The "English PDF" version of JIS K 6258 details several physical properties that are measured before and after immersion: Mass and Volume Change
To see if the rubber absorbs the liquid (swelling) or if the liquid leaches components out of the rubber (shrinkage). jis k 6258 english pdf
Finally, buried deep within an archived technical directory of a university database, he saw the link. . The "English PDF" version of JIS K 6258
Evaluates degradation localized at the boundary layer where the fluid contacts the component. Evaluates degradation localized at the boundary layer where
Assesses how the mechanical pulling strength and elasticity have been compromised.
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To help find the exact document version or equivalent standard for your testing setup, please share you need or the specific type of rubber you are evaluating.