Translucent silicone stoppers are especially suited for procedures demanding high purity, such as tissue culture work and food science applications. Food-grade quality stoppers are nontoxic, chemically inert, and resist Particle buildup. Withstand repeated sterilization, as well as temperatures from -76 to 392°f (-60 to 200°c). peak at 428°f (220°c). European size (DIN no.) is noted on stopper. compliant. Autoclavable.