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Physical & Chemical properties

Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2008
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study was carefully performed using standard instrumentation according to an ASTM method. However, the OECD method specifies somewhat different procedures than the ASTM method, and it was not conducted in accord with GLP guidelines.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Report date:
2008

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: ASTM E1719-97 (Vapor Pressure Measurement by Ebulliometry) and ASTM D1120-94 (Standard Test Method for Boiling Point of Engine Coolants)
Deviations:
not specified
GLP compliance:
no
Type of method:
dynamic method

Test material

Constituent 1
Reference substance name:
MeDONA
IUPAC Name:
MeDONA
Details on test material:
- Name of test material (as cited in study report): CF3OC3F6OCFHCF2COOCH3 PF13 Methyl Ester
- Lot/batch no.: 146830-84

Results and discussion

Vapour pressure
Temp.:
20 °C
Vapour pressure:
0.2 kPa

Any other information on results incl. tables

The temperatures measured were that of the pot temperature, rather than distillate, as per ASTM E1719-97 (Vapor Pressure Measurement by Ebulliometry). Figure 1. (Vapor Pressure 1) --> SEE ATTACHMENT 1

The data are fit by the Antoine equation:

ln(Pvap) = A / (T + C) + B

Figure 2. (Vapor Pressure 2) (ln(Pvap) vs 1/(T+C)) --> SEE ATTACHMENT 2

Pvap (mm Hg) = exp(-2686.380034/(T °C + 160) + 15.311790) R²=0.998973 The value of the factor C was determined to be 160 by an iterative correction process. The vapor pressure obtained from this equation is 0.20 Pa (1.47 mm Hg) at 20 °C (68 °F).

Applicant's summary and conclusion

Conclusions:
The extrapolated vapor pressure of MeDONA was determined to be 0.20 kPa at 20 °C
Executive summary:

The vapor pressure of MeDONA was extrapolated from the measured vapor pressures and temperatures for the compound. Measurements were made according to method ASTM E1719-97. Vapor pressure and temperature were measured at a variety of equilibrium points covering a temperature range of ca. 40 °C to ca. 150 °C and fit to the Antoine equation ln(VP) = A/(T+C)+B, where T is the pot temperature in °C. The linear regression equation was VP = exp(-2686.380034/(T °C + 160) + 15.311790). The extrapolated vapor pressure of MeDONA at 20 °C (68 °F) was determined to be 0.20 kPa (1.47 mm Hg).

The study was conducted under method ASTM E1719-97 (Vapor Pressure of Liquids by Ebulliometry). The dynamic method is approved for this endpoint per OECD TG 104§8, however the OECD method specifies somewhat different procedures than the ASTM method. The study was not conducted in accord with GLP guidelines. Therefore, the study is classified as acceptable with restrictions.