GETEK is an Epoxy/Polyphenylene blend but is classified as FR-4. The slash sheet that it falls under in IPC-L-108B is 04, this is the same slash sheet as standard FR-4 laminates Hope this helps. Brian R Oatman Tel- 503.357.8695 x 118 Manufacturing/Product Engineer Fax- 503.357.8868 Matsushita Electronic Materials E-mail- [log in to unmask] Forest Grove, OR "If you don't know what you're doing anything is possible."