Maximum temperature 330 deg. C. (Peak temperature of 350 for short periods) BTO is Bleed and Temperature Optimized for the most demanding GC and GC/MS applications. Septa BTO is formulated to extend low-bleed and outstanding mechanical properties or premium GC septa to the highest-temperature applications. 17 mm diameter, 3 mm thick. CenterGuide^TM design requires less force for initial penetration, for a smoother feel. Septum life may be enhanced in some applications by minimizing tearing and coring Packaged in Glass Jar: 2-3/4 in. H x 2-1/4 in. W x 2-1/4 in. D; Weight: 161.9 g *Please note that manufacturer's installation instructions must be followed carefully. Also sticking is more likely in new injection ports and will be less of an issue after the port is conditioned.*