ASTM C991-98
(Specification)Standard Specification for Flexible Glass Fiber Insulation for Metal Buildings
Standard Specification for Flexible Glass Fiber Insulation for Metal Buildings
SCOPE
1.1 This specification covers the classification, composition, and physical properties of flexible glass fiber insulation for use as interior surface of walls and roofs of metal buildings.
1.2 The basic insulation blanket is designed to be post-processed by a laminating process that applies an adhesive bonded facing to provide the interior finish and vapor retarder requirements for the building envelope.
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 the standard. The values given in parentheses are provided for information only.
1.5 The following safety caveat pertains to the Test Method section of this specification: 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 limitations prior to use.
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Designation: C 991 – 98
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Flexible Glass Fiber Insulation for Metal Buildings
This standard is issued under the fixed designation C 991; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope The Heat Flow Meter Apparatus
C 653 Guide for Determination of the Thermal Resistance
1.1 This specification covers the classification, composition,
of Low-Density Blanket-Type Mineral Fiber Insulation
and physical properties of flexible glass fiber insulation for use
C 1104 Test Method for Determining Water Vapor Sorption
as interior surface of walls and roofs of metal buildings.
of Unfaced Mineral Fiber Insulation.
1.2 The basic insulation blanket is designed to be post-
C 1136 Specification for Flexible, Low Permeance Vapor
processed by a laminating process that applies an adhesive
Retarders for Thermal Insulation
bonded facing to provide the interior finish and vapor retarder
C 1338 Test Method for Determining Fungi Resistance of
requirements for the building envelope.
Insulation Materials and Facings
1.3 The thermal values measured in accordance with this
E 84 Test Method for Surface Burning Characteristics of
specification for both pre-processed and post-processed insu-
Building Materials
lation are for the insulation only and do not include the effects
E 96 Test Methods for Water Vapor Transmission of Mate-
of air-film surface resistance, changes in mean temperature, or
rials
compression of insulation at the framing members of the
building, through metal conductance of fasteners and other
3. Terminology
parallel heat-transfer paths due to design or installation tech-
3.1 Definitions—For definitions of terms relating to insula-
niques.
tion, refer to Terminology C 168.
1.4 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are provided
4. Classification
for information only.
4.1 The flexible insulation is furnished in two types, as
1.5 The following safety caveat pertains to the Test Method
follows:
section of this specification: This standard does not purport to
4.1.1 Type I—Glass processed from the molten state into
address all of the safety concerns, if any, associated with its
fibrous form, bonded with a thermosetting resin, and formed
use. It is the responsibility of the user of this standard to
into a resilient flexible blanket or batt.
establish appropriate safety and health practices and deter-
4.1.2 Type II—Type I material supplied with a suitable
mine the applicability of regulatory limitations prior to use.
vapor-retarder facing adhered to one surface.
2. Referenced Documents
5. Ordering Information
2.1 ASTM Standards:
5.1 Type I material shall be ordered by specifying thermal
C 167 Test Methods for Thickness and Density of Blanket
resistance value, length, and width.
or Batt Thermal Insulations
5.2 Type II material shall be ordered by specifying thermal
C 168 Terminology Relating to Thermal Insulating Materi-
resistance value, type of facing, facing permeance, length,
als
width, number of tabs, and tab width.
C 177 Test Method for Steady-State Heat Flux Measure-
5.3 Certification, when required, shall be in accordance with
ments and Thermal Transmission Properties by Means of
2 Section 12.
the Guarded-Hot-Plate Apparatus
C 390 Criteria for Sampling and Acceptance of Preformed
6. Physical Properties
Thermal Insulation Lots
6.1 Type 1 Material:
C 518 Test Method for Steady-State Heat Flux Measure-
6.1.1 Thermal Resistance—The thermal resistance of the
ments and Thermal Transmission Properties by Means of
pre-processed insulation from nine randomly selected speci-
mens, three specimens from each of three rolls, shall be not less
than 100% of the R-value agreed upon between the purchaser
This specification is under the jurisdiction of ASTM Committee C-16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on
and the supplier. Use Test Method C 177 or C 518 at 75°F
Blanket and Loose Fill Insulation.
Current edition approved Jan. 10, 1998. Published June 1998. Originally
published as C 991 – 83. Last previous edition C 991 – 92.
2 3
Annual Book of ASTM Standards, Vol 04.06. Annual Book of ASTM Standards, Vol 04.07.
C 991
specified by the designer when necessary.
(23.9°C) with a minimum temperature difference of 40°F
(20°C) for determining apparent thermal conductivity. Use Test
6.2.6 Facing Properties—Although other facing properties
Methods C 167 to determine the average thickness for each
are not part of this specification, properties required in Speci-
roll.
fication C 1136 may be pertinent to application or perfor-
mance.
NOTE 1—See Guide C 653. The thermal resistance is a function of
mean temperature. As an option, the thermal resistance may be determined
7. Workmanship
at additional mean temperatures as agreed upon by the purchaser and the
manufacturer.
7.1 Both Type I and Type II material shall indicate good
6.1.2 Surface Burning Characteristics—The surface burn- workmanship in fabrication and shall not have visible defects
which adversely affect its serviceability.
ing characteristics, determined in accordance with Test Method
E 84, shall be no greater than:
8. Sampling
Flame spread 25
Smoke developed 50
8.1 Quality control records, maintained by the manufac-
6.1.3 Water Vapor Sorption—The water vapor sorption
turer, will usually suffice in the relationship between the
from exposure to water vapor shall not be greater than 0.2 % by
purchaser and the manufacturer. If they mutually agree to
volume when determined in accordance with the procedure set
accept lots on the basis of quality control records, no further
forth in Test Method C 1104.
sampling is required.
6.1.4 Fungi Resistance— When tested in accordance with
8.2 If the above procedure is not acceptable, samp
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