ASTM C728 - 17a (2022)

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Designation: C728 −17a (Reapproved 2022)
Standard Speciﬁcation for
Perlite Thermal Insulation Board
1
This standard is issued under the ﬁxed designation C728; 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 the composition and physical
properties for perlite thermal insulation board used principally
above structural roof decks and as a base for built-up, modiﬁed,
and elastomeric membrane rooﬁng in building construction.
1.2 When adopted by an authority having jurisdiction, codes
that address ﬁre properties in many applications regulate the
use of the thermal insulation materials covered by this speci-
ﬁcation. Fire properties are controlled by job, project, or other
speciﬁcations where codes or government regulations do not
apply.
1.3 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.
1.4 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 appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 The following standards, of the issue in effect on the
date of material purchase, form a part of this speciﬁcation to
the extent speciﬁed herein:
2.2 ASTM Standards:
2
C165 Test Method for Measuring Compressive Properties of
Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measure-
ments and Thermal Transmission Properties by Means of
the Guarded-Hot-Plate Apparatus
C203 Test Methods for Breaking Load and Flexural Proper-
ties of Block-Type Thermal Insulation
C209 Test Methods for Cellulosic Fiber Insulating Board
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
C1289 Speciﬁcation for Faced Rigid Cellular Polyisocyanu-
rate Thermal Insulation Board
E84 Test Method for Surface Burning Characteristics of
Building Materials
C1763 Test Method for Water Absorption by Immersion of
Thermal Insulation Materials
3. Terminology
3.1 For complete descriptions of terms used in this
speciﬁcation, refer to Terminology C168.
4. Classiﬁcation
4.1 Perlite thermal insulation board is classiﬁed as follows:
4.1.1 Type 1, Roof Insulation Board—A perlite based roof
insulation cover board.
4.1.2 Type 2, Roof Cover or Recover Board—This is used
primarily as a ﬁeld-applied cover board over other roof
insulations or in rerooﬁng applications. The product is also
available to manufacturers of laminated rigid foam products as
speciﬁed in Speciﬁcation C1289, Type III.
4.1.3 Type 3, Roof Cover or Recover Board—A perlite based
cover board that is ﬁeld applied over other roof insulations or
in re-rooﬁng and recover applications. The product is also
1
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.
Current edition approved March 1, 2022. Published April 2022. Originally
approved in 1972. Last previous edition approved in 2017 as C728 – 17a. DOI:
10.1520/C0728-17AR22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. 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
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

available to manufacturers of laminated rigid foam products as
speciﬁed in Speciﬁcation C1289, Type III.
5. Ordering Information
5.1 Orders shall at least include the following information:
5.1.1 Title and designation Speciﬁcation C728.
5.1.2 Product name, nominal thickness and dimensions.
5.1.3 Quantity of material ordered.
5.1.4 Manufacturer’s name, address, and telephone number.
6. Materials and Manufacture
6.1 Composition—The basic material of the insulation board
shall be perlite expanded by the application of heat to form
glassy, cellular aggregates. The insulation and cover board
shall be composed of expanded perlite and ﬁbers formed into
rigid, ﬂat, rectangular units with a suitable sizing material
incorporated in the product. A facing or coating is potentially
present on one or both surfaces to prevent excessive hot
bitumen strike-in or adhesive absorption during rooﬁng instal-
lation.
6.2 Lamination—The ﬁnished board is either single-ply or
multiple-ply. When multiple-ply boards are supplied, a suitable
adhesive shall be used to join the plies.
7. Physical Properties
7.1 Thermal Resistance—Perlite thermal insulation boards
and cover shall conform to the following thermal resistances:
Nominal Thickness
in. (mm)
Thermal Resistance,
F·h·ft
2
/btu (Km
2
/W)
Type 1 Type 2 Type 3
1
⁄
2
(13) 1.4 (0.25) 1.3 (0.23) 1.2 (0.22)
3
⁄
4
(19) 2.0 (0.35) ... ...
1 (25) 2.7 (0.48) ... ...
1
1
⁄
2
(38) 4.1 (0.72) ... ...
2 (51) 5.4 (0.95) ... ...
2
1
⁄
2
(64) 6.5 (1.1) ... ...
3 (76) 8.1 (1.4) ... ...
7.1.1 Nominal thickness is the thickness of insulation re-
quired to obtain the desired resistance value. It is possible that
the nominal thickness will fall outside the thicknesses shown in
7.1. See 8.1 for tolerances.
7.1.2 It is acceptable for insulation and cover boards having
thermal resistances other than those values listed to be supplied
as agreed upon by purchaser and seller.
7.2 The insulation and cover board shall further conform to
the physical requirements shown in Table 1.
8. Standard Dimensions and Tolerances
8.1 The dimensions and tolerances shall conform to those
listed below. it is acceptable for other dimensions to be
supplied as agreed upon by purchaser and seller.
Dimensions, in. (mm) Tolerance, in. (mm)
Length, 36 (915), 48 (1220) 72 (1830), 96 (2440) +
1
⁄
4
(6)
−
1
⁄
8
(3)
Width, 24 (610), 48 (1220) +
1
⁄
4
(6)
−
1
⁄
8
(3)
Thickness,
1
⁄
2
to 3, (13 to 76), incl ±
1
⁄
16
(1.6)
8.1.1 Board squareness shall be within required tolerance if
the two diagonal measurements of the board differ by no more
than
1
⁄
4
in. (6 mm).
8.2 The fabrication of tapered perlite roof insulation board
products shall be acceptable if dimension and installation
speciﬁcations are agreed upon between buyer and seller.
9. Workmanship, Finish, and Appearance
9.1 The surface of the board shall be clean, dry, and free of
visual defects that will adversely affect the service quality.
Edges shall be square.
10. Sampling
10.1 Unless otherwise speciﬁed, sampling for qualiﬁcation
and inspection tests, if required, shall be in accordance with
Practice C390.
11. Test Methods
11.1 Thermal Resistance—Test Method C177 or C518 at a
mean temperature of 75 62°F (24 61°C) and a minimum
temperature difference of 40°F (22°C). In the event of
challenge, Test Method C177 shall be the referee method.
11.2 Compressive Strength—Test Method C165, Procedure
A, at a crosshead speed of 0.05 in./min (1.3 mm/min) for all
thicknesses using specimen dimensions of 2 in. (51 mm) length
by 2 in. (51 mm) width.
11.3 Tensile Strength Perpendicular to the Surface—Section
12 on Tensile Strength Perpendicular to Surface of Test
Methods C209 using specimen dimensions of 2 in. (51 mm)
length by 2 in. (51 mm) width.
TABLE 1 Physical Requirements
Property Units Type 1 Type 2 Type 3
Density lb/ft
3
(kg/m
3
) 8 (128) min 10 (160) min 12 (192) min
Compressive strength at
10 % deformation
psi (kPa) 30 (207) min 45 (310) min 60 (414) min
Tensile strength,
perpendicular
lbf/ft
2
(kPa) 575 (27.5) min 800 (38.3) min 1800 (86) min
Break Load Strength lbf (kgf) 6.5 (2.9) min 4.5 (2.0) min 8 (3.6) min
Flexural strength
A
psi (kPa)
< 1 in. 50 (345) min 35 (241) min 65 (448) min
$1 in. 10 (69) min 5 (34) min 15 (103) min
Water absorption volume % 1.5 max 3.5 max 3.5 max
A
Minimum ﬂexural strength requirement is based on the calculated value from the minimum required break load strength and the maximum current available thicknesses
including the thickness tolerance in 8.1. Reference Test Methods C203 for appropriate calculations.
C728 − 17a (2022)
2

11.4 Flexural Strength and Break Load—Test Methods

C203, Method I, Procedure D, except test at a strain rate of 2

in./min using 3 in. (76 mm) wide specimens on a 10 in. (254

mm) span.

11.5 Flame Spread Classiﬁcation—Test Method E84 in the

event that surface burning characteristics are required.

11.6 Water Absorption—Test Methods C1763, Procedure B.

11.7 Thickness—Thickness section of Test Methods C209.

11.8 Oven-Dry Density—Moisture Content and Density sec-

tion of Test Methods C209.

12. Qualiﬁcation and Inspection

12.1 Qualiﬁcation tests shall be run on the physical require-

ments given in 7.1 and 7.2.

12.2 Inspection requirements are given in 8.1.

13. Rejection

13.1 Failure to conform to any of the requirements of this

speciﬁcation shall constitute grounds for rejection. In case of

rejection, the seller shall have the right to reinspect the rejected

shipment and resubmit the lot after removal of that portion not

conforming to the speciﬁed requirements.

14. Packaging and Package Marking

14.1 Packaging—Unless otherwise speciﬁed, boards shall

be packaged in the manufacturer’s standard commercial con-

tainers. Special packaging shall be provided when agreed to in

writing between purchaser and seller.

14.2 Marking—Unless otherwise speciﬁed, each container

shall be plainly marked with the supplier’s name, address,

telephone number, board dimensions, quantity, and the cover-

age area per container. Additional marking shall be provided

when agreed to in writing between purchaser and seller.

15. Keywords

15.1 cover/recover board; laminated rigid foam board; per-

lite; perlite thermal insulation board; roof insulation; thermal

insulation

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned

in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk

of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ﬁve years and

if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards

and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the

responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should

make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above

address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website

(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222

Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/

C728 − 17a (2022)

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摘要：

ASTM C728 - 17a (2022) 是一项由美国材料与试验协会发布的关于膨胀珍珠岩隔热板的标准规范，适用于建筑与工业领域中的非结构性隔热应用。该标准详细规定了珍珠岩板的分类、物理性能要求、尺寸公差、测试方法以及验收条件，特别结合了2022年的最新修订内容，以提升材料的长期稳定性和耐热性能。遵循此标准的产品常用于屋顶、烟囱、低温储罐等高温或防火环境，确保隔热效率与施工安全性。本规范是工程师、采购方与承包商选择与验证珍珠岩板质量的重要技术依据。

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