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Technical Paper

Evaluation of New ACM Polymers in Sealing Applications Using Advances in Compressive Stress Relaxation Test Measurement

2003-03-03
2003-01-0947
The current method for testing and evaluating sealing material candidates is plagued with concerns, issues and problems. Compressive Stress Relaxation (CSR) testing is challenging to operate. There are at least four different intermittent fixture types (Jamak, Jones-Odem, Wallace and Wykeham-Farrance) and one continuous compressive stress relaxation, CCSR fixture (Elastocon). Complicating this are four different sample geometry types and the potential use of aeration. The focus of this paper is to address these issues and offer some comparisons of the new ACM (polyacrylate) polymers that have been developed for the increasing temperature requirements in an engine compartment.
Technical Paper

Evaluation of New ACM Polymers in Sealing Applications Using Advances in Compressive Stress Relaxation Test Measurements: Part 2

2004-03-08
2004-01-0871
Compressive Stress Relaxation (CSR) testing is challenging due to the different sample geometries, fixtures, aeration, and temperature cycles. Ageing environments such as hot air, static fluids, and aerated fluids contribute significantly to this challenge. ASTM and Original Equipment Manufacturer (OEM) standards allow a fixture two hours to equilibrate after immersion in ageing medium before testing. Experience has shown that the sample may not be at room temperature thus leading to possible errors in force readings. The focus of this paper is to conduct thermal cycle testing on typical rubber gasket compounds in order to determine their properties in such environments. Various thermal cycling methods were performed in order to determine the influence on the compound properties.
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