ASTM C1482-24e1

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

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

Overview

ASTM C1482-24e1 is the internationally recognized standard specification for polyimide flexible cellular thermal and sound absorbing insulation. Developed by ASTM Committee C16, this standard defines the composition and physical properties of lightweight, flexible, open-cell polyimide foam designed for high-performance insulation in both commercial and industrial environments. The insulation covered by this standard is engineered for effective thermal and acoustic performance across a wide temperature range, from –328°F to +572°F (–200°C to +300°C).

Polyimide foam insulation is valued for its combination of low density, flexibility, high-temperature stability, and resistance to fire and chemicals, making it suitable for demanding applications. ASTM C1482-24e1 sets the requirements for several types of polyimide foam, including variants specifically designed for marine, industrial, and aerospace uses.

Key Topics

• Material Classification: Polyimide foams are classified by type and grade, each with unique properties regarding density, thermal conductivity, and application suitability.
• Physical Properties: The standard specifies rigorous physical and mechanical requirements, such as density, tensile strength, compressive strength, thermal conductivity, and thermal aging behavior.
• Thermal Insulation Performance: Specifies performance over temperatures from cryogenic to very high heat, making it suitable for extreme conditions.
• Sound Absorption: Includes requirements for acoustic absorption coefficients, indicating suitability for noise reduction in various environments.
• Fire Safety and Chemical Resistance: Mandates stringent testing for flame spread, smoke generation, toxic gas emissions, and chemical resistance.
• Workmanship and Quality Control: Sets standards for material appearance, defect repair, sampling, inspection, and acceptance criteria.
• Safety and Environmental Considerations: Addresses the need for appropriate vapor retarders, safe handling, and regulatory compliance for specific applications.

Applications

ASTM C1482-24e1 polyimide foam insulation is utilized across a variety of industries due to its high performance and adaptability:

• Industrial and Commercial Facilities: Used for insulating piping, HVAC systems, ductwork, and process equipment to control heat loss/gain and reduce noise transmission.
• Marine Environments: With specific annex requirements, faced polyimide foams are used for U.S. Navy ships to provide fire-resistant thermal and acoustic insulation on walls, ceilings, and pipes, ensuring both safety and comfort in demanding maritime applications.
• Aerospace Sector: Suitable for aircraft and spacecraft insulation, where lightweight, fire-resistant, and sound-absorbing materials are critical for performance and safety.
• Cryogenic and High-Temperature Systems: Performs across a broad temperature range, making it ideal for applications involving liquefied gases or high-temperature processing.
• Specialized Construction: Employed in specialized buildings or environments requiring efficient noise reduction and superior thermal management.

Related Standards

To ensure comprehensive product compliance and quality, ASTM C1482-24e1 references several other established standards and practices:

• ASTM C165 – Compressive Properties of Thermal Insulations
• ASTM C168 – Terminology Relating to Thermal Insulation
• ASTM C177, C518, C1114 – Steady-State Heat Flux and Thermal Transmission Properties
• ASTM C423 – Sound Absorption and Noise Reduction Coefficient Determination
• ASTM E84, ASTM E662 – Surface Burning Characteristics, Smoke Density
• FAA FAR 25.853, 25.856 – Flammability and Flame Propagation in Aerospace Applications
• Boeing BSS 7239 – Toxic Gas Generation Testing

Note: As of this edition, no ISO standard covers polyimide flexible cellular insulation, making ASTM C1482-24e1 the default international reference.

Practical Value

Organizations specifying polyimide flexible cellular insulation per ASTM C1482-24e1 benefit from:

• Assurance of material safety, performance, and quality for critical thermal and acoustic insulation applications
• Regulatory and procurement clarity when selecting or certifying materials for global projects
• Enhanced fire safety and environmental compliance
• Reliable performance data for engineering design, material selection, and installation planning

For maximum benefit, always consult manufacturers for application-specific recommendations and ensure complete compliance with both ASTM C1482-24e1 and any project-specific requirements.

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.
´1
Designation: C1482 − 24
Standard Specification for
Polyimide Flexible Cellular Thermal and Sound Absorbing
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.
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
2.1 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
This specification is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.22 on
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 [e-mail]. 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 Conshohocken, PA 19428-2959. United States
´1
C1482 − 24
Insulation for Nominal Sizes of Pipe and Tubing MIL-C-20079 Cloth, Glass; Tape, Textile Glass; and Thread,
C634 Terminology Relating to Building and Environmental Glass
MIL-A-3316 Adhesive, Fire-Resistant, Thermal Insulation
Acoustics
C665 Specification for Mineral-Fiber Blanket Thermal Insu- DOD-E-24607 Enamel, Interior, Nonflaming (Dry), Chlori-
nated Alkyd Resin, Semigloss (Metric)
lation for Light Frame Construction and Manufactured
Housing
2.3 Private Sector Standards:
C1045 Practice for Calculating Thermal Transmission Prop-
Boeing BSS 7239 Test Method for Toxic Gas Generation by
erties Under Steady-State Conditions
Materials on Combustion
C1058 Practice for Selecting Temperatures for Evaluating TAPPI T 803 Puncture and Stiffness Test of Container
and Reporting Thermal Properties of Thermal Insulation
Board
C1114 Test Method for Steady-State Thermal Transmission TM-232 Vertical Pipe-Chase Test to Determine Flame-
Properties by Means of the Thin-Heater Apparatus Propagation Characteristics of Pipe Covering
C1304 Test Method for Assessing the Odor Emission of
3. Terminology
Thermal Insulation Materials
C1338 Test Method for Determining Fungi Resistance of
3.1 Definitions—Terms used in this specification are defined
Insulation Materials and Facings
in Terminology C168, Terminology C634, and Terminology
C1559 Test Method for Determining Wicking of Fibrous
E176. In the case of a conflict, Terminology C168 shall be the
Glass Blanket Insulation (Aircraft Type)
dominant authority.
D395 Test Methods for Rubber Property—Compression Set
3.2 Definitions of Terms Specific to This Standard:
D543 Practices for Evaluating the Resistance of Plastics to
3.2.1 flexible cellular product—a cellular organic polymeric
Chemical Reagents
material that will not rupture when a specimen 8 by 1 by 1 in.
D638 Test Method for Tensile Properties of Plastics
(200 by 25 by 25 mm) is bent around a 1 in. (25 mm) diameter
D2126 Test Method for Response of Rigid Cellular Plastics
mandrel at a uniform rate of one lap in 5 s at a temperature
to Thermal and Humid Aging
between 64 and 85°F (18 and 29°C), in accordance with the
D3574 Test Methods for Flexible Cellular Materials—Slab,
description of a flexible cellular product (currently Subsection
Bonded, and Molded Urethane Foams
3.1.3) in Test Methods D3574.
D3675 Test Method for Surface Flammability of Flexible
3.2.2 slab—a rectangular section, piece, or sheet of foam
Cellular Materials Using a Radiant Heat Energy Source
that is cut from a bun, or block of foam.
E84 Test Method for Surface Burning Characteristics of
3.2.3 polyimide foam—a flexible cellular product in which
Building Materials
the bonds formed between monomers during polymerization
E96/E96M Test Methods for Gravimetric Determination of
are imide or amide bonds. The theoretical mole fraction of
Water Vapor Transmission Rate of Materials
imide bonds must be greater than the theoretical mole fraction
E176 Terminology of Fire Standards
of amide bonds.
E662 Test Method for Specific Optical Density of Smoke
Generated by Solid Materials
4. Classification
E795 Practices for Mounting Test Specimens During Sound
4.1 The flexible polyimide cellular insulations of this speci-
Absorption Tests
fication are classified into Types I through VII as listed in
E800 Guide for Measurement of Gases Present or Generated
Tables 1 and 2 (Note 2). Type I is further subdivided into two
During Fires
grades based on maximum allowable thermal conductivity at
E1354 Test Method for Heat and Visible Smoke Release
75°F (24°C). The Types II and III are subdivided into classes
Rates for Materials and Products Using an Oxygen Con-
(Note 3).
sumption Calorimeter
E2231 Practice for Specimen Preparation and Mounting of
NOTE 2—Although all types find application in a wide variety of
Pipe and Duct Insulation Materials to Assess Surface markets, the current primary market for each type is as follows:
Type I—marine and industrial applications.
Burning Characteristics
Type II—Type II is Type I foam faced and used in specific marine
2.2 U.S. Federal Standards:
applications, as specified for the U.S. Navy in Annex A1.
FAR 25.853(a), Appendix F, Part 1, (a) (1) (i) Test Criteria Type III—Type III is Type I foam pipe shaped and used in specific
marine applications, as specified for the U.S. Navy in Annex A1.
and Procedures for Showing Compliance with Sec.
3 Types IV, V, and VII—aerospace applications depending on density.
25.853, or 25.855
FAR 25.856(a), Appendix F, Part VI, Test Method to Deter-
mine the Flammability and Flame Propagation Character-
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
istics of Thermal/Acoustic Insulation Materials
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
www.dodssp.daps.mil.
Available from Boeing Commercial Airplane Group, Material Division, P.O.
Box 3707, Seattle, WA 98124-2207.
3 6
Federal Aviation Regulations Part 25 (Airworthiness Standards, Transport Available from Technical Association of the Pulp and Paper Industry (TAPPI),
Category Aircraft, and Section 25.853. Procedure in appendix F, Part I, (a) (1) (i) 15 Technology Parkway South, Norcross, GA 30092, http://www.tappi.org.
and (ii). Available from Superintendent of Documents, U.S. Government Printing Available from Armstrong World Industries, Inc., Research and Development,
Office P.O. Box 371954, Pittsburgh, PA 15250-7954. P.O. Box 3511, Lancaster, PA 17604.
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C1482 − 24
TABLE 1 Polyimide Foam Classification (inch-pound)
TYPE I TYPE I TYPE IV TYPE V TYPE VI TYPE VII
Grade 1 Grade 2
Density, range, lb/ft 0.36–0.53 0.36–0.53 0.28–0.37 0.50–0.58 0.35–0.55 0.42–0.52
Maximum Apparent Thermal Conductivity Btu-in./h ft –°F
–238°F 0.14 0.14 0.14 0.14 0.14 0.14
–58°F 0.23 0.22 0.23 0.23 0.23 0.23
75°F 0.32 0.29 0.34 0.30 0.34 0.34
212°F 0.51 0.47 0.54 0.47 0.50 0.50
356°F 0.74 0.70 0.81 0.70 0.74 0.74
A A A A A
572°F NA NA NA NA 1.15 NA
Upper Temperature Limit – test temperature for C411, °F 400 400 400 400 572 400
A A A A
High Temperature Stability – % of initial tensile strength retained after 336 h 60 60 NA NA NA NA
in air oven at 400° F, min, %
A A A A A
High Temperature Stability – % of initial tensile strength retained after 336 h NA NA NA NA 70 NA
in air oven at 572° F, min, %
2 A A A
Compressive Strength, min, lb/in. at 25% deflection 0.5 0.5 NA NA 0.5 NA
2 A A A A
50% Compression Deflection, min, lb/in 1.2 1.2 NA NA NA NA
A A A
Compression Set, max, % NA NA 45 40 NA 40
Steam Aging
A A A
Change in Tensile Strength, max, % 25 25 NA NA 25 NA
A A A
NA NA NA
Dimensional and weight changes, max, % 10 10 10
Corrosiveness pass pass pass pass pass pass
Chemical Resistance pass pass pass pass pass pass
Surface Burning Characteristics, 2 in. thickness
Flame Spread Index, max 10 10 15 15 10 15
Smoke Developed Index, max 15 15 20 20 15 20
A
Radiant Panel Surface Flammability, Radiant Panel Index, max 5 5 5 5 2 NA
B
Vertical Burn
A A A
Burn Length, max, in. NA NA 2 2.4 NA 2.4
A A A
After Flame Time, max, s NA NA 1 1 NA 1
2 A A A A
Total heat release (2 min), max, Btu/ft 79 79 NA NA NA NA
Flammability and Flame Propagation
A A A
After Flame Time, max., s NA NA 3.0 3.0 NA 3.0
A A A
NA NA NA
Flame Propagation, max., in. 2.0 2.0 2.0
2 A A A A
Maximum heat release rate, max, Btu/min-ft 106 106 NA NA NA NA
Specific Optical Smoke Density, D , max
m
non-flaming mode 5 5 5 5 5 5
flaming mode 10 10 10 10 5 10
A A A
Total Hydrogen Halide (HCl, HBr, and HF) Gases in Smoke, Flaming Exposure, 10 10 NA NA 10 NA
max, ppm (Above background for empty chamber)
Toxic Gas Generation: max, ppm
CO 300 300 300 300 300 300
HCN 5 5 5 5 5 5
HF 5 5 5 5 5 5
HCl 10 10 10 10 10 10
HBr 5 5 5 5 5 5
SO2 5 5 5 5 5 5
NOx 10 10 10 10 10 10
Acoustical Absorption Coefficient 2 in. thickness, min Noise Reduction 0.75 0.70 0.75 0.85 0.70 0.85
Coefficient (NRC)
Tumbling Friability
600 Revolutions, mass loss, Max % 3.0 3.0 3.0 3.0 3.0 3.0
1200 Revolutions, mass loss Max, % 5.0 5.0 5.0 5.0 5.0 5.0
Odor Emission Pass Pass Pass Pass Pass Pass
Fungi Resistance Pass Pass Pass Pass Pass Pass
Wicking, 48h, distance above water line, 0.5 0.5 0.5 0.5 0.5 0.5
max at 72°F, in.
A
NA = not applicable
B
The material shall not melt, drip, or flow when tested as required.
Type VI—applications requiring improved high temperature and fire
products made using different materials are equivalent with
performance.
respect to all physical properties.
NOTE 3—The Type II and Type III designations as well as the
subdivision of Types into Classes is to maintain uniformity with existing
6. Physical Properties
U.S. Navy nomenclature (Annex A1).
6.1 The insulation shall conform to the requirements in
5. Materials and Manufacture
Tables 1 and 2 for each type, unless specifically stated
5.1 Polyimide foam shall be manufactured from the appro- otherwise by agreement between the supplier and the pur-
priate monomers, and necessary compounding ingredients to chaser. Tests shall be made in accordance with the methods
conform to 3.2.3. This is not intended to imply that foam specified in Section 11.
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C1482 − 24
TABLE 2 Polyimide Foam Classification (SI units)
TYPE I TYPE I TYPE IV TYPE V TYPE VI TYPE VII
Grade 1 Grade 2
Density, range, kg/m 5.8–8.5 5.8–8.5 4.5–5.9 8.0–9.3 5.6–8.8 6.7–8.3
Maximum Apparent Thermal Conductivity W/m-K
–150°C 0.020 0.020 0.020 0.020 0.020 0.020
–50°C 0.033 0.032 0.033 0.033 0.033 0.033
24°C 0.046 0.042 0.049 0.043 0.049 0.049
100°C 0.074 0.068 0.078 0.068 0.072 0.072
180°C 0.107 0.101 0.117 0.101 0.107 0.107
A A A A A
300°C NA NA NA NA 0.166 NA
Upper Temperature Limit – test temperature for C411, °C 204 204 204 204 300 204
A A A A
High Temperature Stability – % of initial tensile strength retained after 336 h 60 60 NA NA NA NA
in air oven at 204°C, min, %
A A A A A
High Temperature Stability – % of initial tensile strength retained after 336 h NA NA NA NA 70 NA
in air oven at 300°C, min, %
A A A
Compressive Strength, min, kPa at 25 % deflection 3.4 3.4 NA NA 3.4 NA
A A A A
50% Compression Deflection, min, kPa 8 8 NA NA NA NA
A A A
Compression Set, max, % NA NA 45 40 NA 40
Steam Aging,
A A A
Change in Tensile Strength, max, % 25 25 NA NA 25 NA
A A A
NA NA NA
Dimensional and weight changes, max, % 10 10 10
Corrosiveness pass pass pass pass pass pass
Chemical Resistance pass pass pass pass pass pass
Surface Burning Characteristics, 50 mm thickness
Flame Spread Index, max 10 10 15 15 10 15
Smoke Developed Index, max 15 15 20 20 15 20
A
Radiant Panel Surface Flammability, Radiant Panel Index, max 5 5 5 5 2 NA
B
Vertical Burn ,
A A A
Burn Length, max, mm NA NA 50 60 NA 60
A A A
After Flame Time, max, s NA NA 1 1 NA 1
2 A A A A
Total heat release (2 min), max, kW-min/m 15 15 NA NA NA NA
Flammability and Flame Propagation
A A A
After Flame Time, max., s NA NA 3.0 3.0 NA 3.0
A A A
NA NA NA
Flame Propagation, max., in. 51 51 51
2 A A A A
Maximum heat release rate, max, kW/m 20 20 NA NA NA NA
Specific Optical Smoke Density, D , max
m
non-flaming mode 5 5 5 5 5 5
flaming mode 10 10 10 10 5 10
A A A
Total Hydrogen Halide (HCl, HBr, and HF) Gases in Smoke, Flaming Exposure, 10 10 NA NA 10 NA
max, ppm (Above background for empty chamber)
Toxic Gas Generation: max, ppm
CO 300 300 300 300 300 300
HCN 5 5 5 5 5 5
HF 5 5 5 5 5 5
HCl 10 10 10 10 10 10
HBr 5 5 5 5 5 5
SO2 5 5 5 5 5 5
NOx 10 10 10 10 10 10
Acoustical Absorption Coefficient 50.8 mm thickness, min Noise Reduction 0.75 0.70 0.75 0.85 0.70 0.85
Coefficient (NRC)
Tumbling Friability
A A
600 Revolutions, mass loss, Max % 3.0 3.0 NA NA 3.0 3.0
A A
1200 Revolutions, mass loss Max, % 5.0 5.0 NA NA 5.0 5.0
Odor Emission Pass Pass Pass Pass Pass Pass
Fungi Resistance Pass Pass Pass Pass Pass Pass
Wicking, 48 h, distance above water line, 13.0 13.0 13.0 13.0 13.0 13.0
max at 22°C, mm
A
NA = not applicable
B
The material shall not melt, drip, or flow when tested as required.
6.1.1 Upper Temperature Limit—Upper temperature limit 6.1.2 Burning Characteristics—The uncoated and unfaced
shall be determined according to 11.4 at the intended maximum foam shall conform to the requirements in Tables 1 and 2 for
use temperature of the application, or at a temperature deter- each type, when tested in accordance with 11.12-11.19, without
mined by agreement between the purchaser and manufacturer. the use of flame/smoke or heat suppressant barriers or coatings.
´1
C1482 − 24
6.1.3 Sound Absorbing Performance—Unless specifically 10. Inspection
otherwise agreed to between the supplier and the purchaser, all
10.1 The following requirements shall be employed for
tests shall be made in accordance with the methods specified in
acceptance sampling of lots or shipments of qualified polyim-
11.20.
ide foam insulation:
6.2 The values stated in Tables 1 and 2 are not to be used as
10.1.1 Density,
design values. It is the responsibility of the buyer to specify
10.1.2 Apparent Thermal Conductivity at 75°F (24°C),
design requirements and obtain supporting documentation
10.1.3 Vertical burn—Type IV and V only,
from the material supplier.
10.1.4 Workmanship, and
10.1.5 Tumbling Friability.
7. Workmanship and Appearance
10.2 As agreed to by the purchaser and the manufacturer,
7.1 The slab offered as saleable material shall be free of
the inspection of the material shall be made at either the point
foreign materials and defects that will adversely affect its
of shipment or point of delivery.
performance in service.
7.2 Voids and Surface Damage—It is acceptable to repair
11. Test Methods
surface damage due to handling, and voids that are between
11.1 Sample Preparation:
0.24 in. (6 mm) and 1.4 in. (35 mm) in diameter, and extend
11.1.1 In cases where the material is cut into pipe insulation
through the entire slab, by gluing, plugging, or cutting and
and other shapes without further treatment, slab foam test
splicing. Voids greater than 1.4 in. (35 mm) in diameter shall be
results are generally representative. If other processes are used
cause for rejection of the affected material. It is acceptable to
for specific applications, it is recommended that qualification
achieve plugging using compression fit or by using adhesives.
testing be conducted using slab specimens, and that inspection
Adhesives used for repair shall not affect the overall smoke,
testing be on the processed material.
fire, or acoustic performance required for the material in this
11.1.2 Tests for physical and mechanical properties shall be
specification. Material used for repairs shall be of the same
carried out at a temperature of 73.4 6 3.6°F (23 6 2°C) and at
composition and quality as undamaged material. The accep-
a relative humidity of 50 6 5 %. Sound absorbing, thermal,
tance of type and amount of repair shall be as agreed upon by
and flammability tests shall be carried out at conditions
the supplier and the user.
specified in the applicable test methods.
11.1.3 All test specimens for testing of physical and me-
8. Sampling
chanical properties in Tables 1 and 2 shall be preconditioned by
8.1 Sampling—The insulation shall be sampled in accor-
twice mechanically reducing (flexing) their thickness to a 25 %
dance with Practice C390. Otherwise, specific provisions for
deflection of their original thickness except for Test Methods
sampling shall be as agreed upon between the user and the
C421, C1559, and D3574, Test C, where unflexed foam shall
supplier.
be used. In cases where a specified test method itself contains
8.2 Specimen—For polyimide foam insulation, specimens
this requirement, additional flexing is not to be performed.
of dimensions 12 by 12 by 1 in. (300 by 300 by 25 mm) are
11.2 Density—Test Methods D3574, Test A.
sufficient for purposes of acceptance inspection of samples.
11.3 Apparent Thermal Conductivity—Test Methods C177,
9. Qualification Requirements C1114, and C518 in conjunction with Practice C1045. Test
Method C518 shall not be used at temperatures or resistances
9.1 The following requirements shall be employed for initial
other than those in the range of the calibration. Test tempera-
material or product qualification:
tures shall be chosen in accordance with Table 3 of Practice
9.1.1 Upper Temperature Limit (11.4),
C1058. Use the large temperature difference recommended in
9.1.2 Compressive Strength (11.6),
Table 3 of Practice C1058 for temperatures between 25 and
9.1.3 Compression Set (11.8),
110°F (–4 and 43°C); for mean temperatures under 25°F
9.1.4 Chemical Resistance (11.11),
(–4°C) and over 110°F (43°C) use the smaller temperature
9.1.5 Apparent Thermal Conductivity at 75°F (24°C) (11.3),
difference.
9.1.6 Specific Optical Smoke Density (11.17),
11.4 Upper Temperature Limit—Test Method C411 and
9.1.7 Hydrogen Halide Gases in Smoke (11.18),
Practice C447 shall be used at the maximum use temperature of
9.1.8 Surface Burning Characteristics (11.12),
the insulation and at maximum design thickness. No special
9.1.9 Radiant Panel Surface Flammability (11.13),
requirements for heat-up shall be specified by the manufac-
9.1.10 Flammability and Flame Propagation (11.15),
turer. The foam shall not flame, glow, smolder, smoke, soften,
9.1.11 Heat Release Rate (11.16),
collapse, melt, or drip during hot surface exposure.
9.1.12 Sound Absorption Coefficients (11.20),
9.1.13 Density (11.2),
11.5 High Temperature Stability—Test Method D2126 in-
9.1.14 Tumbling Friability (11.21),
corporating Test Method D638. Use Test Method D2126, with
9.1.15 Odor Emission (11.22),
a modified test temperature of 400°F (204°C) or 572°F (300°C)
9.1.16 Fungi Resistance (11.23), and
as shown in Tables 1 and 2. Test before and after aging using
9.1.17 Wicking (11.24). Test Method D638, type III specimens.
´1
C1482 − 24
11.6 Compressive Strength—Test Method C165, Procedure loss shall not be greater than 3 % after the first 600 6 3
B. revolutions (10 min.) and not greater than 5 % after the next
600 6 3 revolutions (10 min.; 20 min. total).
11.7 50 % Compression Deflection—Test Methods D3574,
Test C.
11.22 Odor Emission—Test Method C1304. A strong and
objectionable odor shall not be detected by more than two
11.8 Compression Set—Test Methods D395, test tempera-
judges.
ture is 158°F (70°C) and aging time is 22 h.
11.23 Fungi Resistance—Test Method C1338. The foam
11.9 Steam Aging—Test Methods D3574, Procedure J1 and
shall not exhibit greater growth than the comparative item.
Test E.
11.10 Corrosiveness—Test Method in Specification C665. 11.24 Wicking—Test Method C1559, Procedure A. Only the
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