||Plastics Resistance to Sliding Wear Determined with Test Method
A new standard being finalized by ASTM Committee G02 on Wear and
Erosion measures the wear resistance, or sliding wear of plastics.
Expected to be available this summer, the proposed Test Method
for Ranking Resistance of Plastics to Sliding Wear Using Block-on-Ring
Wear TestCumulative Wear Method, will apply to thousands of plastic
components from plastic gears used in washing machines to the
plastic casings holding cellular phone antennas.
Created by a task group of ASTM Subcommittee G02.40 on Non-Abrasive
Wear, the standard utilizes a block-on-ring friction and wear
tester that ranks plastics according to their sliding wear characteristics
against metals or other solids. Any material that can be fabricated
into, or applied to blocks and rings can be tested.
The potential material combinations are endless. As well as consumer
appliances, the test method can be used for automotive and aerospace
parts, or any plastic exposed to friction wear. Gears, bearings,
cam shafts, all those are plastic components that experience sliding
wear, says Brian Holtkamp, a mechanical engineer and director
of Testing Services with Falex Corporation, Sugar Grove, Ill.
The task group of mechanical engineers, plastic industry professionals,
and academics specializing in materials testing redesigned a former
block-on-ring test that covered metals as well as plastics. A
longer test time was found to be necessary to produce consistent,
repeatable wear data, says Holtkamp, who co-chairs the task group
with Ray Bayer, a tribology consultant from Vestal, N.Y. The
block-on-ring test geometry on the books for a number of years
was written for both metals and plastics. We found out that the
plastics responded differently. The test can be run with different
gaseous atmospheres and elevated temperatures, as desired, to
simulate service conditions.
ASTM standards are available by calling Customer Service (610/832-9585),
or through the Web site.
For further technical information, contact Brian Holtkamp, Falex Corporation, 1020 Airpark Dr., Sugar Grove, IL 60554 (630/556-3669),
or co-chairman Raymond Bayer, 4609 Marshall Dr. W., Vestal NY 13850 (607/722-7916).
Committee G02 meets Nov. 15-17 in Orlando, Fla. For meeting or
membership details, contact manager Timothy Brooke, ASTM (610/832-9729; fax: 610/832-9666). //
Copyright 2000, ASTM