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ASTM C1918-21

(Test Method)

Standard Test Method for Water Retention of Rigid Thermal Insulation Materials after Immersion and Exposure to Drying Conditions

Standard Test Method for Water Retention of Rigid Thermal Insulation Materials after Immersion and Exposure to Drying Conditions

SIGNIFICANCE AND USE
5.1 This test method provides a means of measuring the water retention of flat specimens of rigid thermal insulation as a result of immersion in water and exposure to drying conditions.
SCOPE
1.1 This test method determines the amount of water retained (excluding surface water) by flat specimens of rigid thermal insulations after immersion and exposure to drying conditions. This test method is intended to be used for the characterization of materials in the laboratory. It is not intended to simulate any particular environmental condition potentially encountered in building construction applications.  
1.2 This test method does not address all the possible mechanisms of water intake and retention and related phenomena for rigid thermal insulations. It relates only to those conditions outlined in 1.1. Determination of moisture accumulation in thermal insulations due to partial immersion, water vapor transmission, internal condensation, freeze-thaw cycling, or a combination of these effects requires different test procedures.  
1.3 This test method does not address or attempt to quantify the drainage characteristics of materials.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems has the potential to result in non-conformance with the standard.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
30-Nov-2021
ICS
91.100.60 - Thermal and sound insulating materials
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.33 - Insulation Finishes and Moisture
Current Stage
Ref Project

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ASTM C1918-21 - Standard Test Method for Water Retention of Rigid Thermal Insulation Materials after Immersion and Exposure to Drying ConditionsASTM C1918-21 - Standard Test Method for Water Retention of Rigid Thermal Insulation Materials after Immersion and Exposure to Drying Conditions
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ASTM C1918-21 - Standard Test Method for Water Retention of Rigid Thermal Insulation Materials after Immersion and Exposure to Drying Conditions
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1918 − 21
Standard Test Method for
Water Retention of Rigid Thermal Insulation Materials after
1
Immersion and Exposure to Drying Conditions
This standard is issued under the fixed designation C1918; 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 2. Referenced Documents
2
1.1 This test method determines the amount of water re- 2.1 ASTM Standards:
tained (excluding surface water) by flat specimens of rigid C168 Terminology Relating to Thermal Insulation
thermal insulations after immersion and exposure to drying C303 Test Method for Dimensions and Density of Pre-
conditions. This test method is intended to be used for the formed Block and Board–Type Thermal Insulation
characterizationofmaterialsinthelaboratory.Itisnotintended C578 Specification for Rigid, Cellular Polystyrene Thermal
to simulate any particular environmental condition potentially Insulation
encountered in building construction applications.
3. Terminology
1.2 This test method does not address all the possible
3.1 Definitions—Terminology C168 applies to terms used in
mechanisms of water intake and retention and related phenom-
this test method.
ena for rigid thermal insulations. It relates only to those
conditions outlined in 1.1. Determination of moisture accumu-
4. Summary of Test Method
lation in thermal insulations due to partial immersion, water
vaportransmission,internalcondensation,freeze-thawcycling,
4.1 Test specimens are immersed in water for 24 h and
or a combination of these effects requires different test proce-
subsequently exposed to drying conditions for minimum of 24
dures.
h. Water absorption is determined after the immersion period
and water retention is determined after the exposure to drying
1.3 This test method does not address or attempt to quantify
period.
the drainage characteristics of materials.
1.4 The values stated in either SI units or inch-pound units
5. Significance and Use
are to be regarded separately as standard. The values stated in
5.1 This test method provides a means of measuring the
each system are not necessarily exact equivalents; therefore,
water retention of flat specimens of rigid thermal insulation as
each system shall be used independently of the other. Combin-
a result of immersion in water and exposure to drying
ing values from the two systems has the potential to result in
conditions.
non-conformance with the standard.
1.5 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 Temperature-Controlled Room or Chamber, suitable for
responsibility of the user of this standard to establish appro-
maintaining temperature within 62°C (64°F).
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
6.2 Temperature and Humidity-Controlled Room or
1.6 This international standard was developed in accor-
Chamber, suitable for maintaining temperature within 62°C
dance with internationally recognized principles on standard-
(64°F) and relative humidity within 65%.
ization established in the Decision on Principles for the
6.3 Caliper, Dial Gage, or Micrometer, suitable for measur-
Development of International Standards, Guides and Recom-
ing specimen dimensions to within 0.1 %.
mendations issued by the World Trade Organization Technical
6.4 Balance, suitable for measuring specimen weight to
Barriers to Trade (TBT) Committee.
within 0.1 %.
1
This test method is under the jurisdiction ofASTM Committee C16 on Thermal
2
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Finishes and Moisture. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Dec. 1, 2021. Published January 2022. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
C1918-21. the ASTM website.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1918 − 21
6.5 Immersion Pan—A pan of width and length of at least 10.5 Measure each specimen’s weight. This weight is the
400 mm (16 in.) and of a depth at least 50 mm (2 in.) greater intermediate weight, W .
2
than the specimen thickness.
10.6 Within 15 min after the removal fr
...

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1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
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1.4.1 The pipe insulation lineal thermal resistance and conductance,  
1.4.2 The pipe insulation lineal thermal transference,  
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This specification covers calcium silicate block and pipe thermal insulation for use on surfaces. Thermal insulation shall be of the following types: Type I; Type IA; and Type II. Calcium silicate thermal insulation shall consist principally of hydrous calcium silicate usually with the incorporation of fibrous reinforcement. The insulation shall conform to the physical requirements specified. Following test methods shall be performed: block insulation; pipe insulation; apparent thermal conductivity; linear shrinkage after heat soaking; flexural strength; compressive strength; mass loss by tumbling; hot surface performance; surface burning characteristics; stress corrosion performance; and moisture content by dry weight.
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5.3 For the purpose of product design, testing should be done at a variety of R-values. At least three R-values should be used: the lowest R-value on the product label, the highest R-value on the product label, and an R-value near the midpoint of the R-value range.
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5.4 Specimens are blown in a manner consistent with the intended installation procedure. Blowing machine settings should be representative of those typically used for field application with that machine.  
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SCOPE
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1.2 This test method is a laboratory procedure for use by manufacturers of loose-fill insulation for product design, label development, and quality control testing. The apparatus used produces installed thickness results at a given mass/unit area.  
1.3 This test method is not the same as the design density procedures described in Test Methods C520 or Specifications C739 or C764.  
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