1. Stretch greater than 5% on the O-ring I.D. isn’t recommended because it can lead to a loss of seal compression.
2. Know the difference between Groove and Gland depth. Groove is the machined depth into the one surface. Gland is the groove depth plus diametrical clearance, used to calculate seal compression
3. If you want seal compression, groove depth must be less than the seal cross section. To compensate for this compression, the groove width must be larger than the seal cross section.
4. Static applications are more tolerant of material and design limitations than dynamic applications.
5. Make sure the maximum volume of the O-ring never surpasses the minimum volume of the gland.
6. Passing O-rings over ports is not recommended for reciprocating seals — nibbling and premature wear and seal failure will occur!
For more information, visit the Apple Rubber Products’ social media page.
Kevin Oberholzer, Project Engineer
Apple Rubber Products