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ASTM F2025-06

Current Revision

Standard Practice for Gravimetric Measurement of Polymeric Components for Wear Assessment

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1.1 This practice describes a laboratory method using a weight-loss (that is, mass-loss; see X1.4) technique for evaluating the wear properties of polymeric materials or devices which are being considered for use as bearing surfaces of human joint replacement prostheses, or both. The test specimens are evaluated in a device intended to simulate the tribological conditions encountered in the human joint; for example, use of a fluid such as bovine serum, or equivalent pseudosynovial fluid shown to simulate similar wear mechanisms and debris generation as found in vivo.


This practice uses a weight-loss method of wear determination for the polymeric components or materials used in human joint prostheses, using serum or demonstrated equivalent fluid for lubrication, and running under a load profile representative of the appropriate human joint application (1,2).4 The basis for this weight-loss method for wear measurement was originally developed (3) for pin-on-disk wear studies (Practice F 732) and has been extended to total hip replacements (4, 5, ISO 142422, and Guide F 1714) and to femoro-tibial knee prostheses (6 and ISO 142432), and to femoro-patellar knee prostheses (6,7).

While wear results in a change in the physical dimensions of the specimen, it is distinct from dimensional changes due to creep or plastic deformation, in that wear results in the removal of material in the form of polymeric debris particles, causing a loss in weight of the specimen.

This practice for measuring wear of the polymeric component is suitable for various simulator devices. These techniques can be used with metal, ceramic, carbon, polymeric, and composite counter faces bearing against a polymeric material (for example, polyethylene, polyacetal, and so forth). Thus, this weight-loss method has universal application for wear studies of human joint replacements which feature polymeric bearings. This weight-loss method has not been validated for non-polymeric material bearing systems, such as metal-metal, carbon-carbon, or ceramic-ceramic. Progressive wear of such rigid bearing combinations has generally been monitored using a linear, variable-displacement transducers, or by other profilometric techniques.

SDO ASTM: ASTM International
Document Number F2025
Publication Date March 1, 2006
Language en - English
Page Count 6
Revision Level 06
Supercedes
Committee F04.22
Publish Date Document Id Type View
March 1, 2006 F2025-06 Revision
May 10, 2000 F2025-00 Revision
April 1, 2018 F2025-06R18 Reaffirmation
Aug. 15, 2012 F2025-06R12 Reaffirmation