable references are reported.

The key reference reports the typical vapour pressure values for GALDEN LMW basing on historical experimental internal measurements carried out according to the internal method (modified ASTM D2879 method which takes into account adaptations for volatile substances).

The typical values of vapor pressure at 20°C of Galden LMW are the following:

Galden HT55: VP = 238 hPa

Galden HT70: VP = 147 hPa

 

In the supporting study, two batches of GALDEN LMW (Galden HT55 and Galden HT70) were analyzed and experimental vapor pressure curves were identified on the basis of several measurements at different temperatures. Basing on experimental curves, the following values of vapour pressure were calculated at the temperature of 20°C:

Galden HT55: VP = 296 hPa

Galden HT70: VP = 149 hPa

 

A further supporting study reports that the vapour pressure of GALDEN LMW (GALDEN HT70) is = 220.0 hPa at 25 °C.

All the reported values are consistent.

Galden LMW is a multi-constituent substance, the vapour pressure variability is consistent with the difference in concentration of the individual constituents and with the experimental error associated to the measures.

The mean value of vapour pressure = 192.5 hPa (20°C) of GALDEN HT55 and GALDEN HT70 from the key reference has been set as key value for risk assessment purpose.