What are the advantages & disadvantages of metal seals and elastomer (o-ring) seals?
Metal seals can achieve higher vacuum and higher bake out temperatures, though they are single-use items. Metal seals are usually designed for semi-permanent installation where the seal is not frequently replaced. Elastomer seals are replaceable and can be used in dynamic sealing environments where the seal must be opened and closed on a regular basis. There are many types of elastomer compounds to accommodate many different processes.