How thick shoul trafaret plate be? I thought

How thick shoul trafaret plate be? I thought that propriate thicknes would be equal to diameter of holes. In this case (ICH4,5...) thicknes is abot 0.76mm? Am I right or U sugesting that it sould be thicker (about 1mm)? I`m litle worry becouse of plate is deforming on high temperatures (350-400 degrees).
You think that I leave 0.76mm holes for ICH 4,5 trafaret?