ASTM C1511 - 15 (2021)

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Designation: C1511 −15 (Reapproved 2021)
Standard Test Method for
Determining the Water Retention (Repellency)
Characteristics of Fibrous Glass Insulation (Aircraft Type)
1
This standard is issued under the ﬁxed designation C1511; 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 a laboratory procedure for
evaluating the water absorption potential of blanket insulation
for aircraft, thereby providing a measure of potential weight
increase due to water retention in an aircraft.
1.2 The water repellency (or retention) characteristics of
materials can be affected by conditions such as contamination
or temperature of the water. Values obtained as a result of this
test method does not adequately describe the water repellency
characteristics of materials subject to these conditions.
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 ASTM Standards:
2
C168 Terminology Relating to Thermal Insulation
C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots
C800 Speciﬁcation for Fibrous Glass Blanket Insulation
(Aircraft Type)
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
3. Terminology
3.1 Deﬁnitions—Terminology C168 shall be considered as
applying to the terms used in this speciﬁcation.
4. Summary of Test Method
4.1 The insulation is weighed then submerged in de-ionized
(or distilled) water for 15 min; it is drained for 60 s and
reweighed. The amount of water retained is the difference in
specimen weights and is expressed in grams.
5. Signiﬁcance and Use
5.1 The water retention of the insulation can result in an
increase in weight and a resultant potential degradation in the
properties of the insulation.
6. Apparatus
6.1 The water repellency test apparatus is shown in Fig. 1.
6.2 Scale, accurate to 0.1 g.
7. Sampling, Test Specimens, and Test Units
7.1 Three specimens shall be tested, taken from across the
width of a representative package. Sampling techniques shall
be in accordance with Practice C390.
7.2 The specimens shall be 10- by 10-in. (254- by 254-mm)
by full sample thickness; samples shall be no thicker than 4-in.
(100-mm)
7.3 The insulation shall be tested without facing or jacket-
ing.
8. Conditioning
8.1 No conditioning of the specimen is required.
9. Procedure
9.1 Weigh each specimen to the nearest 0.1 g.
9.2 Float each specimen on the surface of a vat of de-
ionized (or distilled) water at 70 64°F (21 62°C). Lay a
1
This test method is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
Finishes and Moisture.
Current edition approved Sept. 1, 2021. Published October 2021. Originally
approved in 2001. Last previous edition approved in 2015 as C1511 – 15. DOI:
10.1520/C1511-15R21.
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

0.25-in. (6.4-mm) mesh rigid screen on top of each specimen

and slowly submerge it to a level that is 5 in. (127 mm) below

the surface of the water. Fix the screen in position as shown in

Fig. 1. After 15 61 min, release the screen and raise the

specimens slowly until they ﬂoat. Remove the screen. Grip

each specimen on one corner with a spring clamp and hang it

in a vertical position for 60 65 s. Reweigh each specimen and

record.

10. Calculation or Interpretation of Results

10.1 Determine water retained by each specimen by sub-

tracting the original specimen weight from the ﬁnal specimen

weight. Calculate water repellency by averaging the results of

the three specimens.

11. Report

11.1 The report shall include the following:

11.2 Name and any additional identiﬁcation of the material

tested,

11.3 Thickness of the material,

11.4 Number of specimens tests, and

11.5 Average weight gain of the specimens.

12. Precision and Bias

12.1 Interlaboratory Test Program—An interlaboratory

comparison was run in which randomly selected test specimens

of one material were tested for water repellency. Four labora-

tories participated, with each laboratory testing three speci-

mens. Practice E691 was followed for the design and analysis

of the data. All of the test specimens were provided by a single

laboratory. The details are given in ASTM Research Report:

C16-1017.

12.2 Test Results—The following information on precision,

in units of measurement noted, is for the comparison of one

material and is based on an average of three tests.

12.3 Precision—Water repellency interlaboratory compari-

son statistical results using Practice E691:

x 13.0 g

2.1

4.1

r11.5

R11.5

12.4 Bias—There is no accepted reference material suitable

for determining the bias for this procedure. Bias has not been

determined.

13. Keywords

13.1 aircraft; aircraft insulation; ﬁbrous glass insulation;

water repellency

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/

Available from ASTM Headquarters, request RR:C16-1017.

FIG. 1 Water Repellency Test Apparatus

C1511 − 15 (2021)

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了解 ASTM C1511 - 15 (2021) 标准，该规范适用于评估建筑用反射型隔热材料的辐射反射性能与热阻特性，提供统一测试方法与技术要求。标准覆盖材料在稳态条件下的热性能测量，确保隔热产品在节能建筑中的可靠应用。最新2021年版本整合了实验精度要求与操作流程优化，适用于制造商、检测机构与工程设计人员参考使用。

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