Metal jacketed gaskets are commonly used in heat exchangers though are often replaced by Maxiprofile style gaskets. Metal
jacketed gaskets can be manufactured with a number of metals and high temperature filers.
Economical
Can be manufactured to suit narrow flanges
Range of materials available
Download the data sheet: https://www.klinger.com.au/wp-content/uploads/2021/05/Metal-Jacketed-Gaskets.pdf