Measurement and Control of Coating Thickness and Porosity in Printed Wiring Manufacture Available to Purchase

Most of the basic requirements for the manufacture of printed wiring are, of course, well known; so much so that literally hundreds of companies or divisions of larger companies are formed annually to produce these products. However, a high percentage of such companies fail, especially when new specifications are introduced or existing specifications are adhered to by the purchasing authority. There is a wide diversity of reasons for failure of printed wiring products to meet the requirements of quality and performance. Since some of these can be attributed to coating thickness and/or coating porosity, it is therefore the purpose of this article to outline the ways and means to control these parameters.