4350B/4003C from Rogers 25N/25FR of Arlon Taconic’s TLG series is a brittle sheet similar to epoxy resin/glass woven cloth, with reduced drill tip and routing knife life. The processing steps include cutting, drilling, hole treatment, PTH copper sink, solder mask, and routing, with the importance of careful handling and burr removal. Sulfur-free paper is recommended for the separation process.