Caps, Screw Top, with Red PTFE / White Silicone Rubber / Red PTFE Septa, fitted in "knurled", polypropylene, Blue Caps. For use with 9-425mm thread, 12x32mm autosampler vials. MICROSOLV Brand. 1000/CS
Additional Info:
The 9502S‑20C‑B‑M screw caps utilize a specialty, multi‑layer septa construction developed specifically for legacy autosampler platforms, including older systems such as the Agilent® 1050, where enhanced mechanical needle interaction is beneficial.
This septa design places red PTFE layers on both the needle‑contact and sample‑facing surfaces, with a white silicone rubber core. The exterior PTFE surfaces provide additional needle wiping during penetration, helping remove residues from the needle exterior as it enters the vial. This can reduce carryover in methods where autosampler cleaning capabilities are limited by older instrument designs.
Compared to standard silicone rubber / PTFE septa, this configuration also offers a modest improvement in resealing performance after injection, supporting better vial integrity during repeat injections or extended sequences on legacy systems.
The knurled polypropylene caps provide secure handling and consistent sealing, while the fitted septa design delivers reliable performance in applications where bonded septa are not required due to lower injection forces.
This 1000‑count case format is ideal for laboratories maintaining older autosampler platforms or validated legacy methods that benefit from enhanced needle wiping and improved resealing behavior.