ASTM C991-15

Standard Specification for Flexible Fibrous Glass Insulation for Metal Buildings

ABSTRACT
This specification covers the classification, composition, and physical properties of flexible fibrous glass insulation for use as interior surface of walls and roofs of metal buildings. The basic insulation blanket is designed to be postprocessed by a laminating process that applies an adhesive bonded facing to provide the interior finish and vapor retarder requirements for the building envelope The flexible insulation is furnished into Types I and II. Type I which is a glass processed from the molten state into fibrous form, bonded with a thermosetting resin, and formed into a resilient flexible blanket or batt. Type II is a Type I material supplied with a suitable facing adhered to one surface. The following physical properties of Types I and II materials shall be determined: thermal resistance, surface burning characteristics, combustion characteristics, water vapor sorption, fungi resistance, corrosiveness, odor emission, dimensional tolerances, and humid aging.
SCOPE
1.1 This specification covers the classification, composition, and physical properties of flexible fibrous glass insulation for use in metal building roofs and walls.  
1.2 The basic insulation blanket is designed to be post-processed by a laminating process that applies an adhesive bonded facing.  
1.3 The thermal values measured in accordance with this specification for both pre-processed and post-processed insulation are for the insulation only and do not include the effects of air-film surface resistance, changes in mean temperature, or compression of insulation at the framing members of the building, through metal conductance of fasteners and other parallel heat-transfer paths due to design or installation techniques.  
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.  
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 and health practices and determine the applicability of regulatory requirements prior to use.

General Information

• Status: Historical
• Publication Date: 14-Apr-2015
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.23 - Blanket and Loose Fill Insulation

Relations

• Replaces: ASTM C991-08e1 - Standard Specification for Flexible Fibrous Glass Insulation for Metal Buildings
• Effective Date: 15-Apr-2015
• Referred By: ASTM E2988-17(2022) - Standard Practice for Specimen Preparation and Mounting of Flexible Fibrous Glass Insulation for Metal Buildings to Assess Surface Burning Characteristics
• Effective Date: 15-Apr-2015
• Referred By: ASTM C1558-19 - Standard Guide for Development of Standard Data Records for Computerization of Thermal Transmission Test Data for Thermal Insulation
• Effective Date: 15-Apr-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C991 −15
StandardSpecification for
1
Flexible Fibrous Glass Insulation for Metal Buildings
This standard is issued under the fixed designation C991; 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 Thisspecificationcoverstheclassification,composition,
C518 Test Method for Steady-State Thermal Transmission
and physical properties of flexible fibrous glass insulation for
Properties by Means of the Heat Flow Meter Apparatus
use in metal building roofs and walls.
C653 Guide for Determination of the Thermal Resistance of
1.2 The basic insulation blanket is designed to be post-
Low-Density Blanket-Type Mineral Fiber Insulation
processed by a laminating process that applies an adhesive
C665 Specification for Mineral-Fiber Blanket Thermal Insu-
bonded facing.
lation for Light Frame Construction and Manufactured
1.3 The thermal values measured in accordance with this Housing
C755 Practice for Selection of Water Vapor Retarders for
specification for both pre-processed and post-processed insu-
lation are for the insulation only and do not include the effects Thermal Insulation
C1104/C1104M Test Method for Determining the Water
of air-film surface resistance, changes in mean temperature, or
compression of insulation at the framing members of the Vapor Sorption of Unfaced Mineral Fiber Insulation
C1136 Specification for Flexible, Low Permeance Vapor
building, through metal conductance of fasteners and other
parallel heat-transfer paths due to design or installation tech- Retarders for Thermal Insulation
C1304 Test Method for Assessing the Odor Emission of
niques.
Thermal Insulation Materials
1.4 The values stated in inch-pound units are to be regarded
C1338 Test Method for Determining Fungi Resistance of
as standard. The values given in parentheses are mathematical
Insulation Materials and Facings
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
1.5 This standard does not purport to address all of the
E136 Test Method for Behavior of Materials in a Vertical
safety concerns, if any, associated with its use. It is the
Tube Furnace at 750°C
responsibility of the user of this standard to establish appro-
2.2 Other Referenced Document:
priate safety and health practices and determine the applica-
CAN/ULC-S102 Standard Method of Test for Surface Burn-
bility of regulatory requirements prior to use.
3
ing Characteristics of Building Materials andAssemblies
2. Referenced Documents
3. Terminology
2
2.1 ASTM Standards:
3.1 Definitions—For definitions of terms relating to
C167 Test Methods for Thickness and Density of Blanket or
insulation, refer to Terminology C168.
Batt Thermal Insulations
C168 Terminology Relating to Thermal Insulation
4. Classification
C177 Test Method for Steady-State Heat Flux Measure-
4.1 The flexible fibrous glass insulation is furnished in two
ments and Thermal Transmission Properties by Means of
types, as follows:
the Guarded-Hot-Plate Apparatus
4.1.1 Type I—Glass processed from the molten state into
fibrous form, bonded with a thermosetting resin, and formed
1
This specification is under the jurisdiction of ASTM Committee C16 on
into a blanket or batt.
Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on
4.1.2 Type II—Type I material supplied with a suitable
Blanket and Loose Fill Insulation.
facing adhered to one surface.
Current edition approved April 15, 2015. Published May 2015. Originally
ε1
approved in 1983. Last previous edition approved in 2008 as C991 – 08 . DOI:
NOTE 1—Facing properties are not part of this specification. The
10.1520/C0991-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Underwriters Laboratories (UL), 333 Pfingsten Rd.,
the ASTM website. Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C991−15
designer is referred to Practice C755 and Specification C1136 for
6.1.7 Odor Emission—When tested in accordance with Test
guidance in selecting water vapor permeance and other physical property
Method C1304, the insulation shall not emit a detectable odor
requirements.
objectionable to more than
...

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.
´1
Designation: C991 − 08 C991 − 15
Standard Specification for
1
Flexible Fibrous Glass Insulation for Metal Buildings
This standard is issued under the fixed designation C991; 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—6.1.2 was editorially updated in June 2008.
1. Scope
1.1 This specification covers the classification, composition, and physical properties of flexible fibrous glass insulation for use
in metal building roofs and walls.
1.2 The basic insulation blanket is designed to be post-processed by a laminating process that applies an adhesive bonded
facing.
1.3 The thermal values measured in accordance with this specification for both pre-processed and post-processed insulation are
for the insulation only and do not include the effects of air-film surface resistance, changes in mean temperature, or compression
of insulation at the framing members of the building, through metal conductance of fasteners and other parallel heat-transfer paths
due to design or installation techniques.
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.
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 and health practices and determine the applicability of regulatory
requirements prior to use.
2. Referenced Documents
2
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
C518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
C653 Guide for Determination of the Thermal Resistance of Low-Density Blanket-Type Mineral Fiber Insulation
C665 Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing
C755 Practice for Selection of Water Vapor Retarders for Thermal Insulation
C1104/C1104M Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
C1136 Specification for Flexible, Low Permeance Vapor Retarders for Thermal Insulation
C1258 Test Method for Elevated Temperature and Humidity Resistance of Vapor Retarders for Insulation
C1304 Test Method for Assessing the Odor Emission of Thermal Insulation Materials
C1338 Test Method for Determining Fungi Resistance of Insulation Materials and Facings
E84 Test Method for Surface Burning Characteristics of Building Materials
E136 Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C
2.2 Other Referenced Document:
3
CAN/ULC-S102 Standard Method of Test for Surface Burning Characteristics of Building Materials and Assemblies
1
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 May 1, 2008April 15, 2015. Published May 2008May 2015. Originally approved in 1983. Last previous edition approved in 20032008 as
ε1
C991 – 03.C991 – 08 . DOI: 10.1520/C0991-08E01.10.1520/C0991-15.
2
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.
3
Available from Underwriters Laboratories (UL), 333 Pfingsten Rd., Northbrook, IL 60062-2096, http://www.ul.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C991 − 15
3. Terminology
3.1 Definitions—For definitions of terms relating to insulation, refer to Terminology C168.
4. Classification
4.1 The flexible fibrous glass insulation is furnished in two types, as follows:
4.1.1 Type I—Glass processed from the molten state into fibrous form, bonded with a thermos
...