ASTM G137-97(2003)

Standard Test Method for Ranking Resistance of Plastic Materials to Sliding Wear Using a Block-On-Ring Configuration

SIGNIFICANCE AND USE
The specific wear rates determined by this test method can be used as a guide in ranking the wear resistance of plastic materials. The specific wear rate is not a material property and will therefore differ with test conditions and test geometries. The significance of this test will depend on the relative similarity to the actual service conditions.
This test method seeks only to describe the general test procedure and the procedure for calculating and reporting data.
Note 2—This test configuration allows steady state specific wear rates to be achieved very quickly through the use of high loads and speeds. The thrust washer configuration described in Test Method D 3702 does not allow for the use of such high speeds and loads because of possible overheating (which may cause degradation or melting, or both) of the specimen. Despite the differences in testing configurations, a good correlation in the ranking of wear resistance is achieved between the two tests (Table X2.1).
SCOPE
1.1 This test method covers a laboratory procedure to measure the resistance of plastic materials under dry sliding conditions. The test utilizes a block-on-ring geometry to rank materials according to their sliding wear characteristics under various conditions.
1.2 The test specimens are small so that they can be molded or cut from fabricated plastic parts. The test may be run at the load, velocity, and temperature which simulate the service condition.
1.3 Wear test results are reported as specific wear rates calculated from volume loss, sliding distance, and load. Materials with superior wear resistance have lower specific wear rates.
1.4 This test method allows the use of both single- and multi-station apparatus to determine the specific wear rates.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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

• Status: Historical
• Publication Date: 09-Jun-2003
• Technical Committee: G02 - Wear and Erosion
• Drafting Committee: G02.40 - Non-Abrasive Wear

Relations

• Replaces: ASTM G137-97 - Standard Test Method for Ranking Resistance of Plastic Materials to Sliding Wear Using a Block-On-Ring Configuration
• Effective Date: 10-Jun-2003
• Replaced By: ASTM G137-97(2009) - Standard Test Method for Ranking Resistance of Plastic Materials to Sliding Wear Using a Block-On-Ring Configuration
• Effective Date: 01-May-2009
• Referred By: ASTM G115-10(2018) - Standard Guide for Measuring and Reporting Friction Coefficients
• Effective Date: 10-Jun-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G 137 – 97 (Reapproved 2003)
Standard Test Method for
Ranking Resistance of Plastic Materials to Sliding Wear
1
Using a Block-On-Ring Configuration
This standard is issued under the fixed designation G137; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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1. Scope ASTM Test Methods
5
G40 Terminology Relating to Wear and Erosion
1.1 This test method covers a laboratory procedure to
G77 Test Method for Ranking Resistance of Materials to
measure the resistance of plastic materials under dry sliding
5
Sliding Wear Using Block-on-Ring Wear Test
conditions. The test utilizes a block-on-ring geometry to rank
G117 Guide for Calculating and Reporting Measures of
materials according to their sliding wear characteristics under
Precision Using Data from Interlaboratory Wear or Ero-
various conditions.
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sion Tests
1.2 Thetestspecimensaresmallsothattheycanbemolded
or cut from fabricated plastic parts. The test may be run at the
3. Terminology
load, velocity, and temperature which simulate the service
3.1 Definitions:
condition.
3.1.1 wear—damage to a solid surface, generally involving
1.3 Wear test results are reported as specific wear rates
progressive loss of material, due to relative motion between
calculated from volume loss, sliding distance, and load. Mate-
that surface and a contacting substance or substances.
rials with superior wear resistance have lower specific wear
3.1.2 Additional definitions relating to wear are found in
rates.
Terminology G40.
1.4 This test method allows the use of both single- and
3.2 Definitions of Terms Specific to This Standard:
multi-station apparatus to determine the specific wear rates.
3.2.1 specific wear rate—the volume loss per unit sliding
1.5 The values stated in SI units are to be regarded as the
distance,dividedbytheload.Itcanbecalculatedasthevolume
standard. The values given in parentheses are for information
loss per unit time, divided by the load and the sliding velocity.
only.
3.2.2 steady state specific wear rate—the specific wear rate
1.6 This standard does not purport to address all of the
that is established during that part of the test when the specific
safety concerns, if any, associated with its use. It is the
wear rate remains substantially constant (the specific wear rate
responsibility of the user of this standard to establish appro-
versusslidingdistancecurveflattensoutconsiderablywithless
priate safety and health practices and determine the applica-
than 30% difference between the specific wear rates) during a
bility of regulatory limitations prior to use.
minimumofthreetimeintervalsspanningatotaltimeduration
2. Referenced Documents of at least 18 h, with ideally no single interval exceeding 8 h.
However, one time interval during the steady state can be as
2.1 ASTM Standards:
2 long as 16 h.
D618 Practice for Conditioning Plastics for Testing
D3702 Test Method for Wear Rate and Coefficient of
4. Summary of Test Method
Materials in Self-Lubricated Rubbing Contact Using a
3 4.1 A plastic block of known dimensions is brought into
Thrust Washer Testing Machine
contact with a counterface ring (usually metal) under con-
E122 Practice for Calculating Sample Size to Estimate,
trolledconditionsofcontactpressureandrelativevelocity.This
With a Specified Tolerable Error, the Average for Charac-
4
isachievedusingablock-on-ringconfigurationasillustratedin
teristic of a Lot or Process
Fig. 1. Periodic weighing of the polymer block results in a
E177 Practice for Use of the Terms Precision and Bias in
number of mass-time data points where the time relates to the
timeofsliding.Thetestiscontinueduntilthesteadystatewear
1
rate is established. Mass loss measurements made after the
This test method is under the jurisdiction of ASTM Committee G02 on Wear
and Erosion and is the direct responsibility of Subcommittee G02.40 on Non- steadystateisestablishedareusedtodeterminethesteadystate
Abrasive Wear.
specific wear rate, which is the volume loss per unit sliding
Current edition approved June 10, 2003. Published July 2003. Originally
distance per unit load. The frictional torque may also be
approved in 1995. Last previous edition appeared in 1997 as G137–97.
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Annual Book of ASTM Standards, Vol 08.01.
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Annual Book of ASTM Standards, Vol 05.02.
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Annual Book of ASTM Standards, Vol 14.02. Annual Book of ASTM Standards, Vol 03.02.
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G 137 – 97 (2003)
FIG. 1 Single Station Block-on-Ring Arrangement
measured durin
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