ASTM E576-08
(Test Method)Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units in the Vertical Position
Standard Test Method for Frost/Dew Point of Sealed Insulating Glass Units in the Vertical Position
SIGNIFICANCE AND USE
This test method is suitable for use under actual or simulated in-service conditions; that is, one side of the unit is exposed to room temperature, while the other side is exposed to natural or simulated weather conditions. Where the glazing conditions and the 24-h history are different or changed from previous conditions, the frost/dew point may not be comparable to a previous measurement.
This test method is applicable for the uncoated or unfilmed clear (transparent) glass pane of sealed insulating glass units. If this apparatus is used with coated or filmed glass pane, the coating or film on the surface of glass pane may be damaged.
This test method may require minor modifications to keep the measuring surface of the frost/dew-point apparatus in contact with the glass if the insulating glass unit is not in the true vertical position.
SCOPE
1.1 This test method describes a field or 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 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 and 9.3.7.
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Designation: E576 − 08
Standard Test Method for
Frost/Dew Point of Sealed Insulating Glass Units in the
1
Vertical Position
This standard is issued under the fixed designation E576; 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 3.2.1 frost state—the case where the frost/dew point of a
sealed insulating glass unit is above the test temperature
1.1 This test method describes a field or laboratory proce-
specified by the purchaser or user.
durefordeterminingthefrost/dewpointwithintheairspace(s)
of sealed insulating glass units and establishes the criteria for
3.2.2 frost/dew point—the temperature at which water, or-
determining whether that point is below or above a given or
ganic vapor, or other chemicals begin to appear on the interior
specified temperature.
glass surface of a sealed insulating glass unit in contact with
the measuring surface of the frost/dew-point apparatus.
1.2 This test method also describes the apparatus to be used
for these determinations.
3.2.3 no-frost state—the case where the frost/dew point of a
1.3 This standard does not purport to address all of the sealed insulating glass unit is below the temperature specified
safety concerns, if any, associated with its use. It is the by the purchaser or user.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use. For specific hazard
4.1 This test method is conducted by the use of a special
statements, see 9.1.3 and 9.3.7.
apparatus, consisting basically of two chilled cylindrical metal
blocks positioned one over the other and separated by a gap of
2. Referenced Documents
controllable distance. The upper block has an exposed flat
2
2.1 ASTM Standards:
circular surface, 25 mm (1 in.) in diameter, and can be chilled
C1036Specification for Flat Glass
to far below the ice point by regulating the air gap distance
E77Test Method for Inspection and Verification of Ther-
between it and the lower metal block which is maintained at
mometers
approximately −78°C (−109°F) by dry ice. The test specimen
E631Terminology of Building Constructions
is placed in contact with this chilled flat circular surface of the
E774Specification for the Classification of the Durability of
upper block for specified short periods of time, with the metal
3
Sealed Insulating Glass Units (Withdrawn 2006)
surface at successively lower temperatures, to determine at
what temperature frost appears on the corresponding lower air
3. Terminology
space glass surface.
3.1 Definitions—Fordefinitionsofgeneraltermsusedinthis
test method, refer to Terminology E631. 5. Significance and Use
3.2 Definitions of Terms Specific to This Standard:
5.1 This test method is suitable for use under actual or
simulated in-service conditions; that is, one side of the unit is
exposed to room temperature, while the other side is exposed
1
This test method is under the jurisdiction of ASTM Committee E06 on
to natural or simulated weather conditions. Where the glazing
Performance of Buildings and is the direct responsibility of Subcommittee E06.22
conditions and the 24-h history are different or changed from
on Durability Performance of Building Constructions.
previous conditions, the frost/dew point may not be compa-
Current edition approved April 1, 2008. Published May 2008. Originally
ε1
approved in 1976. Last previous edition approved in 1999 as E576–88(1999) . rable to a previous measurement.
DOI: 10.1520/E0576-08.
2
5.2 This test method is applicable for the uncoated or
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
unfilmed clear (transparent) glass pane of sealed insulating
Standards volume information, refer to the standard’s Document Summary page on
glassunits.Ifthisapparatusisusedwithcoatedorfilmedglass
the ASTM website.
3
pane, the coating or film on the surface of glass pane may be
The last approved version of this historical standard is referenced on
www.astm.org. damaged.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E576 − 08
Parts List
Part No. Nomenclature Part No. Nomenclature
1 front metal block 12 supporting ring, bottom of
inner tube
2 rear metal block 13 control ring
3 top cover 14 cover lid, inner tube
4 supporting plate, front metal 15 elbow
b
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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.
e1
Designation:E576–88(Reapproved 1999) Designation: E 576 – 08
Standard Test Method for
Frost/Dew Point of Sealed Insulating Glass Units in the
1
Vertical Position
This standard is issued under the fixed designation E576; 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 field or laboratory procedure for determining the frost/dew point within the air space(s) of
sealed insulating glass units,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 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 29.1.3 and 9.3.7.
2. Referenced Documents
2
2.1 ASTM Standards:
C1036 Specification for Flat Glass
E77 Test Method for Inspection and Verification of Thermometers
E631 Terminology of Building Constructions
E774Specification for Sealed Insulating Glass Units Specification for the Classification of the Durability of Sealed Insulating
Glass Units
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—the temperature at which water, organic vapor, or other chemicals begin to appear on the interior glass
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,
1
This test method is under the jurisdiction of the ASTM Committee E-6E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.22 on
Durability Performance of Building Constructions.
Current edition approved March 25, 1988.April 1, 2008. Published September 1988.May 2008. Originally published as E576–76.approved in 1976. Last previous edition
e1
approved in 1999 as E576–788(1999) .
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.ForAnnualBookofASTMStandards
, 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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E576–08
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
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 determine at what temperature frost appears on the corresponding lower air space glass surface.
5. Significance and Use
5.1 This test method is suitable for use unde
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