This was another question, I think they are freaking hard: A gas tank float (Texaco gasoline) of 1.000 +/- 0.050 inch in diameter, must operate for five years with this tolerance at an average temperature of 73 F. The float must operate between -40 F to 120 F . Assume the post mold shrinkage
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http://cr4.globalspec.com/thread/14372/Plastics-engineering-III?from_rss=1
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