ASTM C1258-08
(Test Method)Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
SIGNIFICANCE AND USE
On sub-ambient temperature systems, humid ambient conditions cause a vapor driving force toward the insulation which, if not retarded, is detrimental to the insulation's thermal resistance. Therefore a vapor retarder should resist degradation. Degradation in this test method is induced by elevated temperature and humidity conditions.
SCOPE
1.1 This test method covers the determination of the aging resistance of flexible low permeance vapor retarders for thermal insulation as classified in Specification C 1136. Water vapor permeance measurement and visual inspection after exposure at elevated temperature and humidity are used to assess vapor retarder response.
1.2 Typical vapor retarders applicable to this test method that are intended for indoor use include foil-scrim-kraft laminates, metallized polyester-scrim-kraft laminates, treated fabrics, treated papers, films, foils, or combinations of these materials that may comprise a vapor retarder material. This test method is not intended for assessment of the liquid-applied coatings, sealants, or mastics commonly used with insulation products.
1.3 The values stated in inch-pound units are to be regarded as standard. The SI units given in parentheses are for information purposes 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.
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Designation: C1258 − 08
StandardTest Method for
Elevated Temperature and Humidity Resistance of Vapor
1
Retarders for Insulation
This standard is issued under the fixed designation C1258; 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.
1. Scope 3. Terminology
1.1 This test method covers the determination of the aging 3.1 Terminology C168 shall be considered as applying to
resistance of flexible low permeance vapor retarders for the terms used in this specification.
thermal insulation as classified in Specification C1136. Water
4. Summary of Test Method
vapor permeance measurement and visual inspection after
exposure at elevated temperature and humidity are used to
4.1 The vapor retarders are subjected to accelerated aging
assess vapor retarder response.
via elevated temperature and humidity at 120°F (49°C) and
95 % relative humidity for a period of 28 days, then visually
1.2 Typical vapor retarders applicable to this test method
inspected for corrosion (if applicable), delamination, or other
that are intended for indoor use include foil-scrim-kraft
degradation. Water vapor permeance in accordance with Test
laminates, metallized polyester-scrim-kraft laminates, treated
Methods E96/E96M is measured after humid aging.
fabrics, treated papers, films, foils, or combinations of these
materials that may comprise a vapor retarder material.This test
5. Significance and Use
method is not intended for assessment of the liquid-applied
coatings, sealants, or mastics commonly used with insulation
5.1 On sub-ambient temperature systems, humid ambient
products. conditions cause a vapor driving force toward the insulation
which, if not retarded, is detrimental to the insulation’s thermal
1.3 The values stated in inch-pound units are to be regarded
resistance. Therefore a vapor retarder should resist degrada-
as standard. The SI units given in parentheses are for informa-
tion. Degradation in this test method is induced by elevated
tion purposes only.
temperature and humidity conditions.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 Environmental Chamber, capable of maintaining 120 6
priate safety and health practices and determine the applica-
2°F (49 6 1°C) and 95 6 2 % relative humidity, using distilled
bility of regulatory limitations prior to use.
or deionized water as the humidity source. The chamber shall
be of the air-circulating variety.
2. Referenced Documents
2
6.2 Lighted Box in a Darkened Room—A lighted box is an
2.1 ASTM Standards:
enclosure having five opaque sides with one transparent glass
C168 Terminology Relating to Thermal Insulation
or plastic viewing side. The box is illuminated using an
C1136 Specification for Flexible, Low Permeance Vapor
incandescent lightbulb. The viewing area shall be slightly
Retarders for Thermal Insulation
smaller than the vapor retarder specimen so that holes or
E96/E96M Test Methods for Water Vapor Transmission of
degradation caused by aging are readily visible.
Materials
6.3 Cotton Gloves.
6.4 Cardboard Overhead Transparency Frames or Equiva-
1
This test method is under the jurisdiction ofASTM Committee C16 on Thermal
lent.
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
6.5 Stainless Steel Staples.
Finishes and Moisture.
Current edition approved Aug. 1, 2008. Published August 2008. Originally
6.6 Glass or Stainless Steel Rods.
approvedin1994.Lastpreviouseditionapprovedin2000asC1258–94(2000).DOI:
10.1520/C1258-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Test Specimens
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 From each sample cut four specimens that are large
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. enough to acquire water vapor permeance test specimens after
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1258 − 08
exposure. The specimens shall be cut in a manner which best 9.1.1 For all products, place the specimens on the lighted
characterizes the roll width. Material exhibiting extraneous box and inspect for pinholes, large holes, or increased trans-
damage from mishandling in shipment or during sample lucency from the retained control specimen. Lightly mark
preparation shall be avoided. A fifth specimen shall be cut and noteworthy area
...
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:C1258–94(Reapproved 2000) Designation: C 1258 – 08
Standard Test Method for
Elevated Temperature and Humidity Resistance of Vapor
1
Retarders for Insulation
This standard is issued under the fixed designation C 1258; 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.
1. Scope
1.1 This test method covers the determination of the aging resistance of flexible low permeance vapor retarders for thermal
insulation as classified in Specification C 1136. Water vapor permeance measurement and visual inspection after exposure at
elevated temperature and humidity are used to assess vapor retarder response.
1.2 Typical vapor retarders applicable to this test method that are intended for indoor use include foil-scrim-kraft laminates,
metallized polyester-scrim-kraft laminates, treated fabrics, treated papers, films, foils, or combinations of these materials that may
comprise a vapor retarder material. This test method is not intended for assessment of the liquid-applied coatings, sealants, or
mastics commonly used with insulation products.
1.3 The values stated in inch-pound units are to be regarded as standard. The SI units given in parentheses are for information
purposes 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C 168 Terminology Relating to Thermal Insulation
C 1136 Specification for Flexible, Low Permeance Vapor Retarders for Thermal Insulation
E 96/E 96M Test Methods for Water Vapor Transmission of Materials
3. Terminology
3.1 Terminology C 168 shall be considered as applying to the terms used in this specification.
4. Summary of Test Method
3.1The4.1 The vapor retarders are subjected to accelerated aging via elevated temperature and humidity at 120°F (49°C) and
95 % relative humidity for a period of 28 days, then visually inspected for corrosion (if applicable), delamination, or other
degradation. Water vapor permeance in accordance with Test Methods E 96/E 96M is measured after humid aging.
4.Significance and Use
4.1On sub-ambient temperature systems, humid ambient conditions cause a vapor driving force toward the insulation which, if
not retarded, is detrimental to the insulation’s thermal resistance.Therefore a vapor retarder should resist degradation. Degradation
in this test method is induced by elevated temperature and humidity conditions.
5. Significance and Use
5.1 On sub-ambient temperature systems, humid ambient conditions cause a vapor driving force toward the insulation which,
if not retarded, is detrimental to the insulation’s thermal resistance. Therefore a vapor retarder should resist degradation.
Degradation in this test method is induced by elevated temperature and humidity conditions.
1
This test method is under the jurisdiction ofASTM Committee C16 onThermal Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation Finishes
and Moisture.
Current edition approved March 15, 1994. Published May 1994.
Current edition approved Aug. 1, 2008. Published August 2008. Originally approved in 1994. Last previous edition approved in 2000 as C 1258–94(2000).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
, Vol 04.06.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 ----------------------
C1258–08
6. Apparatus
5.1
6.1 Environmental Chamber, capable of maintaining 120 6 2°F (49 6 1°C) and 95 6 2 % relative humidity, using distilled or
deionized water as the humidity source. The chamber shall be of the air-circulating variety.
5.26.2 Lighted Box in a Darkened Room —A lighted box is an enclosure having five opaque sides with one transparent glass
or plastic viewing side. The box is illuminated using an incandescent lightbulb. The viewing area shall be slightly smaller than the
vapor retarder specimen so that holes or degradatio
...
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