Specification checklist
Engineers specifying seals will get better results if they define requirements and take them to a reputable, custom-seal fabricator early in the design process. Most fabricators are happy to provide technical assistance. And some have wide experience across several industries, so they can offer a wider palette.

Here are the key application elements that should be defined at the outset.
What are you sealing against? Air? Water? Gas? Something else?
Pressure differential across seal
Service-temperature range
Other environmental factors (UV, particulates, ozone)
Duty cycle: Frequency of inflation, Duration of inflation
Applicable codes and standards
Direction of expansion: radial inward, radial outward or face and axial.
Inflated height
Overall dimensions for active length
Corner radii (if applicable)
Maximum allowable deflated profile