Synthetic RedRubber/PTFE material as a cost-effective match of the Instrument Manufacturer Quality. In contrast to Natural Rubber it is not suitable for multiple injections, however softer for a safe penetration. Screw cap with the design of a crimp cap, therefore suitable for robotic handling. Already assembled seal with slitted liner available, in order to avoid vacuum within the vial in case of multiple injections. With pre-cut septa only the silicone material is slitted in Y-shape while the PTFE lamination remains intact. This way concentration changes occuring with completely slitted septa can be avoided. Short thread seals also available as closed top version (blue cap).This product is an alternative to the products (SKU) of these brands: Agilent:- Waters:- Chromacol: 9-SCJ-ST15 / 500 (alt.)9-SCJ-ST101 / 500 (alt.) - National Scientific: C4000-54A / 100 - Wheaton: W225332-0201 W225334A-0401 - Finneran: 5395-095395-09F - SUN/SRI International: 503 790 / 100 Labhut Cronus: VCA-0904TB-100