ASTM E546-08
(Test Method)Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units
Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units
SIGNIFICANCE AND USE
This test method and the apparatus described are intended primarily for sealed insulating glass units positioned horizontally. If the procedure is applied to such units in other than a horizontal position, the results may not be comparable to those obtained by this procedure.
Note 1—A similar method is Test Method E 576.
SCOPE
1.1 This test method describes a laboratory procedure for determining the frost/dew point within the air space(s) of sealed insulating glass units, and establishes the criteria for determining whether that point is below or above a given or specified temperature.
1.2 This test method also describes the apparatus to be used for these determinations.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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. For specific hazard statements, see 9.1.3.
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Designation: E546 − 08
StandardTest Method for
1
Frost/Dew Point of Sealed Insulating Glass Units
This standard is issued under the fixed designation E546; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Terminology
1.1 This test method describes a laboratory procedure for
3.1 Definitions—Fordefinitionsofgeneraltermsusedinthis
determining the frost/dew point within the air space(s) of test method, refer to Terminology E631.
sealed insulating glass units, and establishes the criteria for
3.2 Definitions of Terms Specific to This Standard:
determining whether that point is below or above a given or
3.2.1 frost state—the case where the frost/dew point of a
specified temperature.
sealed insulating glass unit is above the test temperature
1.2 This test method also describes the apparatus to be used specified by the purchaser or user.
for these determinations.
3.2.2 frost/dew point, n—the temperature at which water,
organic vapor, or other chemicals begin to appear on the
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information interiorglasssurfaceofasealedinsulatingglassunitincontact
with the measuring surface of the frost/dew-point apparatus.
only.
1.4 This standard does not purport to address all of the 3.2.3 no-frost state—the case where the frost/dew point of a
sealed insulating glass unit is below the temperature specified
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- by the purchaser or user.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific hazard 4. Summary of Test Method
statements, see 9.1.3.
4.1 This test method is conducted by the use of a special
apparatus, consisting basically of two chilled cylindrical metal
2. Referenced Documents
blocks positioned one over the other and separated by a gap of
2
2.1 ASTM Standards: controllable distance. The upper block has an exposed flat
C1036Specification for Flat Glass circular surface, 25 mm (1 in.) in diameter, and can be chilled
E77Test Method for Inspection and Verification of Ther- to far below the ice point by regulating the air-gap distance
mometers between it and the lower metal block which is maintained at
E576Test Method for Frost/Dew Point of Sealed Insulating approximately−78°C (−109°F) by dry ice. The test specimen
Glass Units in the Vertical Position is placed in contact with this chilled flat circular surface of the
E631Terminology of Building Constructions upper block for specified short periods of time, with the metal
surface at successively lower temperatures, to determine at
what temperature frost appears on the corresponding lower air
space glass surface.
1
This test method is under the jurisdiction of ASTM Committee E06 on
Performance of Buildings and is the direct responsibility of Subcommittee E06.22
on Durability Performance of Building Constructions.
5. Significance and Use
Current edition approved April 1, 2008. Published May 2008. Originally
ε1
5.1 This test method and the apparatus described are in-
approved in 1975. Last previous edition approved in 1999 as E546–88(1999) .
DOI: 10.1520/E0546-08.
tended primarily for sealed insulating glass units positioned
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
horizontally. If the procedure is applied to such units in other
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
thanahorizontalposition,theresultsmaynotbecomparableto
Standards volume information, refer to the standard’s Document Summary page on
those obtained by this procedure.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E546 − 08
NOTE 1—A similar method is Test Method E576.
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E546 − 08
6. Apparatus inserted in the upper block; a control ring; and an insulated
3 containment cylinder fitted with a retainer spring assembly.
6.1 Test Apparatus (see Fig. 1), consisting of upper and
The two metal blocks are separated by a small air gap, the
lower cylindrical metal blocks with a thermocouple, bimetallic
distance of which can be regulated by the control ring. The
thermometer, or other suitable temperature sensors being
exposedflatcircularsurfaceoftheupperblockis25mm(1in.)
indiameter;hasag
...
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.
An American National Standard
e1
Designation:E546–88(Reapproved 1999) Designation: E 546 – 08
Standard Test Method for
1
Frost/Dew Point of Sealed Insulating Glass Units
This standard is issued under the fixed designation E546; 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.
This standard has been approved for use by agencies of the Department of Defense.
1
e NOTE—Keywords were added in October 1999.
1. Scope
1.1 This test method describes a laboratory procedure for determining the frost/dew point within the air space(s) of sealed
insulating glass units, and establishes the criteria for determining whether that point is below or above a given or specified
temperature.
1.2 This test method also describes the apparatus to be used for these determinations.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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. For specific hazard statements, see Notes 2 and X1.1. For specific hazard statements, see 9.1.3.
2. Referenced Documents
2
2.1 ASTM Standards:
C1036 Specification for Flat Glass
E77 Test Method for Inspection and Verification of Thermometers
E576Test Method for Frost Point of Sealed Insulating Glass Units in Vertical Position Test Method for Frost/Dew Point of
Sealed Insulating Glass Units in the Vertical Position
E631 Terminology of Building Constructions
3. Terminology
3.1 frost point—the temperature at which visible frost begins to deposit on the lower air space glass surface of a sealed
insulating glass unit in contact with the measuring surface of the frost point apparatus. Definitions—For definitions of general
terms used in this test method, refer to Terminology E631.
3.2 frost state—the case where the frost point of a sealed insulating glass unit is above the test temperature specified by the
purchaser or user.
3.3no-frost state—the case where the frost point of a sealed insulating glass unit is below the temperature specified by the
purchaser or user. Definitions of Terms Specific to This Standard:
3.2.1 frost state—the case where the frost/dew point of a sealed insulating glass unit is above the test temperature specified by
the purchaser or user.
3.2.2 frost/dew point, n—thetemperatureatwhichwater,organicvapor,orotherchemicalsbegintoappearontheinteriorglass
surface of a sealed insulating glass unit in contact with the measuring surface of the frost/dew-point apparatus.
3.2.3 no-frost state—the case where the frost/dew point of a sealed insulating glass unit is below the temperature specified by
the purchaser or user.
4. Summary of Test Method
4.1 This test method is conducted by the use of a special apparatus, consisting basically of two chilled cylindrical metal blocks
positionedoneovertheotherandseparatedbyagapofcontrollabledistance.Theupperblockhasanexposedflatcircularsurface,
25 mm (1 in.) in diameter, and can be chilled to far below the ice point by regulating the air-gap distance between it and the lower
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE-6E06onPerformanceofBuildingsandisthedirectresponsibilityofSubcommitteeE06.22onDurability
Performance of Building Constructions.
Current edition approved March 25, 1988.April 1, 2008. Published September 1988.May 2008. Originally published as E546–75.approved in 1975. Last previous edition
e1
approved in 1999 as E546–838(1999) .
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
, Vol 15.02.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.
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E546–08
metal block which is maintained at approximately−78°C (−109°F) by dry ice. The test specimen is placed in contact with this
chilled flat circular surface of the upper block for specified short periods of time, with the metal surface at successively lower
temperatures, to determi
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