Suba-Seal^™ silicone rubber septa 

Translucent silicone rubber septa:
• Contain no pigments, waxes, or molding agents
• Good for high heat applications (200 °C continuous or 400 °C intermittent)
• Autoclavable for sterile uses
• Excellent resistance to deterioration due to sunlight and ozone
Turnover flange grips outside of container neck, promoting a double seal in conjunction with annular serrations on hollow plug. Annular serrations depress themselves against the inside wall of the bottle neck, making each serration a suction sealing point.

Suba-Seal is a trademark of Sigma-Aldrich Biotechnology LP and Sigma-Aldrich Co.