SYMPOSIA PAPER Published: 01 January 2004

The Flow Ratio Effect on Oriented, Crosslinked Ultra-High Molecular Weight Polyethylene (UHMWPE)


The compression molding process is known to produce UHMWPE components of improved oxidation resistance [1] and quality surface finish. Induction of molecular orientation in non-crosslinked UHMWPE was demonstrated by using a slot drawing process [2]. The objective of this study was to assess the effect of flow ratio on wear and mechanical properties of crosslinked UHMPWE. Pre-irradiated GUR 1020 preforms, corresponding to flow ratios from 1.06 to 1.40, were evaluated in this study. Molecular orientation was shown by Thermal Mechanical Analysis and crossed polarizer microphotographs. Tensile (Type V), double notched Izod and pin on disk wear data were generated. The degree of molecular orientation was correlated with the flow ratio and was reflected by the enhancement of the mechanical properties. Pin on disk wear data show that there was no significant difference in wear resistance between oriented, crosslinked UHMWPE and its machined counterpart.

Author Information

King, RS
DePuy Orthopedics, Warsaw, IN
Young, SK
DePuy Orthopedics, Warsaw, IN
Greer, KW
DePuy Orthopedics, Warsaw, IN
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Developed by Committee: F04
Pages: 183–191
DOI: 10.1520/STP11930S
ISBN-EB: 978-0-8031-5492-6
ISBN-13: 978-0-8031-3474-4