Standard Test Method for Tensile Testing of Aramid Paper

SIGNIFICANCE AND USE
5.1 The levels of tensile properties obtained when testing aramid paper are dependent on the age and history of the specimen and on the specific conditions used during the test. Among these conditions are rate of stretching, type of clamps, gauge length of specimen, temperature and humidity of the atmosphere, rate of airflow across the specimen, and temperature and moisture content of the specimen. Testing conditions accordingly are specified precisely to obtain reproducible test results on a specific sample.  
5.2 Tensile strength is used in engineering calculations when designing various types of products.  
5.3 Elongation of the paper is taken into consideration in the design and engineering of reinforced products because of its effect on uniformity of the finished product and its dimensional stability during service.  
5.4 Stiffness is a measure of the resistance of the paper to extension as a force is applied.  
5.5 Tensile Energy Absorption is dependent on the relationship of force to elongation. It is a measure of the ability of a textile structure to absorb mechanical energy. Tensile Energy Absorption is work-to-break per area.  
5.6 It should be emphasized that, although the preceding parameters are related to the performance of the product, the actual configuration of the product is significant. Shape, size, and internal construction also can have appreciable effects on product performance. It is not possible, therefore, to evaluate the performance of the end product in terms of the reinforcing material alone.  
5.7 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assign...
SCOPE
1.1 This test method covers the tensile testing of aramid paper with thickness less than 1 mm. This test method includes testing procedures only and includes no specifications or tolerances.  
1.2 The procedures given in this test method are for use with computer-controlled constant-rate-of-elongation tensile testing equipment.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

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Publication Date
31-Dec-2015
Current Stage
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ASTM D7812-16 - Standard Test Method for Tensile Testing of Aramid Paper
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7812 − 16
Standard Test Method for
1
Tensile Testing of Aramid Paper
This standard is issued under the fixed designation D7812; 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 3. Terminology
3.1 For definitions of other terms related to textiles, refer to
1.1 This test method covers the tensile testing of aramid
Terminology D123.
paper with thickness less than 1 mm.This test method includes
testing procedures only and includes no specifications or
3.2 For definitions of terms related to force and deformation
tolerances.
in textiles, refer to Terminology D6477.
3.3 Definitions:
1.2 Theproceduresgiveninthistestmethodareforusewith
computer-controlled constant-rate-of-elongation tensile testing 3.3.1 aramid paper, n—planar structures deposited from an
aqueous suspension that has a thickness less than 1 mm
equipment.
containing at least 50 mass percent aramid.
1.3 The values stated in SI units are to be regarded as
3.4 The following terms are relevant to this standard:
standard. No other units of measurement are included in this
breaking force, elongation, initial modulus, tensile strength,
standard.
and Tensile Energy Absorption.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 A conditioned sample of aramid paper is clamped in a
priate safety and health practices and determine the applica-
tensile testing machine and then stretched or loaded until
bility of regulatory limitations prior to use.
broken.
4.2 The output of a constant-rate-of-extension (CRE) tensile
2. Referenced Documents
testingmachinecanbeconnectedwithelectronicrecordingand
2
2.1 ASTM Standards:
computing equipment, which may be programmed to calculate
D76 Specification for Tensile Testing Machines for Textiles
and print the test results of tensile properties of interest.
D123 Terminology Relating to Textiles
4.3 Breaking force and elongation are determined directly.
D202 Test Methods for Sampling and Testing Untreated
Modulus and Tensile Energy Absorption are calculated from
Paper Used for Electrical Insulation
the force-elongation curve.
D374M Test Methods for Thickness of Solid Electrical
Insulation (Metric)
5. Significance and Use
D1776 Practice for Conditioning and Testing Textiles
5.1 The levels of tensile properties obtained when testing
D6477 Terminology Relating to Tire Cord, Bead Wire, Hose
aramid paper are dependent on the age and history of the
Reinforcing Wire, and Fabrics
specimen and on the specific conditions used during the test.
E691 Practice for Conducting an Interlaboratory Study to
Among these conditions are rate of stretching, type of clamps,
Determine the Precision of a Test Method
gauge length of specimen, temperature and humidity of the
E177 Practice for Use of the Terms Precision and Bias in
atmosphere, rate of airflow across the specimen, and tempera-
ASTM Test Methods
ture and moisture content of the specimen. Testing conditions
accordingly are specified precisely to obtain reproducible test
results on a specific sample.
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.19 on Industrial Fibers and
5.2 Tensile strength is used in engineering calculations
Metallic Reinforcements.
when designing various types of products.
Current edition approved Jan. 1, 2016. Published February 2016. DOI: 10.1520/
D7812–16.
5.3 Elongationofthepaperistakenintoconsiderationinthe
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
design and engineering of reinforced products because of its
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
effect on uniformity of the finished product and its dimensional
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. stability during service.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7812 − 16
5.4 Stiffness is a measure of the resistance of the paper to not comply with the requirements for a specimen cutter for
extension as a force is applied. purposes of this test method.
5.5 Tensile EnergyAbsorption is dependent on the relation-
7. Sampling, Test Specimens
ship of force to elongation. It is a measure of the ability of a
7.1 For acceptance testing, sample each lot as directed in
textile structure to absorb mechanical en
...

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