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Page 4 of 7 Lower squeeze than that shown in Table A2 will reduce friction, at a cost of possible leakage in low pressure situations. Greater squeeze than that shown will increase friction and sealing capability, at a cost of difficult assembly, faster seal wear, and the increased potential for spiral failure. StretchWhen the I.D. of an O-ring is stretched, the O-ring's cross section is reduced. In such instances, be sure to consider that the O-ring's reduced cross section maintains the correct percentage of seal squeeze. The percentage of stretch should not exceed 5% in most applications (Stretch Formula) ROTARY SEALSAs shown in Illustration 4.7, O-rings may be used as seals for rotating shafts, with the turning shaft protruding through the ID of the O-ring. 
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