Negative Working 40μm Thick Laminating High resolution Dry Film Photo resist suitable for Printed Circuit Board production and Chemical Metal Etching Milling applications. The standard listed Dry Films are suitable for a wide range of Non-Ferrous Metal Types (ie Copper, Brass etc) and Ferrous Metal Types (Steel etc) . However if etching deeper than 0.4mm of Ferrous metals is required please order the Ferrous version of the dry film.