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Silicone Rubber Conical Stopper is made form silicone rubber.

CFDPLAS are a manufacturer of a complete line of rubber stoppers. We mold in most any rubber compound including EPDM, Butyl, Viton, Nitrile. Our standard materials include:
M29 inexpensive Black Natural Rubber/SBR Blend for general purpose uses
M35 Green Neoprene for added chemical resistance
M18 White Natural Gum Rubber for Food Grade applications such as Homebrew Beer and Wine making used with Carboys.
Red Silicone and Clear Silicone for High-Temperature and specialty applications
Listed mainly by trade-size, we make solid, one-hole, and two hole rubber stoppers.
We can also customize with special molded or drilled hole configurations upon request. Uses vary widely, some are outlined below: Carboy Stoppers,Crucible Holders,Laboratory & Test Tube Stoppers,Masking Applications,Micro Stoppers,Pipe Plugs,Tube Stoppers.
Creating a vacuum-tight seal in laboratory apparatuses, the silicone stoppers protect contained solutions and media from being affected by outside elements. The chemically neutral construction is compatible with even abrasive working solvents. With the material also being characteristically resistant to extreme temperatures, the closures will resist cracking when subjected to heating procedures and are autoclavable for reuse. Silicone stoppers have a tapered bottom in various diameter sizes to fit any vessel.

Features:
Autoclavable
Suitable for foodstuff and laboratory tubes,bottles,flasks use.
Materials: silicon rubber
Color:natural or customer made
Size : the upper diameter from 9mm to 60mm, the lower diameter from 6mm to 48mm,
Height: from 18mm to 60mm
Related silicone rubber products: Silicone Rubber Gaskets,Silicone stopper ,Silicone O-ring seals,Silicone tube cap,Silicone grip stopper,Silicone diaphragm of pump valve,Silicone seals