EXTRUSION RESISTANCE OF ELASTOMERS: A STUDY OF FACTORS THAT AFFECT PERFORMANCE

摘要

The importance of extrusion resistance for elastomers designed for high pressure / high temperature (HPHT) applications is well known in the Oil and Gas industry. Whilst elastomer mouldings can be given enhanced pressure capabilities through the use of metal or plastic parts, elastomers with increased levels of extrusion resistance at high temperatures will benefit the industry. This paper describes a simple method for evaluating extrusion resistance and studies fluorocarbon (FKM) and hydrogenated nitrile (HNBR) compounds at different temperatures and extrusion gaps. It also considers any correlation between standard laboratory test data and failure conditions. Having benchmarked those elastomers which use 'conventional' compounding technology, modifications will be made to improve their performance using a number of techniques. Finally, an assessment of the maximum extrusion resistance that may be expected from an elastomer at elevated temperatures whilst maintaining a balance of elastomeric properties will conclude the paper.