ASTM E576-14
(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
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 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.
5.2 This test method is applicable for the uncoated or un-filmed clear (transparent) glass lite of sealed insulating glass units. If this apparatus is used with coated or filmed glass lite, the coating or film on the surface of glass lite may be damaged.
5.3 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 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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 and 9.3.8.
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Designation: E576 − 14
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 U.S. Department of Defense.
1. Scope 3. Terminology
3.1 Definitions—Fordefinitionsofgeneraltermsusedinthis
1.1 This test method describes a field or laboratory proce-
test method, refer to Terminology E631.
durefordeterminingthefrost/dewpointwithintheairspace(s)
of 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/dew point—the temperature at which water, or-
specified temperature.
ganic vapor, or other chemicals begin to appear on the interior
glass surface of a sealed insulating glass unit in contact with
1.2 This test method also describes the apparatus to be used
the measuring surface of the frost/dew-point apparatus.
for these determinations.
3.2.2 frost state—the case where the frost/dew point of a
1.3 The values stated in inch-pound units are to be regarded
sealed insulating glass unit is above the test temperature
as standard. The values given in parentheses are mathematical
specified by the purchaser or user.
conversions to SI units that are provided for information only
3.2.3 no-frost state—the case where the frost/dew point of a
and are not considered standard.
sealed insulating glass unit is below the temperature specified
1.4 This standard does not purport to address all of the
by the purchaser or user.
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.1 This test method is conducted by the use of a special
bility of regulatory limitations prior to use. For specific hazard
apparatus, consisting basically of two chilled cylindrical metal
statements, see 9.1.3 and 9.3.8.
blocks positioned one over the other and separated by a gap of
controllable distance. The upper block has an exposed flat
2. Referenced Documents
circular surface, 1 in. (25 mm) in diameter, and can be chilled
2 to far below the ice point by regulating the air gap distance
2.1 ASTM Standards:
between it and the lower metal block which is maintained at
C1036Specification for Flat Glass
approximately −109°F (−78°C) by dry ice. The test specimen
E77Test Method for Inspection and Verification of Ther-
is placed in contact with this chilled flat circular surface of the
mometers
upper block for specified short periods of time, with the metal
E631Terminology of Building Constructions
surface at successively lower temperatures, to determine at
E774Specification for the Classification of the Durability of
3 what temperature frost appears on the corresponding lower air
Sealed Insulating Glass Units (Withdrawn 2006)
space glass surface.
5. Significance and Use
1
This test method is under the jurisdiction of ASTM Committee E06 on
5.1 This test method is suitable for use under actual or
Performance of Buildings and is the direct responsibility of Subcommittee E06.22
simulated in-service conditions; that is, one side of the unit is
on Durability Performance of Building Constructions.
exposed to room temperature, while the other side is exposed
Current edition approved Dec. 1, 2014. Published February 2015. Originally
approved in 1976. Last previous edition approved in 2008 as E576–08. DOI:
to natural or simulated weather conditions. Where the glazing
10.1520/E0576-14.
conditions and the 24-h history are different or changed from
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
previous conditions, the frost/dew point may not be compa-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on rable to a previous measurement.
the ASTM website.
3
5.2 This test method is applicable for the uncoated or
The last approved version of this historical standard is referenced on
www.astm.org. un-filmed clear (transparent) glass lite of sealed insulating
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E576 − 14
glassunits.Ifthisapparatusisusedwithcoatedorfilmedglass lower cylindrical metal blocks with a thermocouple, bimetallic
lite, the coating
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: E576 − 08 E576 − 14
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. A number 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 U.S. Department of Defense.
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 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 inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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 and 9.3.79.3.8.
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
3
E774 Specification for the Classification of the Durability of Sealed Insulating Glass Units (Withdrawn 2006)
3. Terminology
3.1 Definitions—For definitions of general terms used in this test method, refer to Terminology E631.
3.2 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.
3.2.1 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.
3.2.2 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.
3.2.3 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
positioned one over the other and separated by a gap of controllable distance. The upper block has an exposed flat circular 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.
Current edition approved April 1, 2008Dec. 1, 2014. Published May 2008February 2015. Originally approved in 1976. Last previous edition approved in 19992008 as
ε1
E576 – 88 (1999)E576 – 08. . DOI: 10.1520/E0576-08.10.1520/E0576-14.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E576 − 14
25 mm (1 in.)1 in. (25 mm) 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)−109°F (−78°C) 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 under actual or simulated in-service conditions; that is, on
...
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