Silicone rubber stoppers are premium, highly inert laboratory and industrial bungs made from a flexible, high-purity synthetic silicone elastomer. Engineered for demanding medical, chemical, and manufacturing environments, these tapered plugs provide a clean, airtight compression seal that will not contaminate the fluids or gasses inside a container. Silicone rubber stoppers are known for their exceptional thermal stability, outstanding resistance to environmental degradation, and long-lasting elasticity under repeated sterilization cycles.

Laboratory glassware sealing, food and beverage processing, pharmaceutical and medical research, chemical containment, autoclave and steam sterilization procedures, high-temperature masking, vacuum environment sealing, and cleanroom applications.

Concentrated mineral acids (like sulfuric or nitric acid), highly volatile organic solvents, petroleum-based oils and fuels, high-pressure dynamic mechanical seals, and continuous exposure to high-pressure steam over extended periods.

Silicone Rubber Stopper Limitations

• Susceptible to degradation and swelling if left in contact with concentrated aromatic hydrocarbons or fuels.
• Lower tear strength compared to natural rubber, making them prone to puncturing or tearing if forced onto sharp glass or metal burrs.
• Prone to gas permeation, showing higher gas transmission rates than heavy-duty butyl or nitrile rubbers.

-85 to 450°F (-65 to 232°C)

Silicone Bungs, High-Temp Lab Plugs, Translucent Lab Stoppers, Pure Silicone Plugs, Food-Grade Tapered Stoppers.