Obtaining Elastomer Shelf Life
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“Shelf life” is the maximum time (beginning with manufacture date) that an o-ring or elastomeric seal – with proper packaging and storage, becomes unable to meet its original specifications.
Aerospace Recommended Practice (AP 5316) is the most comprehensive basis for establishing shelf life, however, it is not a binding specification.
Let’s look at a few Methods at which shelf life is being calculated.
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5 Methods to Obtain Elastomer Shelf Life
Some materials are listed as unlimited, however unlimited is not equal to forever. For some companies, they use 25 to 30 years as unlimited shelf life. According to the study EPRI NP-6608, which is one of the references in ARP 5316, which replaced by Aerospace Standard 5316, in the study it talks about five different methods to obtain elastomer shelf-life.
1. Method A: MANUFACTURERS RECOMMENDATION
2. Method B: NATURAL AGING
3. Method C: ARRHENIUS CALCULATION
4. Method D: ACCELERATED AGING