cem3 copper clad laminates

pengzhou dzdavid(at)sina.com pengzhou CEM3 The family of laminates under the name CEM-3 by the NEMA (National Electrical Manufacturers Association, USA) classification. Composite material based on glass-epoxy compounds, usually has a milky white color. Very widely used in the production of double-sided PCBs with plated holes. The properties are very similar to that of FR-4, except the lower mechanical endurance. CEM-3 is a cheaper alternative to FR-4 for most applications. Laminates have a good ability to mechanical processing (milling, punching). Flammability rating is UL94-V0. Depending on the properties and applications, CEM-3 laminates are divided into the following subclasses: standard, with UV blocking or without it. with a higher Tg , compatible with the lead free reflow technology; halogen-free, without phosphorus and antimony, non-toxic;