ASTM C739-24 纤维素纤维(木基)的疏松填充绝热材料

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Designation: C739 −24
Standard Speciﬁcation for
Cellulosic Fiber Loose-Fill Thermal Insulation
1
This standard is issued under the ﬁxed designation C739; 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
requirements of chemically treated, recycled cellulosic ﬁber
loose-ﬁll type thermal insulation for use in attics or enclosed
spaces in housing, and other framed buildings within the
ambient temperature range from −45 to 90°C by pneumatic or
pouring application. While products that comply with this
speciﬁcation are used in various constructions, they are adapt-
able primarily, but not exclusively, to wood joist, rafters, and
stud construction.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
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 appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.4 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 ASTM Standards:
2
B152/B152M Speciﬁcation for Copper Sheet, Strip, Plate,
and Rolled Bar
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
C518 Test Method for Steady-State Thermal Transmission
Properties by Means of the Heat Flow Meter Apparatus
C687 Practice for Determination of Thermal Resistance of
Loose-Fill Building Insulation
C1114 Test Method for Steady-State Thermal Transmission
Properties by Means of the Thin-Heater Apparatus
C1338 Test Method for Determining Fungi Resistance of
Insulation Materials and Facings
C1363 Test Method for Thermal Performance of Building
Materials and Envelope Assemblies by Means of a Hot
Box Apparatus
C1374 Test Method for Determination of Installed Thick-
ness of Pneumatically Applied Loose-Fill Building Insu-
lation
C1485 Test Method for Critical Radiant Flux of Exposed
Attic Floor Insulation Using an Electric Radiant Heat
Energy Source
C1630 Guide for Development of Coverage Charts for
Loose-Fill Thermal Building Insulations
E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
E970 Test Method for Critical Radiant Flux of Exposed Attic
Floor Insulation Using a Radiant Heat Energy Source
3. Terminology
3.1 Deﬁnitions—For deﬁnitions of terms used in this
speciﬁcation, see Terminology C168.
3.2 Deﬁnitions of Terms Speciﬁc to This Standard:
3.2.1 attic—an enclosed space between the roof and ceiling
of the occupied part of a building.
3.2.2 critical radiant ﬂux—the level of incident radiant heat
energy on the attic ﬂoor insulation system at the most distant
ﬂame-out point (W/cm
2
).
4. Materials and Manufacture
4.1 The basic material shall be recycled cellulosic ﬁber
made from selected paper, paperboard stock, or ground wood
stock, excluding contaminated materials, which may reason-
ably be expected to be retained in the ﬁnished product. Suitable
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 March 1, 2024. Published March 2024. Originally
approved in 1973. Last previous edition approved in 2021 as C739 – 21a. DOI:
10.1520/C0739-24.
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

chemicals are introduced to provide properties such as ﬂame
resistance, processing, and handling characteristics.
4.2 The basic material may be processed into a form
suitable for installation by pneumatic or pouring methods.
5. Physical and Chemical Properties
5.1 Design Density—The design density shall be determined
in accordance with Section 8. Report all units in kg/m
3
.
5.1.1 Design density is not a basis for acceptance or
rejection.
5.2 Corrosiveness—The loose-ﬁll insulation material shall
be tested for corrosiveness as speciﬁed in Section 9. The
composition of the insulation material shall be such that after
testing, no perforation of the 3-mil (76-µm) metal specimens
shall be evident when the specimens are observed over a 40-W
appliance light bulb. Notches extending into the coupon 3 mm
or less from any edge shall be ignored.
5.3 Critical Radiant Flux—When tested in accordance with
Section 10, the critical radiant ﬂux shall be ≥0.12 W/cm
2
. All
values shall be reported to two signiﬁcant digits.
5.4 Fungi Resistance—The loose-ﬁll insulation material
shall be tested and shall pass fungi resistance as speciﬁed in
Section 11. If the growth on two or more of the replicate test
items is greater than that on the comparative item, the test item
shall be considered to fail.
NOTE 1—If the manufacturing claims the insulation kills or controls
insects or rodents, or both, the product must be registered as a pesticide
under the Federal Insecticide, Fungicide and Rodentic Act, as amended,
and must also be registered in accordance with state pesticide statutes.
5.5 Moisture Vapor Sorption—Moisture gain in the insula-
tion shall be no more than 15 % by weight when tested in
accordance with Section 12.
5.6 Odor Emission—Any sample producing a detectable
odor that is classiﬁed as objectionable and strong or very strong
by more than two panel members shall be considered to have
failed the test when tested in accordance with Section 13.
5.7 Smoldering Combustion—When tested in accordance
with the smoldering combustion test method in Section 14, the
insulation shall show no evidence of ﬂaming and a weight loss
no greater than 15 %.
5.8 Thermal Resistance—The standard thermal resistance
values normally recommended for open application are: 2.3,
3.4., 3.9, 5.3, 6.7, and 8.6 and are expressed in K·m
2
/W. The
thermal resistance Rfor the average of any (four) randomly
selected specimens shall not be more than 5 % below the listed
Rvalue when tested in accordance with Section 15.Rvalues
other than those listed shall be as agreed upon between the
supplier and the purchaser.
6. Workmanship, Finish, and Appearance
6.1 The product shall be free of extraneous foreign materials
such as metals and glass that will adversely affect the perfor-
mance in service.
TEST METHODS
7. Summary
7.1 The following tests shall be conducted on loose-ﬁll
cellulosic insulation at the measured design density: moisture
vapor sorption, smoldering combustion, and thermal resis-
tance.
NOTE 2—The importance of an insulation’s product to maintain its ﬁre
retardant characteristics is recognized. A task group in ASTM C16.31 is
currently studying methods to ascertain if there is a long-term deteriora-
tion of ﬁre performance characteristics of cellulose insulation. Should the
need for a permanency test be determined by this task group and a test
method be developed and ﬁnalized, it will become a part of this
speciﬁcation.
8. Design Density
8.1 Scope—This test method provides a basis for calculating
the product coverage values and for conducting physical
property tests requiring the use of design density for sample
preparation.
8.2 Signiﬁcance and Use—The design density is the ap-
proximate density expected after long-term attic application.
8.3 Apparatus and Materials:
8.3.1 Insulation Specimen Container—A beaker having a
ﬂat bottom and an inside diameter of 15.0 61 cm, straight
sides. The height of the beaker shall be such that the distance
between the bottom of the cyclone and the top edge of the
beaker is 8.50 61.0 cm.
8.3.2 Flat Rigid Disk, having a total weight of 75 65 g and
of a suitable diameter to ﬁt loosely into the specimen container.
Weight may be added to the center of the disk to bring the total
weight to the required 75 65 g.
8.3.3 Balance, having a 2-kg capacity accurate to 60.2 g.
8.3.4 Blower Apparatus, having two blower units (supply
and overﬂow) meeting the following speciﬁcations:
8.3.4.1 Each blower apparatus shall be capable of blowing
an average of 272.2 kg of insulation per hour.
8.3.4.2 Each blower apparatus shall have a nominal air ﬂow
velocity of 0.38 m/s.
8.3.4.3 Each blower apparatus shall have a nominal motor
speed of 16 450 r/min at 115 V (a-c).
8.3.5 Shaker Unit, having a capability of shaking 4.5 kg of
weight with a vertical motion of 0.5 g rms acceleration at an
approximate frequency of 9 Hz and displacement of approxi-
mately 1.17 60.08 cm.
8.3.6 Fill Chamber, having inside dimensions of 45.7 cm
high by 38.1 cm wide by 38.1 cm deep, with covered openings
that will allow a radiant panel tray to be slid through the
chamber (see Fig. 1).
8.3.7 Cyclone Receiver—See Fig. 2.
8.3.8 Hose—Various lengths of nominal 5.08-cm diameter
hose (see Fig. 1):
8.3.8.1 Supply Source Hose, 274.3 65.1 cm.
8.3.8.2 Cyclone Receiver Hose, 182.9 65.1 cm.
8.3.8.3 Fill Chamber Exit Hose, 91.4 65.1 cm.
8.3.8.4 Overﬂow Exhaust Hose, length as needed.
8.3.9 Blower Controls, having capability of operating the
two blowers at 40 V rms and 12 A.
C739 − 24
2

8.3.10 Insulation Holding Container, capable of holding

four times the amount of insulation required to ﬁll the

specimen container.

8.3.11 Garden Rake, with steel teeth.

8.4 Conditioning:

8.4.1 Condition specimens to equilibrium at 21 62.0°C and

50 65 % relative humidity in an open top mesh bottom

container not exceeding 10.16 cm in depth and position in such

a way to allow free movement of air on exposed sides. A

change in net weight of the specimen that is less than 1 % in

two consecutive weighings with 24 h between each weighing

constitutes equilibrium.

8.4.2 If ambient laboratory conditions are different from the

conditioning requirements speciﬁed in 8.4.1, begin testing the

specimen for design density within 10 min after it has been

removed from the conditioned area.

8.5 Procedure for Pneumatic Applications:

8.5.1 Conduct the test in an area conditioned in accordance

with 8.4.1.

8.5.2 Blow the material through a commercial blower using

30.48 m of 5.08 cm hose into a sample receiver while holding

the hose horizontally at a height of four feet.

8.5.3 Set up the apparatus as shown in Fig. 1. Connect one

end of the supply source hose to the intake of the supply

blower. Use the other end of the supply source hose to pick up

insulation from the holding container. Connect one end of the

cyclone receiver hose to the outlet of the supply blower and the

other end to the ﬁll chamber. Place the ﬁll chamber on a ﬂat

and level surface. Connect one end of the variable length

overﬂow exhaust hose to the outlet of the overﬂow blower.

Conveniently place the other end to reduce insulation dust in

the test area.

8.5.4 Weigh the empty insulation specimen container and

record its weight.

8.5.5 Place the empty insulation specimen container in the

ﬁll chamber, centered under the cyclone receiver, and close the

front cover.

8.5.6 Adjust the blower control(s) so that the supply and

overﬂow blowers will operate at a no-load voltage of 40 V rms.

FIG. 1 Partial Insulation Preparation Apparatus

FIG. 2 Cyclone Receiver Weldment

C739 − 24

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标签： #纤维 #素纤维 #木基

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ASTM C739-2024 Standard Specification for Cellulosic Fiber Loose-Fill Thermal Insulation 纤维素纤维(木基)的疏松填充绝热材料

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ASTM C739-24 纤维素纤维(木基)的疏松填充绝热材料

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