Pinch to 355 mesh/inch.
Polyester filter mesh and nylon filter mesh are extensively used for filtration in aviation,airspace and petrochemical industries and polyester filter cloth with black color is specially used for dustproof on the electronic speakers such as monile phone and other various speakers.
http://www.bjpfmscreen.comFM can supply polyester filter mesh(polyester filter cloth) from 20 mesh/inch to 460 mesh/inch and nylon filter mesh(nylon filter cloth) from 13mesh/