o-ring design

[STVV]

Hello,
I would like to know if the design formulas for O-ring design parameters such as the glad dimensions, squeeze, extrusion gap, etc. vary greatly for pressure above 1500 psi. I have a joint that could see 3000psi. Also what are the benefits of a contoured backing ring verses a flat one. This joint is static with a face seal and maybe another male gland seal.

Thanks

 

[flexibox]

there is loads of information on Oring groove designs on the net here is one link that may assist. scroll down to pressure vs clearnce and trust this helps.

http://www.marcorubber.com/gd-directory.htm