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ASTM C1258-94

(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

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
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.33 - Insulation Finishes and Moisture
Current Stage
Ref Project

Relations

Replaced By
ASTM C1258-94(2000) - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
Effective Date
01-Jan-2000
Referred By
ASTM E2813-18 - Standard Practice for Building Enclosure Commissioning
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 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

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ASTM C1258-94 - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for InsulationASTM C1258-94 - Standard Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
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ASTM C1258-94 - 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 discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 1258 – 94
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 4. Significance and Use
1.1 This test method covers the determination of the aging 4.1 On sub-ambient temperature systems, humid ambient
resistance of flexible low permeance vapor retarders for conditions cause a vapor driving force toward the insulation
thermal insulation as classified in Specification C 1136. Water which, if not retarded, is detrimental to the insulation’s thermal
vapor permeance measurement and visual inspection after resistance. Therefore a vapor retarder should resist degrada-
exposure at elevated temperature and humidity are used to tion. Degradation in this test method is induced by elevated
assess vapor retarder response. temperature and humidity conditions.
1.2 Typical vapor retarders applicable to this test method
5. Apparatus
that are intended for indoor use include foil-scrim-kraft lami-
5.1 Environmental Chamber, capable of maintaining 120 6
nates, metallized polyester-scrim-kraft laminates, treated fab-
rics, treated papers, films, foils, or combinations of these 2°F (49 6 1°C) and 95 6 2 % relative humidity, using distilled
or deionized water as the humidity source. The chamber shall
materials that may comprise a vapor retarder material. This test
method is not intended for assessment of the liquid-applied be of the air-circulating variety.
5.2 Lighted Box in a Darkened Room—A lighted box is an
coatings, sealants, or mastics commonly used with insulation
products. enclosure having five opaque sides with one transparent glass
or plastic viewing side. The box is illuminated using an
1.3 The values stated in inch-pound units are to be regarded
as standard. The SI units given in parentheses are for informa- incandescent lightbulb. The viewing area shall be slightly
smaller than the vapor retarder specimen so that holes or
tion purposes only.
1.4 This standard does not purport to address all of the degradation caused by aging are readily visible.
5.3 Cotton Gloves.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.4 Cardboard Overhead Transparency Frames or Equiva-
lent.
priate safety and health practices and determine the applica-
5.5 Stainless Steel Staples.
bility of regulatory limitations prior to use.
5.6 Glass or Stainless Steel Rods.
2. Referenced Documents
6. Test Specimens
2.1 ASTM Standards:
C 1136 Specification for Flexible, Low Permeance Vapor 6.1 From each sample cut four specimens that are large
enough to acquire water vapor permeance test specimens after
Retarders for Thermal Insulation
E 96 Test Methods for Water Vapor Transmission of Mate- exposure. The specimens shall be cut in a manner which best
characterizes the roll width. Material exhibiting extraneous
rials
damage from mishandling in shipment or during sample
3. Summary of Test Method
preparation shall be avoided. A fifth specimen shall be cut and
3 3
3.1 The vapor retarders are subjected to accelerated aging retained as a control. An 11 ⁄4 in. (298 mm) by 10 ⁄4 in. (273
via elevated temperature and humidity at 120°F (49°C) and mm) specimen size is recommended since this is the size of a
95 % relative humidity for a period of 28 days, then visually typical overhead transparency frame, which is useful to support
inspected for corrosion (if applicable), delamination, or other specimens in the humidity chamber. In any case, the specimen
degradation. Water vapor permeance in accordance with Test size shall be at least 6 in. by 6 in. (152 mm by 152 mm).
Methods E 96 is measured after humid aging.
7. Aging Procedure
7.1 Use clean cotton gloves during handling to avoid
This test method is under the jurisdiction of ASTM Committee C-16 on
surface contamination that may be confused with corrosion on
Thermal Insulation and is the direct responsibility of Subcommittee C16.33 on
foil or metallized laminates.
Thermal Insulation Finishes and Vapor Transmission.
7.2 Once cut to the desired size, individually sandwich and
Current edition approved March 15, 1994. Pu
...

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SCOPE
1.1 This specification (see Note 1) covers grades of fuel oil intended for use in various types of fuel-oil-burning equipment under various climatic and operating conditions. These grades are described as follows:  
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