SS Scientific offer a full range of OFHC Copper, annealed copper, aluminium, gold, silver plated and elastomeric fluorocarbon gaskets for CF flanges.
Metal gaskets are impermeable to gases and withstand moderately high temperatures indefinitely and the CF flange is the most widely used for high vacuum and UHV applications with many gauges, instruments, accessories and feedthroughs available on this flange system.
CF Gasket Materials:
Copper, The normal gaskets for stainless steel CF flanges are punched from 1/4-hard, high purity, oxygen-free (OFHC) copper stock, chemically cleaned and finished to be scratch and burr-free.
Silver & Gold plated Copper, Are for systems requiring frequent high-temperature bake outs, silver or gold plated copper gaskets are recommended.
Aluminium (1100-H14), Aluminium CF flanges must use aluminium gaskets and never copper.
However, aluminium gaskets can be used on stainless steel CF flanges if baking is restricted to 200° C.
Fluorocarbon, Fluorocarbon gaskets, with a flat cross-section, are convenient and reusable in non-critical, non-UHV applications, particularly in applications requiring frequent reassembly.
Nickel, Nickel gaskets are typically used in applications with a corrosive environment.