ASTM C1668-24
(Specification)Standard Specification for Externally Applied Reflective Insulation Systems on Rigid Duct in Heating, Ventilation, and Air Conditioning (HVAC) Systems
Standard Specification for Externally Applied Reflective Insulation Systems on Rigid Duct in Heating, Ventilation, and Air Conditioning (HVAC) Systems
ABSTRACT
This specification establishes the physical and performance requirements, and the corresponding test methods, for the evaluation of reflective insulation systems that are applied externally to rigid ducts in heating, ventilation, and air conditioning (HVAC) systems operating at specified temperatures. The products covered here are classified into five types according to the substrate material used, namely: Type A, product with polyethylene foam substrate; Type B, product with polyethylene bubble pack substrate; Type C, product with fiberglass substrate; Type D, product with polyester fiber substrate; and Type E, product with kraft paper substrate. Properly sampled specimens shall undergo test procedure to examine their conformance with the following requirements: emittance; water vapor permeance; surface burning characteristics; aging resistance; adhesive performance (bleeding and delamination); pliability; fungi resistance; thermal resistance; and hot-surface performance.
SCOPE
1.1 This specification covers the requirements and physical properties of reflective insulation systems applied externally to Rigid Heating, Ventilation, and Air Conditioning (HVAC) duct systems operating at or below 250°F (121.1°C). These insulation systems consist of one or more low-emittance surfaces, such as metallic foil or metallic deposits, mounted on substrates to produce reflective air spaces. Reflective insulation systems derive thermal performance from surfaces with an emittance of no greater than 0.1 facing enclosed air spaces.
1.2 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.
1.3 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.
1.4 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
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Standards Content (Sample)
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: C1668 − 24
Standard Specification for
Externally Applied Reflective Insulation Systems on Rigid
Duct in Heating, Ventilation, and Air Conditioning (HVAC)
1
Systems
This standard is issued under the fixed designation C1668; 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 C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots
1.1 This specification covers the requirements and physical
C411 Test Method for Hot-Surface Performance of High-
properties of reflective insulation systems applied externally to
Temperature Thermal Insulation
Rigid Heating, Ventilation, and Air Conditioning (HVAC) duct
C1045 Practice for Calculating Thermal Transmission Prop-
systems operating at or below 250°F (121.1°C). These insula-
erties Under Steady-State Conditions
tion systems consist of one or more low-emittance surfaces,
C1258 Test Method for Elevated Temperature and Humidity
such as metallic foil or metallic deposits, mounted on sub-
Resistance of Vapor Retarders for Insulation
strates to produce reflective air spaces. Reflective insulation
C1338 Test Method for Determining Fungi Resistance of
systems derive thermal performance from surfaces with an
Insulation Materials and Facings
emittance of no greater than 0.1 facing enclosed air spaces.
C1371 Test Method for Determination of Emittance of
1.2 The values stated in inch-pound units are to be regarded
Materials Near Room Temperature Using Portable Emis-
as standard. The values given in parentheses are mathematical
someters
conversions to SI units that are provided for information only
E84 Test Method for Surface Burning Characteristics of
and are not considered standard.
Building Materials
1.3 This standard does not purport to address all of the E96/E96M Test Methods for Gravimetric Determination of
safety concerns, if any, associated with its use. It is the
Water Vapor Transmission Rate of Materials
responsibility of the user of this standard to establish appro- E2599 Practice for Specimen Preparation and Mounting of
priate safety, health, and environmental practices and deter-
Reflective Insulation, Radiant Barrier and Vinyl Stretch
mine the applicability of regulatory limitations prior to use.
Ceiling Materials for Building Applications to Assess
1.4 This international standard was developed in accor- Surface Burning Characteristics
dance with internationally recognized principles on standard-
2.2 Other Test Method:
ization established in the Decision on Principles for the
TAPPI Standard T-512 sp-02 Creasing of Flexible Packaging
Development of International Standards, Guides and Recom-
3
Material Paper Specimens for Testing
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Terminology
2. Referenced Documents
3.1 Definitions:
2
3.1.1 Unless otherwise noted, the terms used in this speci-
2.1 ASTM Standards:
fication conform to Terminology C168.
C168 Terminology Relating to Thermal Insulation
C335 Test Method for Steady-State Heat Transfer Properties 3.2 Definitions of Terms Specific to This Standard:
of Pipe Insulation
3.2.1 HVAC ducts—as pertaining to this standard, ducts
having rigid rectangular or circular cross-section used to
transfer air from the air handling equipment to the conditioned
1
This specification is under the jurisdiction of ASTM Committee C16 on
space and return.
Thermal Insulation and is the direct responsibility of Subcommittee C16.21 on
Reflective Insulation.
3.2.2 insulation spacers—material used to form enclosed air
Current edition approved March 1, 2024. Published March 2024. Originally
spaces that are interior to the reflective insulation system.
approved in 2009. Last previous edition approved in 2020 as C1668 – 20. DOI:
10.1520/C1668-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Technical Association of the Pulp and Paper Industry (TAPPI),
the ASTM website. 15 Technology Parkway South, Norcross, GA 30092, http://www.tappi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1668 − 24
3.2.3 reflective insulation—thermal insulation consisting of 7.3 Surface Burning Characteristics—Surface B
...
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: C1668 − 20 C1668 − 24
Standard Specification for
Externally Applied Reflective Insulation Systems on Rigid
Duct in Heating, Ventilation, and Air Conditioning (HVAC)
1
Systems
This standard is issued under the fixed designation C1668; 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 specification covers the requirements and physical properties of reflective insulation systems applied externally to Rigid
Heating, Ventilation, and Air Conditioning (HVAC) duct systems operating at or below 250°F (121.1°C). These insulation systems
consist of one or more low-emittance surfaces, such as metallic foil or metallic deposits, mounted on substrates to produce
reflective air spaces. Reflective insulation systems derive thermal performance from surfaces with an emittance of no greater than
0.1 facing enclosed air spaces.
1.2 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.
1.3 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.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C168 Terminology Relating to Thermal Insulation
C335 Test Method for Steady-State Heat Transfer Properties of Pipe Insulation
C390 Practice for Sampling and Acceptance of Thermal Insulation Lots
C411 Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation
C1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
C1258 Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
C1338 Test Method for Determining Fungi Resistance of Insulation Materials and Facings
C1371 Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers
E84 Test Method for Surface Burning Characteristics of Building Materials
E96/E96M Test Methods for Gravimetric Determination of Water Vapor Transmission Rate of Materials
1
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.21 on Reflective
Insulation.
Current edition approved May 1, 2020March 1, 2024. Published June 2020March 2024. Originally approved in 2009. Last previous edition approved in 20192020 as
C1668 – 19.C1668 – 20. DOI: 10.1520/C1668-20.10.1520/C1668-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
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 ----------------------
C1668 − 24
E2599 Practice for Specimen Preparation and Mounting of Reflective Insulation, Radiant Barrier and Vinyl Stretch Ceiling
Materials for Building Applications to Assess Surface Burning Characteristics
2.2 Other Test Method:
3
TAPPI Standard T-512 sp-02 Creasing of Flexible Packaging Material Paper Specimens for Testing
3. Terminology
3.1 Definitions:
3.1.1 Unless otherwise noted, the terms used in this specification conform to Terminology C168.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 HVAC ducts—as pertaining to this standard, ducts having rigid rectangular or circular cross-section used to transfer air from
the air handling equipment to the conditioned space and return.
3.2.2 insulation spacers—material used to form enclosed air spaces that are interior to the reflective insulation system.
3.2.3 reflective insulation—thermal insulation consisting of one or more low emittance surfa
...
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