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ASTM C1258-94(2000)

(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’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 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.

General Information

Status
Historical
Publication Date
31-Dec-1999
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 C1258-94 - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
Effective Date
01-Jan-2000
Replaced By
ASTM C1258-08 - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
Effective Date
01-Aug-2008
Referred By
ASTM C1423-21 - Standard Guide for Selecting Jacketing Materials for Thermal Insulation
Effective Date
01-Jan-2000
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-Jan-2000
Referred By
ASTM C1136-23 - Standard Specification for Flexible, Low Permeance Vapor Retarders for Thermal Insulation
Effective Date
01-Jan-2000
Referred By
ASTM C1224-22 - Standard Specification for Reflective Insulation for Building Applications
Effective Date
01-Jan-2000
Referred By
ASTM E2813-18 - Standard Practice for Building Enclosure Commissioning
Effective Date
01-Jan-2000

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ASTM C1258-94(2000) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for InsulationASTM C1258-94(2000) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
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ASTM C1258-94(2000) - 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:C1258–94(Reapproved 2000)
Standard Test Method for
Elevated Temperature and Humidity Resistance of Vapor
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 95 % relative humidity for a period of 28 days, then visually
inspected for corrosion (if applicable), delamination, or other
1.1 This test method covers the determination of the aging
degradation. Water vapor permeance in accordance with Test
resistance of flexible low permeance vapor retarders for
Methods E 96 is measured after humid aging.
thermal insulation as classified in Specification C 1136. Water
vapor permeance measurement and visual inspection after
4. Significance and Use
exposure at elevated temperature and humidity are used to
4.1 On sub-ambient temperature systems, humid ambient
assess vapor retarder response.
conditions cause a vapor driving force toward the insulation
1.2 Typical vapor retarders applicable to this test method
which, if not retarded, is detrimental to the insulation’s thermal
that are intended for indoor use include foil-scrim-kraft lami-
resistance. Therefore a vapor retarder should resist degrada-
nates, metallized polyester-scrim-kraft laminates, treated fab-
tion. Degradation in this test method is induced by elevated
rics, treated papers, films, foils, or combinations of these
temperature and humidity conditions.
materials that may comprise a vapor retarder material.This test
method is not intended for assessment of the liquid-applied
5. Apparatus
coatings, sealants, or mastics commonly used with insulation
5.1 Environmental Chamber, capable of maintaining 120 6
products.
2°F (49 6 1°C) and 95 6 2 % relative humidity, using distilled
1.3 The values stated in inch-pound units are to be regarded
or deionized water as the humidity source. The chamber shall
as standard. The SI units given in parentheses are for informa-
be of the air-circulating variety.
tion purposes only.
5.2 Lighted Box in a Darkened Room—A lighted box is an
1.4 This standard does not purport to address all of the
enclosure having five opaque sides with one transparent glass
safety concerns, if any, associated with its use. It is the
or plastic viewing side. The box is illuminated using an
responsibility of the user of this standard to establish appro-
incandescent lightbulb. The viewing area shall be slightly
priate safety and health practices and determine the applica-
smaller than the vapor retarder specimen so that holes or
bility of regulatory limitations prior to use.
degradation caused by aging are readily visible.
5.3 Cotton Gloves.
2. Referenced Documents
5.4 Cardboard Overhead Transparency Frames or Equiva-
2.1 ASTM Standards:
lent.
C 1136 Specification for Flexible, Low Permeance Vapor
2 5.5 Stainless Steel Staples.
Retarders for Thermal Insulation
5.6 Glass or Stainless Steel Rods.
E 96 Test Methods for Water Vapor Transmission of Mate-
rials
6. Test Specimens
6.1 From each sample cut four specimens that are large
3. Summary of Test Method
enough to acquire water vapor permeance test specimens after
3.1 The vapor retarders are subjected to accelerated aging
exposure. The specimens shall be cut in a manner which best
via elevated temperature and humidity at 120°F (49°C) and
characterizes the roll width. Material exhibiting extraneous
damage from mishandling in shipment or during sample
This test method is under the jurisdiction ofASTM Committee C16 onThermal
preparation shall be avoided.Afifth specimen shall be cut and
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
3 3
retained as a control. An 11 ⁄4 in. (298 mm) by 10 ⁄4 in. (273
Finishes and Moisture.
mm) specimen size is recommended since this is the size of a
Current edition approved March 15, 1994. Published May 1994.
Annual Book of ASTM Standards, Vol 04.06. typicaloverheadtransparencyframe,whichisusefultosupport
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C1258
specimens in the humidity chamber. In any case, the specimen 8.1.2 For foil
...

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

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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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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.  
5.2 Test Methods E96/E96M do not include instructions specific to preparing multiple-piece assemblies such as PSA joints. This practice provides those instructions.  
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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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