[PSUBS-MAILIST] O-ring Question

[Alan James via Personal_Submersibles]

 Hi,am having trouble Googling an answer to this question.   I have an O-ring groove in the bore of my light housing, sealingbetween the bore & the side of my acrylic lens as per attached diagram.On a piston O-ring groove it calls for an optimal 2% stretch & not more than 5%.I can't find any reference to what stretch if any should be, if any, for an o-ringin a bore groove. I did see that in a rotary application they don't advice thattheir should be any pressure on the rotating rod.Should I be designing so that the o-ring will have a 2% stretch around the lens?Thanks, Alan
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