ASTM G137-97(2009)
(Test Method)Standard Test Method for Ranking Resistance of Plastic Materials to Sliding Wear Using a Block-On-Ring Configuration
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
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Standards Content (Sample)
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Designation:G137 −97 (Reapproved 2009)
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope E122PracticeforCalculatingSampleSizetoEstimate,With
Specified Precision, the Average for a Characteristic of a
1.1 This test method covers a laboratory procedure to
Lot or Process
measure the resistance of plastic materials under dry sliding
G40Terminology Relating to Wear and Erosion
conditions. The test utilizes a block-on-ring geometry to rank
G77Test Method for Ranking Resistance of Materials to
materials according to their sliding wear characteristics under
Sliding Wear Using Block-on-Ring Wear Test
various conditions.
G117Guide for Calculating and Reporting Measures of
1.2 Thetestspecimensaresmallsothattheycanbemolded
Precision Using Data from Interlaboratory Wear or Ero-
or cut from fabricated plastic parts. The test may be run at the
sion Tests
load, velocity, and temperature which simulate the service
condition.
3. Terminology
1.3 Wear test results are reported as specific wear rates
3.1 Definitions:
calculated from volume loss, sliding distance, and load. Mate-
3.1.1 wear—damage to a solid surface, generally involving
rials with superior wear resistance have lower specific wear
progressive loss of material, due to relative motion between
rates.
that surface and a contacting substance or substances.
1.4 This test method allows the use of both single- and
3.1.2 Additional definitions relating to wear are found in
multi-station apparatus to determine the specific wear rates.
Terminology G40.
3.2 Definitions of Terms Specific to This Standard:
1.5 The values stated in SI units are to be regarded as the
3.2.1 specific wear rate—the volume loss per unit sliding
standard. The values given in parentheses are for information
distance,dividedbytheload.Itcanbecalculatedasthevolume
only.
loss per unit time, divided by the load and the sliding velocity.
1.6 This standard does not purport to address all of the
3.2.2 steady state specific wear rate—the specific wear rate
safety concerns, if any, associated with its use. It is the
that is established during that part of the test when the specific
responsibility of the user of this standard to establish appro-
wear rate remains substantially constant (the specific wear rate
priate safety and health practices and determine the applica-
versusslidingdistancecurveflattensoutconsiderablywithless
bility of regulatory limitations prior to use.
than 30% difference between the specific wear rates) during a
minimumofthreetimeintervalsspanningatotaltimeduration
2. Referenced Documents
2 of at least 18 h, with ideally no single interval exceeding 8 h.
2.1 ASTM Standards:
However, one time interval during the steady state can be as
D618Practice for Conditioning Plastics for Testing
long as 16 h.
D3702Test Method for Wear Rate and Coefficient of Fric-
tion of Materials in Self-Lubricated Rubbing Contact
4. Summary of Test Method
Using a Thrust Washer Testing Machine
4.1 A plastic block of known dimensions is brought into
contact with a counterface ring (usually metal) under con-
1
This test method is under the jurisdiction of ASTM Committee G02 on Wear
trolledconditionsofcontactpressureandrelativevelocity.This
and Erosion and is the direct responsibility of Subcommittee G02.40 on Non-
isachievedusingablock-on-ringconfigurationasillustratedin
Abrasive Wear.
Fig. 1. Periodic weighing of the polymer block results in a
Current edition approved May 1, 2009. Published May 2009. Originally
number of mass-time data points where the time relates to the
approved in 1995. Last previous edition appeared in 2003 as G137–97(2003). DOI:
10.1520/G0137-97R09.
timeofsliding.Thetestiscontinueduntilthesteadystatewear
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
rate is established. Mass loss measurements made after the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
steadystateisestablishedareusedtodeterminethesteadystate
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. specific wear rate, which is the volume loss per unit sliding
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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G137−97 (2009)
FIG. 1 Single Station Block-on-Ring Arrangement
distance per unit load. The frictional torque may also be dimensions of th
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