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ASTM C1482-24e1

(Specification)

Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing Insulation

Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing Insulation

ABSTRACT
This specification covers the composition and physical properties of lightweight, flexible open-cell polyimide foam insulation intended for use as thermal and sound-absorbing insulation for a certain temperature range in commercial and industrial environments. The insulations are classified into the following types: Types I, II, III, IV, V, and VI. Polyimide foam shall be manufactured from the appropriate monomers, and necessary compounding ingredients. Different test methods shall be performed in order to determine the following properties of the insulation: density, apparent thermal conductivity, upper temperature limit, high temperature stability, compressive strength, compression deflection, compression set, steam aging, corrosiveness, chemical resistance, surface burning characteristics, radiant panel surface flammability, vertical burn, heat release rate, specific optical smoke density, hydrogen halides in smoke, toxic gas generation, and sound absorption coefficients.
SCOPE
1.1 This specification covers the composition and physical properties of lightweight, flexible open-cell polyimide foam insulation intended for use as thermal and sound-absorbing insulation for temperatures from –328°F up to +572°F (–200°C and +300°C) in commercial and industrial environments.  
1.1.1 Annex A1 includes faced polyimide foam as specified by the U.S. Navy for marine applications.  
1.1.2 This standard is designed as a material specification and not a design document. Physical property requirements vary by application and temperature. No single test is adequate for estimating either the minimum or maximum use temperature of polyimide foam under all possible conditions. Consult the manufacturer for specific recommendations and physical properties for specific applications.  
1.1.3 The use of an appropriate vapor retarder is required in all applications where condensation could occur and cause a decrease in thermal performance or affect other system properties.  
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 is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire-hazard or fire-risk assessment of the materials, products, or assemblies under actual fire conditions.
Note 1: The subject matter of this material specification is not covered by any other ASTM specification. There is no known ISO standard covering the subject of this 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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
29-Feb-2024
ICS
91.100.60 - Thermal and sound insulating materials
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.22 - Organic and Nonhomogeneous Inorganic Thermal Insulations
Current Stage
Ref Project

Relations

Replaces
ASTM C1482-24 - Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing Insulation
Effective Date
01-Mar-2024
Refers
ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
Effective Date
15-Apr-2024
Refers
ASTM C168-22 - Standard Terminology Relating to Thermal Insulation
Effective Date
01-May-2022
Referred By
ASTM C1594-23 - Standard Specification for Polyimide Rigid Cellular Thermal Insulation
Effective Date
01-Mar-2024
Referred By
ASTM C1558-24 - Standard Guide for Development of Standard Data Records for Computerization of Thermal Transmission Test Data for Thermal Insulation
Effective Date
01-Mar-2024

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ASTM C1482-24e1 - Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing InsulationASTM C1482-24e1 - Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing Insulation
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ASTM C1482-24e1 - Standard Specification for Polyimide Flexible Cellular Thermal and Sound Absorbing Insulation
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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.
´1
Designation: C1482 − 24
Standard Specification for
Polyimide Flexible Cellular Thermal and Sound Absorbing
1
Insulation
This standard is issued under the fixed designation C1482; 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
ε NOTE—Corrected 6.1 and 6.1.2 editorially in April 2024.
1. Scope responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1.1 This specification covers the composition and physical
mine the applicability of regulatory limitations prior to use.
properties of lightweight, flexible open-cell polyimide foam
1.5 This international standard was developed in accor-
insulation intended for use as thermal and sound-absorbing
dance with internationally recognized principles on standard-
insulation for temperatures from –328°F up to +572°F (–200°C
ization established in the Decision on Principles for the
and +300°C) in commercial and industrial environments.
Development of International Standards, Guides and Recom-
1.1.1 Annex A1 includes faced polyimide foam as specified
mendations issued by the World Trade Organization Technical
by the U.S. Navy for marine applications.
Barriers to Trade (TBT) Committee.
1.1.2 This standard is designed as a material specification
and not a design document. Physical property requirements
2. Referenced Documents
vary by application and temperature. No single test is adequate
2
2.1 ASTM Standards:
for estimating either the minimum or maximum use tempera-
C165 Test Method for Measuring Compressive Properties of
ture of polyimide foam under all possible conditions. Consult
Thermal Insulations
the manufacturer for specific recommendations and physical
C168 Terminology Relating to Thermal Insulation
properties for specific applications.
C177 Test Method for Steady-State Heat Flux Measure-
1.1.3 The use of an appropriate vapor retarder is required in
ments and Thermal Transmission Properties by Means of
all applications where condensation could occur and cause a
the Guarded-Hot-Plate Apparatus
decrease in thermal performance or affect other system prop-
C302 Test Method for Density and Dimensions of Pre-
erties.
formed Pipe-Covering-Type Thermal Insulation
1.2 The values stated in inch-pound units are to be regarded
C335 Test Method for Steady-State Heat Transfer Properties
as standard. The values given in parentheses are mathematical
of Pipe Insulation
conversions to SI units that are provided for information only
C390 Practice for Sampling and Acceptance of Thermal
and are not considered standard.
Insulation Lots
1.3 This standard is used to measure and describe the
C411 Test Method for Hot-Surface Performance of High-
response of materials, products, or assemblies to heat and flame
Temperature Thermal Insulation
under controlled conditions, but does not by itself incorporate
C421 Test Method for Tumbling Friability of Preformed
all factors required for fire-hazard or fire-risk assessment of the
Block-Type and Preformed Pipe-Covering-Type Thermal
materials, products, or assemblies under actual fire conditions.
Insulation
C423 Test Method for Sound Absorption and Sound Absorp-
NOTE 1—The subject matter of this material specification is not covered
tion Coefficients by the Reverberation Room Method
by any other ASTM specification. There is no known ISO standard
covering the subject of this standard. C447 Practice for Estimating the Maximum Use Tempera-
ture of Thermal Insulations
1.4 This standard does not purport to address all of the
C518 Test Method for Steady-State Thermal Transmission
safety concerns, if any, associated with its use. It is the
Properties by Means of the Heat Flow Meter Apparatus
C585 Practice for Inner and Outer Diameters of Thermal
1
This specification is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on
2
Organic and Nonhomogeneous Inorganic Thermal Insulations. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2024. Published April 2024. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2000. Last previous edition approved in 2023 as C1482 – 23. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1482-24E01. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consh
...

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1.1 This specification covers the composition and physical requirements of chemically treated, recycled cellulosic fiber loose-fill type thermal insulation for use in attics or enclosed spaces in housing, and other framed buildings within the ambient temperature range from −45 to 90°C by pneumatic or pouring application. While products that comply with this specification are used in various constructions, they are adaptable primarily, but not exclusively, to wood joist, rafters, and stud construction.  
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SIGNIFICANCE AND USE
5.1 Coverage charts list the required installed and product in-service parameters of minimum thickness, maximum net coverage per package, and minimum mass per unit area to achieve each listed thermal performance (R-value) level. Chart information corresponds to numerous standard R-value levels representing common building codes, industry standards, or legislated requirements (see example in the Appendix X1) and therefore additional chart columns may be required, that is, number of packages per 1 000 ft2 (100m2), and initial installed thickness.  
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SCOPE
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1.2 This guide applies to a wide variety of loose-fill thermal insulation products including mineral fiber (Specification C764), or cellulosic fiber (Specification C739) materials; granular types including vermiculite (Specification C516) and perlite (Specification C549); pelletized products; and any other insulation materials that are installed pneumatically or poured in place.  
1.3 Coverage charts for loose-fill insulation products are required by regulation under the United States Federal Trade Commission’s 16 CFR Part 460. Other countries or local governing agencies may have coverage chart requirements in addition to, or that differ from, those presented in this guide; see the Appendix for examples.  
1.4 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.  
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ASTM C870-24(Practice)
Standard Practice for Conditioning of Thermal Insulating Materials

SIGNIFICANCE AND USE
5.1 The conditioning prescribed in this recommended practice is designed to obtain reproducible test results on thermal insulating materials. Results of tests obtained on these materials under uncontrolled atmospheric conditions are not comparable with each other. Some of the physical properties of thermal insulating materials are influenced by relative humidity and temperature in a manner that affects the results of tests. In this regard, such information is provided in pertinent material specifications and test methods by stating the physical properties relative to the specific ambient or test conditions.
Note 1: In some cases (for example, dimensionally unstable materials), the dry mass cannot easily be established and original mass has to be used.
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1.1 This practice covers the conditioning of thermal insulating materials for tests. Since prior exposure of insulating materials to high or low humidity will affect the equilibrium moisture content, a procedure is also given for preconditioning the materials.  
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Standard Practice for Sampling and Acceptance of Thermal Insulation Lots

SIGNIFICANCE AND USE
4.1 The sampling and inspection prescribed in this practice afford the purchaser a practical level of quality assurance on incoming material. They are based on cost/risk relationships considered typical for preformed thermal insulations offered for general use. In all cases, the purchaser should review this practice and determine its suitability in terms of his specific needs.  
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1.1.1 Additional requirements for Types IV and XIII for pipe, tank, and equipment thermal insulation for temperatures from –320 to +165°F (–196 to +73.9°C) are contained in Annex A1.  
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1.1 This specification covers the composition, physical properties, and product forms of microporous thermal insulation for use on surfaces at temperatures from 80°C [176°F] up to 1150°C [2102°F], unless otherwise agreed upon by the manufacturer and purchaser.  
1.2 This specification only covers microporous thermal insulation comprising compacted powder, fibers and opacifiers.  
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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ASTM C692-13(2023)(Test Method)
Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel

SIGNIFICANCE AND USE
5.1 An inherent characteristic of some alloys of austenitic stainless steel is their tendency to crack at stress points when exposed to certain corrosive environments. The mechanisms of ESCC are complex and not completely understood but are apparently related to certain metallurgical properties. Chloride and fluoride ions have the potential to induce stress corrosion cracking in the absence of inhibiting ions.3  
5.2 Chlorides are common to many environments, so great care shall be taken to protect austenitic stainless steel from chloride contamination.  
5.3 Most thermal insulations will not, of themselves, cause stress corrosion cracking. Preproduction qualification tests are used to evaluate that under the conditions of the laboratory test that specific thermal insulation materials do not cause cracking of sensitized austenitic stainless steel. Insulation systems have the potential to act as collecting media by means of transmigration and concentration of corrosive ions on heated stainless steel surfaces. Exposure to elevated temperature results in evaporation of water and increased chemical reaction rates. Environments containing corrosive ions, moisture, and oxygen will increase the chance for stress corrosion cracking.  
5.4 Insulation materials are available that are specially formulated to inhibit stress corrosion cracking in the presence of chlorides through modifications in basic composition or incorporation of certain chemical additives.  
5.5 The ability of the 28-day test to measure the corrosion potential of insulation materials is documented by Karnes,4 whose data appear to have been used for construction of the acceptability curve used in Specification C795 and other specifications.  
5.6 The metal for all of the coupons used in this test method (C692) shall be qualified (see Section 14) to ascertain that under conditions of the test, chloride ions will cause the metal to crack, and deionized water alone will not cause cracks.
SCOPE
1.1 This test method covers two procedures for the laboratory evaluation of thermal insulation materials to determine whether they contribute to external stress corrosion cracking (ESCC) of austenitic stainless steel due to soluble chlorides within the insulation. This laboratory procedure is not intended to cover all of the possible field conditions that contribute to ESCC.  
1.2 While the 1977 edition of this test method (Dana test) is applicable only to wicking-type insulations, the procedures in this edition are intended to be applicable to all insulating materials, including cements, some of which disintegrate when tested in accordance with the 1977 edition. Wicking insulations are materials that wet through and through when partially (50 % to 75 %) immersed in water for a short period of time (10 min or less).  
1.3 These procedures are intended primarily as a preproduction test for qualification of the basic chemical composition of a particular manufacturer's product and are not intended to be routine tests for ongoing quality assurance or production lot compliance. Test Methods C871, on the other hand, is used for confirmation of acceptable chemical properties of subsequent lots of insulation previously found acceptable by this test method.  
1.4 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.  
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