Caps, Screw Top, Solid, with an ultra-pure, Silicone Rubber / PTFE liner, in a closed Black Cap. For use with 9-425mm thread,12x32mm autosampler vials. AQR Brand 100/PK.

Ultra-pure liner, No color dyes added to the Rubber or PTFE. Good choice for storage when inertness and a good seal is required. Silicone rubber is not colored.

Turns 12x32mm, 2ml autosampler vials into storage bottles.