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#6 Bindip.�P.1`effects may be <br />slow to appear <br />System designers and testing organizations take <br />note... <br />Most significant changes in elastomer physical <br />properties occur within 100 hours of fuel exposure, <br />so test procedures may call for a 100 hour test, but <br />... new data indicate very significant <br />changes occur after > 300 to 1000 hours <br />C U P A <br />