ASTM E1782-08

Standard Test Method for Determining Vapor Pressure by Thermal Analysis

SIGNIFICANCE AND USE
Vapor pressure is a fundamental thermophysical property of a liquid. Vapor pressure data are useful in process design and control, in establishing environmental regulations for safe handling and transport, for estimation of volatile organic content (VOC), and in deriving hazard assessments. Vapor pressure and boiling temperature data are required for Material Safety Data Sheets (MSDS). The enthalpy of vaporization may also be estimated from the slope of the vapor pressure curve (See Practice E 2071).
SCOPE
1.1 This test method describes a procedure for the determination of the vapor pressure of pure liquids or melts from boiling point measurements made using differential thermal analysis (DTA) or differential scanning calorimetry (DSC) instrumentation operated at different applied pressures.  
1.2 This test method may be used for the temperature range 273 to 773 K (0 to 500 °C) and for pressures between 5 kPa to 2 MPa. These ranges may differ depending upon the instrumentation used and the thermal stability of materials tested. Because a range of applied pressures is required by this test method, the analyst is best served by use of instrumentation referred to as high pressure differential thermal instrumentation (HPDSC or HPDTA).  
1.3  
1.4 There is no ISO standard equivalent to this test method.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 29-Feb-2008
• ICS: 17.200.10 - Heat. Calorimetry
• Technical Committee: E37 - Thermal Measurements
• Drafting Committee: E37.01 - Calorimetry and Mass Loss

Relations

• Replaces: ASTM E1782-03 - Standard Test Method for Determining Vapor Pressure by Thermal Analysis
• Effective Date: 01-Mar-2008
• Referred By: ASTM E2744-21 - Standard Test Method for Pressure Calibration of Thermal Analyzers
• Effective Date: 01-Mar-2008
• Referred By: ASTM E1194-17 - Standard Test Method for Vapor Pressure
• Effective Date: 01-Mar-2008
• Referred By: ASTM E2071-21 - Standard Practice for Calculating Heat of Vaporization or Sublimation from Vapor Pressure Data
• Effective Date: 01-Mar-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1782 − 08
StandardTest Method for
1
Determining Vapor Pressure by Thermal Analysis
This standard is issued under the fixed designation E1782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E967Test Method for Temperature Calibration of Differen-
tial Scanning Calorimeters and Differential ThermalAna-
1.1 This test method describes a procedure for the determi-
lyzers
nation of the vapor pressure of pure liquids or melts from
E1142Terminology Relating to Thermophysical Properties
boiling point measurements made using differential thermal
E2071Practice for Calculating Heat of Vaporization or
analysis (DTA) or differential scanning calorimetry (DSC)
Sublimation from Vapor Pressure Data
instrumentation operated at different applied pressures.
SI10Standard for Use of the International System of Units
1.2 This test method may be used for the temperature range
(SI) The Modern Metric System
273 to 773 K (0 to 500°C) and for pressures between 5 kPa to
2 MPa. These ranges may differ depending upon the instru-
3. Terminology
mentation used and the thermal stability of materials tested.
3.1 Definitions:
Because a range of applied pressures is required by this test
3.1.1 The following terms are applicable to this test method
method, the analyst is best served by use of instrumentation
and can be found in either Terminology E473 or Terminology
referredtoashighpressuredifferentialthermalinstrumentation
E1142:boilingpressure,boilingtemperature,differentialscan-
(HPDSC or HPDTA).
ning calorimetry (DSC), differential thermal analysis (DTA),
1.3 The values stated in SI units are to be regarded as
vapor pressure, vaporization point, vaporization temperature.
standard. No other units of measurement are included in this
3.2 Symbols:
3
standard.
3.2.1 A, B, C—Antoine vapor pressure equation (1) con-
stants (log , kPa, K):
1.4 There is no ISO standard equivalent to this test method.
10
Antoinevaporpressureequation:Log P 5 A 2 B/ T1C
1.5 This standard does not purport to address all of the ~ !
10
safety concerns, if any, associated with its use. It is the
where:
responsibility of the user of this standard to establish appro-
P = vapor pressure, kPa, and
priate safety and health practices and determine the applica-
T = temperature, K.
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
4.1 A specimen in an appropriate container is heated at a
2
2.1 ASTM Standards:
constant rate within a DTAor DSC instrument operated under
E177Practice for Use of the Terms Precision and Bias in
anappliedconstantvacuum/pressurebetween5kPaand2MPa
ASTM Test Methods
until a boiling endotherm is recorded. Boiling is observed at
E473Terminology Relating to Thermal Analysis and Rhe-
thetemperaturewherethespecimenpartialpressureequalsthe
ology
pressure applied to the test chamber. The pressure is recorded
E691Practice for Conducting an Interlaboratory Study to
during observance of the boiling endotherm and the boiling
Determine the Precision of a Test Method
temperature is recorded as the extrapolated onset temperature.
Thismeasurementisrepeatedusingnewspecimensforeachof
five or more different pressures covering the pressure range of
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
interest. The pressure-temperature data are fitted as Log P
10
Measurements and is the direct responsibility of Subcommittee E37.01 on Calo-
−1
and 1/T(K ) to theAntoine vapor pressure equation (see Fig.
rimetry and Mass Loss.
1). Vapor pressure values required for specific reports are then
Current edition approved March 1, 2008. Published June 2008. Originally
approved in 1996. Last previous edition approved in 2003 as E1782–03. DOI:
computed from the derived equation.
10.1520/E1782-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The boldface numbers given in parentheses refer to a list of references at the
the ASTM website. end of the text.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E1782 − 08
significantly broadened endotherm, or both, and shall not be
consideredavalidpressure-temperaturedatumpoint.Useofan
inert gas for elevated pressures or for back-filling after evacu-
ation of the sample chamber is recommended to minimize the
risk of oxidation.
6.3 Partial blockage of the pinhol
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E 1782–03 Designation:E 1782–08
Standard Test Method for
1
Determining Vapor Pressure by Thermal Analysis
This standard is issued under the fixed designation E 1782; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 Thistestmethoddescribesaprocedureforthedeterminationofthevaporpressureofpureliquidsormeltsfromboilingpoint
measurementsmadeusingdifferentialthermalanalysis(DTA)ordifferentialscanningcalorimetry(DSC)instrumentationoperated
at different applied pressures.
1.2 This test method may be used for the temperature range 273 to 773 K (0 to 500°C) and for pressures between 5 kPa to 2
MPa. These ranges may differ depending upon the instrumentation used and the thermal stability of materials tested. Because a
range of applied pressures is required by this test method, the analyst is best served by use of instrumentation referred to as high
pressure differential thermal instrumentation (HPDSC or HPDTA).
1.3Computer or electronic-based instruments, techniques, or data treatment equivalent to this test method may also be used.
NOTE1—Users of this test method are expressly advised that all such instruments or techniques may not be equivalent. It is the responsibility of the
user of this test method to determine the necessary equivalency prior to use. Only the manual procedures are to be considered valid.
1.4SI value units are the standard. The customary units given in parentheses are for information only.
1.5There is no ISO standard equivalent to this test method.
1.6This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
1.3
1.4 There is no ISO standard equivalent to this test method.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E473 Terminology Relating to Thermal Analysis and Rheology
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method 2
2
E967PracticeforTemperatureCalibrationofDifferentialScanningCalorimeters/DifferentialThermalAnalyzers TestMethod
for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
E1142 Terminology Relating to Thermophysical Properties
E2071 Practice for Calculating Heat of Vaporization or Sublimation from Vapor Pressure Data
SI10 Standard for Use of the International System of Units (SI) The Modern Metric System
3. Terminology
3.1 Definitions:
3.1.1 The following terms are applicable to this test method and can be found in either Terminology E473 or Terminology
E1142: boiling pressure, boiling temperature, differential scanning calorimetry (DSC), differential thermal analysis (DTA), vapor
pressure, vaporization point, vaporization temperature.
3.2 Symbols:
1
This test method is under the jurisdiction ofASTM Committee E37 onThermal Measurements and is the direct responsibility of Subcommittee E37.01 onThermalTest
Methods and Recommended Practices.
CurrenteditionapprovedMarch10,2003.1,2008.PublishedApril2003.June2008.Originallyapprovedin1996.Lastpreviouseditionapprovedin19982003asE1782–98.
E1782–03.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail]ards
, Vol 14.02.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E 1782–08
3
3.2.1 A, B, C—Antoine vapor pressure equation (1) constants (log , kPa, K):
10
Antoine vapor pressure equation:Log P 5 A 2B/~T 1 C!
10
where:
P = vapor pressure, kPa, and
T = temperature, K.
4. Summary of Test Method
4.1 A specimen in an appropriate container is heated at a constant rate within a DTA or DSC i
...