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ASTM C1258-08(2013)

(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
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.
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 C1136. 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 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.

General Information

Status
Historical
Publication Date
31-Aug-2013
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.33 - Insulation Finishes and Moisture
Current Stage
Ref Project

Relations

Replaces
ASTM C1258-08 - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
Effective Date
01-Sep-2013
Referred By
ASTM C1136-23 - Standard Specification for Flexible, Low Permeance Vapor Retarders for Thermal Insulation
Effective Date
01-Sep-2013
Referred By
ASTM E2813-18 - Standard Practice for Building Enclosure Commissioning
Effective Date
01-Sep-2013
Referred By
ASTM C1224-22 - Standard Specification for Reflective Insulation for Building Applications
Effective Date
01-Sep-2013
Referred By
ASTM C1668-20 - Standard Specification for Externally Applied Reflective Insulation Systems on Rigid Duct in Heating, Ventilation, and Air Conditioning (HVAC) Systems
Effective Date
01-Sep-2013
Referred By
ASTM C1423-21 - Standard Guide for Selecting Jacketing Materials for Thermal Insulation
Effective Date
01-Sep-2013

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ASTM C1258-08(2013) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for InsulationASTM C1258-08(2013) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
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ASTM C1258-08(2013) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
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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: C1258 − 08 (Reapproved 2013)
Standard Test Method for
Elevated Temperature and Humidity Resistance of Vapor
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 values given in parentheses are mathematical
tion. Degradation in this test method is induced by elevated
conversions to SI units that are provided for information only
temperature and humidity conditions.
and are not considered standard.
1.4 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
6.1 Environmental Chamber, capable of maintaining 120 6
responsibility of the user of this standard to establish appro-
2°F (49 6 1°C) and 95 6 2 % relative humidity, using distilled
priate safety and health practices and determine the applica-
or deionized water as the humidity source. The chamber shall
bility of regulatory limitations prior to use.
be of the air-circulating variety.
2. Referenced Documents
6.2 Lighted Box in a Darkened Room—A lighted box is an
enclosure having five opaque sides with one transparent glass
2.1 ASTM Standards:
or plastic viewing side. The box is illuminated using an
C168 Terminology Relating to Thermal Insulation
incandescent lightbulb. The viewing area shall be slightly
C1136 Specification for Flexible, Low Permeance Vapor
smaller than the vapor retarder specimen so that holes or
Retarders for Thermal Insulation
degradation caused by aging are readily visible.
E96/E96M Test Methods for Water Vapor Transmission of
Materials
6.3 Cotton Gloves.
6.4 Cardboard Overhead Transparency Frames or Equiva-
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 Sept. 1, 2013. Published January 2014. Originally
6.6 Glass or Stainless Steel Rods.
approved in 1994. Last previous edition approved in 2008 as C1258–08. DOI:
10.1520/C1258-08R13.
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
C1258 − 08 (2013)
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
...

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Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation

SIGNIFICANCE AND USE
5.1 On systems operating at sub-ambient temperature, humid ambient conditions cause a vapor driving force toward the insulation. If not retarded, the driven moisture vapor is detrimental to the insulation's thermal resistance. A vapor retarder must resist degradation in order maintain its resistance to vapor passage. Degradation in this test method is induced by elevated temperature and humidity conditions.
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1.1 This test method covers the determination of the resistance of flexible low permeance vapor retarders for thermal insulation as classified in Specification C1136 to elevated temperature and humidity. Water vapor permeance measurement and visual inspection after exposure at elevated temperature and humidity are used to assess vapor retarder response.  
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4.1 In many applications, the vapor retarders used on a thermal insulation will be exposed to the temperatures listed in 7.2. Cracking or delamination of the retarder under these conditions would, in most cases, cause it to lose its effectiveness as a vapor retarder material.
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1.1 This specification covers minimum material requirements, and safety precautions in application, for adhesives to bond thermal insulation duct liner on the interior surfaces of sheet metal air conditioning ducts; and for coating exposed edges and joints of duct liner thermal insulation to minimize erosion of insulation fibers by air movement.  
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ASTM C1809-20(Practice)
Standard Practice for Preparation of Specimens and Reporting of Results for Permeance Testing of Pressure Sensitive Adhesive Sealed Joints in Insulation Vapor Retarders

SIGNIFICANCE AND USE
5.1 PSA joints are a necessary and critical component of an insulation vapor retarder system and, in addition to knowing the permeance of the vapor retarder being used, assessing the permeance of the joints is necessary to indicate the expected performance of the system.  
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SCOPE
1.1 This practice provides instruction for the preparation of test specimens of pressure sensitive adhesive (PSA) sealed joints of the type employed in insulation vapor retarder systems, for subsequent testing per Test Methods E96/E96M to determine the water vapor permeance (“permeance”) of those joints. It does not cover preparation of other types of joints.  
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1.3 Joints are made with factory coated PSA tapes or PSA coated laminate jacket (vapor retarder cladding) materials.  
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