ASTM C1511-15(2021)

Standard Test Method for Determining the Water Retention (Repellency) Characteristics of Fibrous Glass Insulation (Aircraft Type)

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.
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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

• Status: Published
• Publication Date: 31-Aug-2021
• ICS: 49.025.40 - Rubber and plastics
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.33 - Insulation Finishes and Moisture

Relations

• Refers: ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2024
• Refers: ASTM C390-08(2024) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Mar-2024
• Refers: ASTM C800-19 - Standard Specification for Fibrous Glass Blanket Insulation (Aircraft Type)
• Effective Date: 01-Sep-2019
• Refers: ASTM C390-08(2019) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Sep-2019
• Refers: ASTM C168-18 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2018
• Refers: ASTM C168-17 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 01-Jun-2017
• Refers: ASTM C168-15a - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Oct-2015
• Refers: ASTM C168-15 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 01-Jun-2015
• Refers: ASTM C800-14 - Standard Specification for Fibrous Glass Blanket Insulation (Aircraft Type)
• Effective Date: 01-Feb-2014
• Refers: ASTM C390-08(2013) - Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
• Effective Date: 01-Nov-2013
• Refers: ASTM E691-13 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-May-2013
• Refers: ASTM C168-13 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 01-Apr-2013
• Refers: ASTM E691-11 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Nov-2011
• Refers: ASTM C168-10 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 01-Jan-2010
• Refers: ASTM C168-08b - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Dec-2008

Overview

ASTM C1511-15(2021) is the established standard test method for determining the water retention (repellency) characteristics of fibrous glass insulation used in aircraft. Developed by ASTM International, this standard outlines a laboratory procedure for evaluating the water absorption potential of blanket insulation materials for aircraft applications. By assessing how much water insulation material can retain, it provides a critical measurement for understanding potential weight increase and its impact on insulation properties, which is particularly important for aviation safety and efficiency.

Key Topics

• Purpose: The core goal of ASTM C1511-15(2021) is to objectively measure the water absorption and retention characteristics of fiberglass insulation, helping manufacturers and operators gauge the risk of increased weight and degradation in insulation performance due to moisture.
• Test Method Summary:
  • Specimens are weighed, submerged in de-ionized (or distilled) water for a set period, drained, and then reweighed.
  • Water retention is calculated as the difference between the original and final specimen weights, providing a quantitative value in grams.
• Applicability: The method is particularly suitable for laboratory settings, where blanket insulation used in aircraft is evaluated in a controlled manner.
• Limitations:
  • Results may be influenced by factors such as water temperature or material contamination, which are not fully represented in the standard method.
  • The test does not address all safety and environmental concerns; users must apply appropriate practices and consider regulatory requirements.
• Units of Measurement: Inch-pound units are standard. SI values are informational only.

Applications

• Aircraft Insulation Quality Control: Reliable determination of water repellency ensures that aircraft insulation materials do not retain excess moisture, which might otherwise degrade their properties and increase aircraft weight, affecting fuel efficiency and safety.
• Product Development and Benchmarking: Manufacturers of fibrous glass insulation utilize this test method to validate material performance, compare products, and demonstrate compliance with stringent aircraft industry requirements.
• Maintenance and Safety Assessments: Maintenance teams and regulatory bodies may use ASTM C1511-15(2021) data to evaluate in-service insulation materials, contributing to decisions about replacement, refurbishment, or continued usage.
• Procurement Specifications: Purchasers and specifiers of aircraft insulation reference ASTM C1511-15(2021) to ensure that sourced materials meet established performance thresholds for water repellency.

Related Standards

Several other ASTM standards are referenced or applicable alongside ASTM C1511-15(2021):

• ASTM C168: Terminology Relating to Thermal Insulation - Offers standardized definitions crucial for interpreting the test method's scope and results.
• ASTM C390: Practice for Sampling and Acceptance of Thermal Insulation Lots - Defines proper procedures for sampling insulation materials for testing.
• ASTM C800: Specification for Fibrous Glass Blanket Insulation (Aircraft Type) - Specifies material requirements for aircraft insulation products.
• ASTM E691: Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method - Ensures consistency and reliability of test results across different laboratories.

ASTM C1511-15(2021) is a vital tool in the field of aviation, supporting the consistent production and application of safe, high-performance fibrous glass insulation. It helps ensure compliance with international quality expectations and supports the ongoing safety and reliability of modern aircraft insulation systems.

Standards Content (Sample)

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.
Designation: C1511 − 15 (Reapproved 2021)
Standard Test Method for
Determining the Water Retention (Repellency)
Characteristics of Fibrous Glass Insulation (Aircraft Type)
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 C800 Specification for Fibrous Glass Blanket Insulation
(Aircraft Type)
1.1 This test method covers a laboratory procedure for
E691 Practice for Conducting an Interlaboratory Study to
evaluating the water absorption potential of blanket insulation
Determine the Precision of a Test Method
for aircraft, thereby providing a measure of potential weight
increase due to water retention in an aircraft.
3. Terminology
1.2 The water repellency (or retention) characteristics of
3.1 Definitions—Terminology C168 shall be considered as
materials can be affected by conditions such as contamination
applying to the terms used in this specification.
or temperature of the water. Values obtained as a result of this
test method does not adequately describe the water repellency
4. Summary of Test Method
characteristics of materials subject to these conditions.
4.1 The insulation is weighed then submerged in de-ionized
1.3 The values stated in inch-pound units are to be regarded
(or distilled) water for 15 min; it is drained for 60 s and
as standard. The values given in parentheses are mathematical
reweighed. The amount of water retained is the difference in
conversions to SI units that are provided for information only
specimen weights and is expressed in grams.
and are not considered standard.
5. Significance and Use
1.4 This standard does not purport to address all of the
5.1 The water retention of the insulation can result in an
safety concerns, if any, associated with its use. It is the
increase in weight and a resultant potential degradation in the
responsibility of the user of this standard to establish appro-
properties of the insulation.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
6. Apparatus
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- 6.1 The water repellency test apparatus is shown in Fig. 1.
ization established in the Decision on Principles for the
6.2 Scale, accurate to 0.1 g.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
7. Sampling, Test Specimens, and Test Units
Barriers to Trade (TBT) Committee.
7.1 Three specimens shall be tested, taken from across the
width of a representative package. Sampling techniques shall
2. Referenced Documents
be in accordance with Practice C390.
2.1 ASTM Standards:
7.2 The specimens shall be 10- by 10-in. (254- by 254-mm)
C168 Terminology Relating to Thermal Insulation
by full sample thickness; samples shall be no thicker than 4-in.
C390 Practice for Sampling and Acceptance of Thermal
(100-mm)
Insulation Lots
7.3 The insulation shall be tested without facing or jacket-
ing.
This test method is under the jurisdiction ofASTM Committee C16 on Thermal
8. Conditioning
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
Finishes and Moisture.
8.1 No conditioning of the specimen is required.
Current edition approved Sept. 1, 2021. Published October 2021. Originally
approved in 2001. Last previous edition approved in 2015 as C1511 – 15. DOI:
9. Procedure
10.1520/C1511-15R21.
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