Gasket material (ANSI B16.47 #150 flange)

[Mboundi]

Hi,
what is the material to be used for the sheet gasket of a #150 28" flange (ANSI B16.47 Series A)? What is the reference standard for the gasket material?

 

[JLSeagull]

What is the fluid; and at what pressure and temperature? Determine the gasket material compatibility with the fluid.

 

[Mboundi]

Fluid is sea water without overpressure (1 bar).
I know that there are a lot of materials suitable for the same application. But i don't know what is the best choice and the relative standard (if any).