Alwsci ND13 13mm Screw PTFE/Silicone Cap. High Chemical Resistance: PTFE septa forms an inert barrier between sample and carrier material. 3-Year Warranty: Comprehensive warranty coverage for 3 years on all products. Customized Cap Color: Available in Black, White, or fully customized color options. ISO 9001:2015 Certified: Manufactured under strict quality standards with certified processes. 100% Disposable: Designed for single-use applications to prevent cross-contamination. OEM/ODM Services: Full customization available including logo printing and specific cap sizes. Fast Lead Time: Peak and off-peak season lead times both within 15 workdays. 100,000 Grade Clean Room: Production in a 5,000 SQM clean room ensures high purity and stability.