Tortoise Shell Mesh has gotten extensive application in chemical industry,petroleum,power generation,etc.It appears good performance ,it is a hexagonal hole mesh ,with bar steel pressed and punched,three are small holes in every border for interflowing between the holes .The mesh is welded on cyclone dust collector or on the inside wall of the cylinder,poured refractory material.So ,it has prolonged lifetime.The refractory material does not fall off to blockading the discharge hole . material:carbon steel ,1Cr13 ,stainless steel .