Why make filter screen out of several different materials when one will do for most applications 316 stainless fits that bill. It's relatively easily woven in many different mesh sizes. The individual fibers are strong and will retain its shape as a screen well when shaped. 316 stainless is highly corrosion resistant. At -50°C other materials used for screens may be come brittle and break a part.
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Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"