ASTM C686 - 17 (2023)

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Designation: C686 −17 (Reapproved 2023)
Standard Test Method for
Parting Strength of Mineral Fiber Batt- and Blanket-Type
Insulation
1
This standard is issued under the ﬁxed designation C686; 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
1.1 This test method covers evaluation of strength in tension
on mineral ﬁber batt- and blanket-type insulation products. It is
useful for determining the comparative tensile properties of
these products, specimens of which cannot be held by the more
conventional clamp-type grips. This is a quality control
method, and the results shall not be used for design purposes.
It is not suitable for board-type products.
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 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
C167 Test Methods for Thickness and Density of Blanket or
Batt Thermal Insulations
E171 Practice for Conditioning and Testing Flexible Barrier
Packaging
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
3. Signiﬁcance and Use
3.1 Tensile strength is a fundamental property associated
with mineral ﬁber manufacture since it is inﬂuenced by the
type of ﬁber, the deposition of ﬁber, the type and the amount of
bonding agent, and the method of curing the resin to form a
bonded insulation product. The test is an indication of product
integrity and the ability of the product to be successfully
handled and applied in the ﬁeld.
4. Apparatus
4.1 Constant Rate of Traverse Tension Test Unit of 50-lbf
(223-N) capacity calibrated in increments of 0.1 lbf (0.4 N) and
having a moving head speed of 12 in. (305 mm)/min or
equivalent (see Fig. 1).
4.2 Post-Type Grips with 1-in. (25.4-mm) diameter rods
(see Fig. 2).
4.3 Die for cutting specimens (see Fig. 3). The O-ring
specimen dimensions are 3 by 4.75 in. (76 by 120.6 mm) in
outside diameter, and 1 by 2.75 in. (25 by 69.8 mm) in inside
diameter (see Fig. 4).
4.4 Balance to weigh to an accuracy of 0.01 g.
5. Test Specimen
5.1 The test specimen shall consist of the entire O-ring cut
from the full thickness of the product to be tested.
5.2 Specimens shall not be cut from a product that varies in
thickness 65 % from normal when tested in accordance with
Test Method C167.
5.3 No specimen shall be tested that exhibits any obvious
damage in the insulation or that shows delamination within the
insulation thickness.
6. Conditioning
6.1 Condition the specimens for 1 h in a room maintained at
atmospheric conditions of 73.4 61.8°F (23 61°C) and 50 6
2 % relative humidity in accordance with Speciﬁcation E171.
7. Procedure
7.1 Weigh each specimen to the nearest 0.01 g and record
the weight.
1
This test method is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.32 on Mechanical
Properties.
Current edition approved March 1, 2023. Published March 2023. Originally
approved in 1971. Last previous edition approved in 2017 as C686 – 17. DOI:
10.1520/C0686-17R23.
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

7.2 Attach the post-type grips to the tension test unit and

align the grips in the vertical plane.

7.3 Adjust the speed of the moving head to 12 in. (305

mm)/min.

7.4 Set the stops of the moving head until the grips are

approximately

⁄

in. (6.3 mm) apart in the starting position.

7.5 Place the specimen on the post-type grip (higher density

side ﬁrst if it is evident that such exists) so that both posts are

within the oblong hole of the specimen. The high density side

of the specimen shall be in contact with the post shield.

7.6 Apply the load; read and record the maximum load to

failure to the nearest 0.1 lbf (0.4 N).

7.7 Test ten specimens each cut in the machine and cross-

machine directions. If the machine direction is not readily

determinable, refer to the longest dimension of the sample to

be tested as lengthwise and call the shortest dimension cross-

wise.

8. Calculation

8.1 Calculate the parting strength, S, in grams per gram as

follows:

L×453.59

/W(1)

FIG. 1 Tension Test Units

FIG. 2 Post-Type Grips

FIG. 3 Specimen Die Cutter

C686 − 17 (2023)

where:

L= breaking load, lbf, and

W= weight of specimen, g.

9. Report

9.1 The report shall include the following:

9.1.1 Thickness and density of the product being reported in

accordance with Test Method C167,

9.1.2 Weight and load at failure of each specimen,

9.1.3 Calculated parting strength for each specimen,

9.1.4 Total number of specimens tested in both the machine

and cross-machine direction, and

9.1.5 Average of the parting strength in the machine and

cross-machine direction.

10. Precision and Bias

10.1 Precision—An interlaboratory round robin involving

four laboratories and three specimens was conducted in 1988.

Specimens were tested in both machine and crossmachine

directions. The three mineral ﬁber samples were typical of

current production. Table 1 gives the results of the round robin

which were analyzed using Practice E691 guidelines.

10.2 Bias—Since there are no reference materials available

for this test method, it is not possible to estimate bias.

11. Keywords

11.1 insulation; physical strength; tensile strength

Supporting data have been ﬁled at ASTM International Headquarters and may

be obtained by requesting Research Report RR:16-1013.

FIG. 4 Test Specimen

C686 − 17 (2023)

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摘要：

ASTM C686 - 17 (2023) 是一项由美国材料与试验协会（ASTM）制定的标准测试方法，专门用于测定矿物纤维绝缘材料在垂直振动作用下的抗降解性能。该标准适用于松散填充、毡状或板状矿物纤维制品，通过模拟运输、安装及使用中的实际振动条件，评估材料在动态环境中的结构完整性与纤维脱落风险。2023年再次确认版本进一步明确了试样制备、振动频率与持续时间等关键参数，确保测试结果的重复性与可比性。对于关注建筑保温、工业隔热及环保材料稳定性的工程师和质检人员而言，准确执行该标准可有效预测产品在实际

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ASTM C686 - 17 (2023)

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