5mm Teflon Sample Tube Caps
Made of PTFE, these caps are the most inert 5mm tube cap. The precision machined cylindrical design maintains good spinning quality. A snug push fit ensures solvent retention, and a circular external groove aids in removal. The easiest way to remove the cap is to grasp under the cap with your finger nails and pull straight up and off. Clean and reuse.
Application Note:
In experiments where D2O solutions are heated to 90°C to speed up reaction times, the standard 5mm tube cap will “pop” off the tube. It is also difficult to secure it squarely to the tube. Alternatively, use of a 5mm Teflon cap and a few turns of parafilm form a secure, symmetrical closure that stays in place. When finished, cut the parafilm off and salvage the cap for reuse. Individual performance will vary with solvent and temperature parameters.
