9mm Blue Screw Cap with PTFE/Rubber Liner, Closed Top, 100-pk

These 9mm blue screw caps with closed top design provide reliable sealing for autosampler vials in HPLC, GC, and general chromatography applications. The PTFE/Rubber composite liner delivers excellent chemical resistance on the sample-contact side while the rubber backing ensures a secure, leak-proof seal, making these caps ideal for volatile sample storage and automated analysis workflows.

• 9mm thread size compatible with standard short-thread autosampler vials
• Closed top design prevents contamination and minimizes evaporation
• PTFE/Rubber liner offers chemical inertness with flexible sealing properties
• Blue polypropylene cap for easy sample identification
• Convenient 100-pack quantity for routine laboratory use
• SKU: 4000-99B