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#8 Acidic conditions: both are more <br />aggressive to some polymers <br />ASTM spec for biodiesel 0.5 max* total acid number, <br />... acidic conditions exceeding this spec can increase swelling <br />are a byproduct of iodiesel oxidation <br />... for example, here's the of <br />B20 at 3 acid levels on <br />VITONO Fluoroelastomer A401 C over 1000 hours: <br />CUPA <br />