ASTM E1782-03

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 Computer or electronic-based instruments, techniques, or data treatment equivalent to this test method may also be used.
Note 1—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.
1.4 SI value units are the standard. The customary units given in parentheses are for information only.
1.5 There is no ISO standard equivalent to this test method.
1.6 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: 09-Mar-2003
• ICS: 17.200.10 - Heat. Calorimetry
• Technical Committee: E37 - Thermal Measurements
• Drafting Committee: E37.01 - Calorimetry and Mass Loss

Relations

• Replaces: ASTM E1782-98 - Standard Test Method for Determining Vapor Pressure by Thermal Analysis
• Effective Date: 10-Mar-2003
• Replaced By: ASTM E1782-08 - Standard Test Method for Determining Vapor Pressure by Thermal Analysis
• 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: 10-Mar-2003
• Referred By: ASTM E2744-21 - Standard Test Method for Pressure Calibration of Thermal Analyzers
• Effective Date: 10-Mar-2003
• Referred By: ASTM E1194-17 - Standard Test Method for Vapor Pressure
• Effective Date: 10-Mar-2003

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:E 1782–03
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope E967 Practice for Temperature Calibration of Differential
2
Scanning Calorimeters/Differential Thermal Analyzers
1.1 This test method describes a procedure for the determi-
E1142 Terminology Relating to Thermophysical Proper-
nation of the vapor pressure of pure liquids or melts from
2
ties
boiling point measurements made using differential thermal
E2071 Practice for Calculating Heat of Vaporization or
analysis (DTA) or differential scanning calorimetry (DSC)
2
Sublimation from Vapor Pressure Data
instrumentation operated at different applied pressures.
SI10 Standard for Use of the International System of Units
1.2 This test method may be used for the temperature range
3
(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: boiling pressure, boiling temperature, differential
(HPDSC or HPDTA).
scanning calorimetry (DSC), differential thermal analysis
1.3 Computer or electronic-based instruments, techniques,
(DTA), vapor pressure, vaporization point, vaporization tem-
or data treatment equivalent to this test method may also be
perature.
used.
3.2 Symbols:
4
NOTE 1—Users of this test method are expressly advised that all such
3.2.1 A, B, C—Antoine vapor pressure equation (1) con-
instrumentsortechniquesmaynotbeequivalent.Itistheresponsibilityof
stants (log , kPa, K):
10
the user of this test method to determine the necessary equivalency prior
Antoine vapor pressure equation:Log P 5 A 2B/ T 1 C!
to use. Only the manual procedures are to be considered valid. ~
10
1.4 SI value units are the standard. The customary units
where:
given in parentheses are for information only.
P = vapor pressure, kPa, and
1.5 There is no ISO standard equivalent to this test method.
T = temperature, K.
1.6 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 A specimen in an appropriate container is heated at a
priate safety and health practices and determine the applica-
constant rate within a DTAor DSC instrument operated under
bility of regulatory limitations prior to use.
anappliedconstantvacuum/pressurebetween5kPaand2MPa
until a boiling endotherm is recorded. Boiling is observed at
2. Referenced Documents
thetemperaturewherethespecimenpartialpressureequalsthe
2.1 ASTM Standards:
pressure applied to the test chamber. The pressure is recorded
E177 Practice for Use of the Terms Precision and Bias in
during observance of the boiling endotherm and the boiling
2
ASTM Test Methods
temperature is recorded as the extrapolated onset temperature.
2
E473 Terminology Relating to Thermal Analysis
Thismeasurementisrepeatedusingnewspecimensforeachof
E691 Practice for Conducting an Interlaboratory Study to
five or more different pressures covering the pressure range of
2
Determine the Precision of a Test Method
interest. The pressure-temperature data are fitted as Log P
10
−1
and 1/T(K ) to theAntoine vapor pressure equation (see Fig.
1). Vapor pressure values required for specific reports are then
1 computed from the derived equation.
ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
Measurements and is the direct responsibility of Subcommittee E37.01 on Test
Methods and Recommended Practices.
3
Current edition approved March 10, 2003. Published April 2003. Originally Annual Book of ASTM Standards, Vol 14.04.
4
approved in 1996. Last previous edition approved in 1998 as E1782–98. The boldface numbers given in parentheses refer to a list of references at the
2
Annual Book of ASTM Standards, Vol 14.02. end of the text.
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E 1782–03
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