ASTM C1071-19

Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)

ABSTRACT
This specification covers fibrous glass insulation used as a thermal and sound absorbing liner for interior surfaces of ducts, plenums, and other air handling equipment. The insulation shall be of the following types: Type I and Type II. The basic material shall be made from glass processed from the molten state into fibrous form with a binder added to form dimensionally stable insulation. The following test methods shall be performed: corrosiveness; water vapor sorption; fungi resistance; temperature resistance; erosion resistance; odor emission; surface burning characteristics; apparent thermal conductivity; sound absorption coefficients; bacteria resistance; and combustion characteristics.
SCOPE
1.1 This specification covers fibrous glass insulation used as a thermal and sound absorbing liner for interior surfaces of ducts, plenums, and other air handling equipment that handle air up to 250°F (121°C).  
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

• Status: Published
• Publication Date: 28-Feb-2019
• ICS: 91.120.10 - Thermal insulation of buildings
• ICS: 91.120.20 - Acoustics in building. Sound insulation
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.23 - Blanket and Loose Fill Insulation

Relations

• Replaces: ASTM C1071-16 - Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)
• Effective Date: 01-Mar-2019
• Refers: ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2024
• Refers: ASTM C390-08(2024) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Mar-2024
• Refers: ASTM E84-23d - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Dec-2023
• Refers: ASTM E84-23c - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Sep-2023
• Refers: ASTM C390-08(2019) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Sep-2019
• Refers: ASTM C1104/C1104M-19 - Standard Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
• Effective Date: 01-Sep-2019
• Refers: ASTM E84-19b - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Jul-2019
• Refers: ASTM C1617-19 - Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals
• Effective Date: 01-May-2019
• Refers: ASTM E84-19a - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 15-Apr-2019
• Refers: ASTM E84-19 - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Mar-2019
• Refers: ASTM C411-19 - Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation
• Effective Date: 01-Mar-2019
• Refers: ASTM C1114-06(2019) - Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus
• Effective Date: 01-Mar-2019
• Refers: ASTM E84-18b - Standard Test Method for Surface Burning Characteristics of Building Materials
• Effective Date: 01-Oct-2018
• Refers: ASTM C1617-18a - Standard Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from Thermal Insulation on Aqueous Corrosion of Metals
• Effective Date: 01-Sep-2018

Overview

ASTM C1071-19 is the internationally recognized standard specification for fibrous glass duct lining insulation, which serves as both a thermal and sound-absorbing material. Published by ASTM International, this standard outlines the requirements for fibrous glass insulation used in the interior surfaces of ducts, plenums, and other air-handling equipment that transports air at temperatures up to 250°F (121°C). The standard specifies two main types of insulation - Type I (blanket in roll form) and Type II (board in sheet form). It is widely referenced in the HVAC industry for establishing safety, performance, and quality criteria for duct liner materials.

Key Topics

• Material Scope: Covers fibrous glass insulation made from molten glass processed into fibers and stabilized with a binder, specifically excluding asbestos.
• Types of Insulation:
  • Type I: Blanket in roll form (length up to 200 ft, width 36-72 in, thickness 1½–3 in).
  • Type II: Board in sheet form (length up to 120 in, width up to 48 in, thickness 1½–3 in).
• Performance Requirements: The standard defines rigorous test methods and acceptance criteria for:
  • Corrosiveness
  • Water vapor sorption (≤3% by weight)
  • Fungi and bacteria resistance
  • Temperature resistance (exposure to up to 250°F)
  • Erosion resistance
  • Odor emission
  • Surface burning characteristics (maximum flame spread index of 25 and smoke developed index of 50)
  • Apparent thermal conductivity and sound absorption coefficients
  • Combustion characteristics
• Inspection and Sampling: Details criteria for dimensions, workmanship, packaging, marking, and testing methods to ensure consistent quality and performance.
• Safety and Compliance: Stresses the importance of safety and regulatory compliance, urging users to establish proper practices for handling and installation.

Applications

ASTM C1071-19 is essential in the HVAC industry, notably for:

• Thermal Insulation in Air Ducts: Improving energy efficiency by minimizing heat gain or loss in duct systems.
• Sound Absorption in Ductwork: Reducing noise levels due to airflow, equipment, and structural vibrations in ventilation systems.
• Air Handling Equipment: Suitable for lining plenums and other air-handling units where both thermal and acoustic performance are critical.
• Commercial and Institutional Buildings: Ensuring enhanced indoor environmental quality in office buildings, hospitals, schools, and industrial environments.
• HVAC Duct Construction: Supporting compliance with safety, health, and fire resistance codes in duct system installation and retrofitting.

This standard is widely adopted by building specifiers, contractors, engineers, and manufacturers of HVAC systems to guarantee reliable and safe insulation solutions.

Related Standards

ASTM C1071-19 references several important industry standards and test methods, including but not limited to:

• ASTM C167 – Thickness and density of thermal insulations
• ASTM C168 – Terminology relating to thermal insulation
• ASTM C423 – Sound absorption and coefficients
• ASTM E84 – Surface burning characteristics of building materials
• UL 181, UL 723 – UL tests for duct and surface burning characteristics
• NFPA 259 – Potential heat of building materials
• SMACNA HVAC Standards – Duct construction guidelines
• NAIMA Fibrous Glass Duct Liner Standard

These related standards and test methods ensure that fibrous glass duct liner insulation meets the highest benchmarks for performance, safety, and regulatory compliance in heating, ventilation, and air conditioning applications.

Keywords: ASTM C1071-19, fibrous glass insulation, duct liner, thermal insulation, sound absorbing, HVAC, ductwork, air handling, building materials, standard specification.

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: C1071 −19
Standard Specification for
Fibrous Glass Duct Lining Insulation (Thermal and Sound
Absorbing Material)
This standard is issued under the fixed designation C1071; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope C411 Test Method for Hot-Surface Performance of High-
Temperature Thermal Insulation
1.1 This specification covers fibrous glass insulation used as
C423 Test Method for SoundAbsorption and SoundAbsorp-
a thermal and sound absorbing liner for interior surfaces of
tion Coefficients by the Reverberation Room Method
ducts, plenums, and other air handling equipment that handle
C518 Test Method for Steady-State Thermal Transmission
air up to 250°F (121°C).
Properties by Means of the Heat Flow Meter Apparatus
1.2 The values stated in inch-pound units are to be regarded
C665 Specification for Mineral-Fiber Blanket Thermal Insu-
as standard. The values given in parentheses are mathematical
lation for Light Frame Construction and Manufactured
conversions to SI units that are provided for information only
Housing
and are not considered standard.
C1104/C1104M Test Method for Determining the Water
1.3 This standard does not purport to address all of the
Vapor Sorption of Unfaced Mineral Fiber Insulation
safety concerns, if any, associated with its use. It is the
C1114 Test Method for Steady-State Thermal Transmission
responsibility of the user of this standard to establish appro-
Properties by Means of the Thin-Heater Apparatus
priate safety, health, and environmental practices and deter-
C1304 Test Method for Assessing the Odor Emission of
mine the applicability of regulatory limitations prior to use.
Thermal Insulation Materials
1.4 This international standard was developed in accor-
C1338 Test Method for Determining Fungi Resistance of
dance with internationally recognized principles on standard-
Insulation Materials and Facings
ization established in the Decision on Principles for the
C1617 Practice for Quantitative Accelerated Laboratory
Development of International Standards, Guides and Recom-
Evaluation of Extraction Solutions Containing Ions
mendations issued by the World Trade Organization Technical
Leached from Thermal Insulation on Aqueous Corrosion
Barriers to Trade (TBT) Committee.
of Metals
E84 Test Method for Surface Burning Characteristics of
2. Referenced Documents
Building Materials
2.1 ASTM Standards:
E795 Practices for Mounting Test Specimens During Sound
C167 Test Methods for Thickness and Density of Blanket or
Absorption Tests
Batt Thermal Insulations
E2231 Practice for Specimen Preparation and Mounting of
C168 Terminology Relating to Thermal Insulation
Pipe and Duct Insulation Materials to Assess Surface
C177 Test Method for Steady-State Heat Flux Measure-
Burning Characteristics
ments and Thermal Transmission Properties by Means of
G21 Practice for Determining Resistance of Synthetic Poly-
the Guarded-Hot-Plate Apparatus
meric Materials to Fungi
C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots 2.2 Other Standards:
CAN/ULC-S102 Method of Test for Surface Burning Char-
acteristics of Building Materials and Assemblies
This specification is under the jurisdiction of ASTM Committee C16 on
NAIMA Fibrous Glass Duct Liner Standard
Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on
Blanket and Loose Fill Insulation.
Current edition approved March 1, 2019. Published March 2019. Originally
approved in 1986. Last previous edition approved in 2016 as C1071 – 16. DOI:
10.1520/C1071-19. Available from Underwriters Laboratories (UL), 2600 N.W. Lake Rd., Camas,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or WA 98607-8542, http://www.ul.com.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from North American Insulation Manufacturers Association
Standards volume information, refer to the standard’s Document Summary page on (NAIMA), 44 Canal Center Plaza, Suite 310, Alexandria, VA 22314, http://
the ASTM website. www.naima.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1071 − 19
NFPA 259 Test Method for Potential Heat of Building 7.2 Water Vapor Sorption—When tested in accordance with
Materials 12.4, the water vapor sorption of the insulation shall not be
SMACNA HVAC Duct Construction Standards more than 3 % by weight.
UL 181 Factory-Made Air Ducts and Air Connectors
7.3 Fungi Resistance—When tested in accordance with
UL723 Test for Surface Burning Characteristics of Building
12.5, the insulation shall be observed as having no fungal
Materials
growth.
3. Terminology
7.4 Temperature Resistance—When tested in accordance
with 12.6, the air stream surface shall have no evidence of
3.1 For definitions of terms used in this specification, see
flaming, glowing, smoldering, visible smoke, or delamination,
Terminology C168.
cracking, deformation or reduction in thickness.
4. Classification
7.5 Erosion Resistance—When tested in accordance with
4.1 The insulation covered by this specification shall be of
12.7, the insulation shall not break away, crack, peel, flake off,
the following types:
or show evidence of delamination or continued erosion when
4.1.1 Type I—Blanket in roll form up to 200 ft (61 m) in
air is passed through typical duct sections at a velocity
length, 36 to 72 in. (914 to 1829 mm) in width, and thicknesses
specified in 12.7.
1 1
of ⁄2 to 3 in. (13 to 76 mm), in ⁄2-in. (13-mm) increments.
7.6 Odor Emission—Whentestedinaccordancewith12.8,a
4.1.2 Type II—Boardinsheetform,upto120in.(3048mm)
detectable odor of objectionable nature recorded by more than
in length, up to 48 in. (1219 mm) in width, and thicknesses of
two of the five panel members shall constitute failure of the
1 1
⁄2 to 3 in. (13 to 76 mm) in ⁄2-in. (13-mm) increments.
material.
5. Ordering Information
7.7 Surface Burning Characteristics—Whentestedinaccor-
dance with 12.9, the air stream surface of the insulation shall
5.1 Purchasers shall select the preferred options permitted
have a maximum flame spread index of 25 and a maximum
herein and include the following information in procurement
smoke developed index of 50.
documents:
5.1.1 Title, designation, and year of this specification.
7.8 Apparent Thermal Conductivity—When tested in accor-
5.1.2 Type of insulation (see 4.1).
dance with 12.10, the apparent thermal conductivity (k) of the
5.1.3 Length, width, and thickness required (see 4.1). 2
insulation, expressed as Btu·in/h·ft ·°F (W/m·K) for the
5.1.4 Packaging required (see 16.1).
specified thickness shall not exceed the values shown in Table
5.1.5 Marking required (see 16.2 and 16.3).
1.
6. Materials and Manufacture 7.9 Sound Absorption Coeffıcients—When tested in accor-
dance with 12.11, the insulation shall have sound absorption
6.1 Basic Material—The basic material shall be made from
coefficients and noise reduction coefficients not less than
glass processed from the molten state into fibrous form with a
shown in Table 2.
binder added to form dimensionally stable insulation.Asbestos
shall not be used as an ingredient or component part of the
7.10 Combustion Characteristics—When tested in accor-
product.
dance with 12.12, the material shall have a potential heat value
not exceeding 3500 Btu/lb (8141 kJ/kg).
6.2 Air Stream Surface—Depending on the insulation sur-
face characteristics and service air velocity, the air stream
8. Dimensional Tolerances
surface is plain or coated with a temperature resistant coating
or faced with a plain or coated fibrous mat or fabric.
8.1 After conditioning for a minimum of 24 h at 706 3°F
(21 6 1.6°C) and 50 6 5 % relative humidity, the insulation
7. Physical Requirements
shall conform to the dimensional tolerances listed in Table 3.
7.1 Corrosiveness – Steel Only—When tested in accordance
with 12.3 per Specification C665, any corrosion resulting from
9. Workmanship, Finish, and Appearance
the unfaced insulation in contact with steel plates shall be
9.1 The insulation units shall indicate good workmanship in
judged to be no greater than the comparative plates in contact
fabrication and shall not have visible defects which adversely
with sterile cotton.
affect their service qualities.
7.1.1 Alternative Test – Steel Only—When tested in accor-
dance with 12.3.1 per Practice C1617, the mass loss corrosion
rate of the unfac
...

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: C1071 − 16 C1071 − 19
Standard Specification for
Fibrous Glass Duct Lining Insulation (Thermal and Sound
Absorbing Material)
This standard is issued under the fixed designation C1071; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification covers fibrous glass insulation used as a thermal and sound absorbing liner for interior surfaces of ducts,
plenums, and other air handling equipment that handle air up to 250°F (121°C).
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 safety, health, and healthenvironmental 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
2.1 ASTM Standards:
C167 Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the
Guarded-Hot-Plate Apparatus
C390 Practice for Sampling and Acceptance of Thermal Insulation Lots
C411 Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation
C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
C665 Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing
C1104/C1104M Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
C1114 Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus
C1304 Test Method for Assessing the Odor Emission of Thermal Insulation Materials
C1338 Test Method for Determining Fungi Resistance of Insulation Materials and Facings
C1617 Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from
Thermal Insulation on Aqueous Corrosion of Metals
E84 Test Method for Surface Burning Characteristics of Building Materials
E795 Practices for Mounting Test Specimens During Sound Absorption Tests
E2231 Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to Assess Surface Burning
Characteristics
G21 Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi
G22 Practice for Determining Resistance of Plastics to Bacteria (Withdrawn 2002)
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on Blanket and Loose
Fill Insulation.
Current edition approved Sept. 1, 2016March 1, 2019. Published September 2016March 2019. Originally approved in 1986. Last previous edition approved in 20122016
as C1071 – 12.C1071 – 16. DOI: 10.1520/C1071-16.10.1520/C1071-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
C1071 − 19
2.2 Other Standards:
CAN/ULC-S102 Method of Test for Surface Burning Characteristics of Building Materials and Assemblies
NAIMA Fibrous Glass Duct Liner Standard
NFPA 259 Test Method for Potential Heat of Building Materials
SMACNA HVAC Duct Construction Standards
UL 181 Factory-Made Air Ducts and Air Connectors
UL 723 Test for Surface Burning Characteristics of Building Materials
3. Terminology
3.1 For definitions of terms used in this specification, see Terminology C168.
4. Classification
4.1 The insulation covered by this specification shall be of the following types:
4.1.1 Type I—Blanket in roll form up to 200 ft (61 m) in length, 36 to 72 in. (914 to 1829 mm) in width, and thicknesses of
1 1
⁄2 to 3 in. (13 to 76 mm), in ⁄2-in. (13-mm) increments.
4.1.2 Type II—Board in sheet form, up to 120 in. (3048 mm) in length, up to 48 in. (1219 mm) in width, and thicknesses of
1 1
⁄2 to 3 in. (13 to 76 mm) in ⁄2-in. (13-mm) increments.
5. Ordering Information
5.1 Purchasers shall select the preferred options permitted herein and include the following information in procurement
documents:
5.1.1 Title, designation, and year of this specification.
5.1.2 Type of insulation (see 4.1).
5.1.3 Length, width, and thickness required (see 4.1).
5.1.4 Packaging required (see 16.1).
5.1.5 Marking required (see 16.2 and 16.3).
6. Materials and Manufacture
6.1 Basic Material—The basic material shall be made from glass processed from the molten state into fibrous form with a binder
added to form dimensionally stable insulation. Asbestos shall not be used as an ingredient or component part of the product.
6.2 Air Stream Surface—Depending on the insulation surface characteristics and service air velocity, the air stream surface is
plain or coated with a temperature resistant coating or faced with a plain or coated fibrous mat or fabric.
7. Physical Requirements
7.1 Corrosiveness – Steel Only—When tested in accordance with 12.3 per Specification C665, any corrosion resulting from the
unfaced insulation in contact with steel plates shall be judged to be no greater than the comparative plates in contact with sterile
cotton.
7.1.1 Alternative Test – Steel Only—When tested in accordance with 12.3.1 per Practice C1617, the mass loss corrosion rate of
the unfaced insulation extract shall not exceed that of the 5-ppm chloride solution.
7.2 Water Vapor Sorption—When tested in accordance with 12.4, the water vapor sorption of the insulation shall not be more
than 3 % by weight.
7.3 Fungi Resistance—When tested in accordance with 12.5, the insulation shall be observed as having no fungal growth.
7.4 Temperature Resistance—When tested in accordance with 12.6, the air stream surface shall have no evidence of flaming,
glowing, smoldering, visible smoke, or delamination, cracking, deformation or reduction in thickness.
7.5 Erosion Resistance—When tested in accordance with 12.7, the insulation shall not break away, crack, peel, flake off, or show
evidence of delamination or continued erosion when air is passed through typical duct sections at a velocity specified in 12.7.
7.6 Odor Emission—When tested in accordance with 12.8, a detectable odor of objectionable nature recorded by more than two
of the five panel members shall constitute failure of the material.
7.7 Surface Burning Characteristics—When tested in accordance with 12.9, the air stream surface of the insulation shall have
a maximum flame spread index of 25 and a maximum smoke developed index of 50.
Available from Underwriters Laboratories (UL), 2600 N.W. Lake Rd., Camas, WA 98607-8542, http://www.ul.com.
Available from North American Insulation Manufacturers Association (NAIMA), 44 Canal Center Plaza, Suite 310, Alexandria, VA 22314, http://www.naima.org.
Available from National Fire Protection Association (NFPA), 1 Batterymarch Park, Quincy, MA 02169-7471, http://www.nfpa.org.
Available from Sheet Metal and Air Conditioning Contractors’ National Association 4201 Lafayette Center Drive Chantilly, Virginia 20151-1219, http://www.smacna.org
C1071 − 19
7.8 Apparent Thermal Conductivity—When tested in accordance with 12.10, the apparent thermal conductivity (k) of the
insulation, expressed as Btu·in/h·ft ·°F (W/m·K) for the specified thickness shall not exceed the values shown in Table 1.
7.9 Sound Absorption Coeffıcients—When tested in accordance with 12.11, the insulation shall have sound absorption
coefficients and noise reduction coefficients not less than shown in Table 2.
7.10 Bacteria Resistance—When tested in accordance with 12.12, the insulation shall be observed as having no growth.
7.10 Combustion Characteristics—When tested in accordance with 12.1312.12, the material shal
...