Black rubber stoppers are a specially selected grade. A high percentage of pure rubber is present. Will withstand the most trying laboratory conditions without hardening. Resiliency and pliability over a long period are assured by the composition. Low in free sulphur. Number of stoppers per pound is higher than for those containing high-weight fillers.

Assorted Rubber Stoppers
Solid stopper assortment (66 pieces) is for use especially in the small laboratory where a large number of any one size is not needed (sizes 00 to 8).