Ranking of rubber vulcanizates used as seals based on effect of accelerated aging

✍ Scribed by V. Subrahmanian; S. Ganapathy

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 482 KB
• Volume: 78
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/1097-4628(20001227)78:14<2500::aid-app100>3.0.co;2-9

✦ Synopsis

Technical properties such as hardness, tensile strength, ultimate elongation, and rebound resilience are popular in quality control, but the trend in these properties shows a generalized picture of the structure-property relations. Test specimens were aged in hot air by systematically varying the time and temperature from 24 to 96 h at 70 to 100°C. For an effective comparison the observed values were plotted as a function of time, temperature, and formulations. The data thus obtained were correlated with shelf-aging in particular cases, and it was observed that aging at 100°C for 24 h could be used for such formulations. A "sulfur donor" system cured nitrilebutadiene rubber (NBR) vulcanizate and an ethylene-propylene-diene (EPDM) vulcanizate showed the best retention of properties. Although the SEM micrograph of the NBR was in agreement with this observation, the EPDM was not.