Rubber Stopper, #5-1/2

These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%).

Autoclavable at 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.