... manufacturer for steel mesh filter which are used on Smoke detectors filter mesh for Smoke detectors All the micro filter meshes are chemical etched ... , Smallest hole diameter can be 0.1 mm when the material thickness is below 0.05 mm, filter hole ... , square, Hexagon or customized.Generally, the thickness of mesh is 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm or 0.3 mm