Made of polypropylene

These ScrewCap closures are equipped with a silicone washer to ensure a positive leakproof seal at all temperatures. Because both ScrewCap closures and tubes (listed below) are both manufactured of polypropylene, have the same coefficient of expansion (Note: maximum volumes for tubes are recommended for different temperatures, inquire for information). The ScrewCap features a long skirt and a superfast thread design allowing it to be removed or screwed on with a single turn.

Autoclavable.

THESE SILICONE WASHER SCREWCAPS WILL GUARANTEE A POSITIVE LEAKPROOF SEAL AT ALL TEMPERATURES.

Use these ScrewCaps with Sample Tubes, sold separately: #TB3741-10 #TB3742-18, #TB3744-36, #TB3745-36, #TB3746-45.

Specify Color of ScrewCap closure.

Note: Picture shows both ScrewCaps available (with and without silicone washer).