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These septa are PTFE resistant until punctured, then the septa will be silicone compatible with PTFE/silicone septa, resist core, and provide great resealability.
Caps with PTFE/red rubber septa are an economical option, PTFE facing facing provides a good barrier from product contact.
Cat Number: STEM-L-3857-LGZ
Application: For Chromatography Vials.
Model: 256430