Stoppers
Stoppers, also known as bungs, are used to give an airtight seal to laboratory flasks and test tubes by fitting tightly inside the neck of the container and preventing material from spilling. Stoppers can be made of glass, cork, rubber, or silicone. They are typically designed with a conical shape, but straight, flanged, and tapered options are also available.
Stoppers are the preferred choice for many applications requiring a tighter seal or a greater degree of chemical resistance. They also provide a good seal when a solution needs to be shaken or mixed without spilling. Stoppers are generally cylindrical in shape and have a tapered bottom end. They may be marked with a stopper number or size on the top and bottom diameters of the stopper. Sizing can vary among manufacturers.
Stoppers are available in a solid design or with holes known as positions placed in the top. Positions allow easy access to the material contained in the sealed vessel by pipettes, tubing, or other equipment without full removal of the stopper.
What Types of Stoppers Are Available?
• Turnover stoppers have external serrations to create an excellent internal seal combined with a flexible turnover sleeve that folds down over the container’s neck to create a double seal
• Serum bottle or vial stoppers have two or three legs with external serrations or straight sides and a flanged top to create an airtight seal
• Straight bromobutyl plug-type stoppers provide a maximum seal for vials and serum bottles with a straight-wall glass finish
• Ultra-pure, straight bromobutyl plug-type stoppers provide high chemical purity and low gas permeability. They offer excellent performance during freeze drying processes such as lyophilization, where stoppers must remain stable during transfer and sublimination phases
• Silicone recessed septa stoppers are non-toxic and have external serrations to create an effective internal seal
Chemglass Life Sciences Stopper, Polyethylene, 19/22
Stopper, Polyethylene, 19/22. Inexpensive, tapered stopper provides for a tight, leak-proof fit while the top ring permits the stopper to be easily removed. Stoppers are made of yellow Polyethylene. SOLD 100/PKG.
SCP Science PLUG STOPPER, 17MM PK/1000
This item has a minimum order quantity of 2 per supplier requirements. PLUG STOPPER, 17MM PK/1000
West Pharmaceutical Services Inc 20MM SERUM NOVAPURE RP S10-F45
20mm Serum NovaPure RP S10-F451 4432/50G
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 14/20-14/35 Outer Joints, White
Septum Stopper, Sleeve Type, For 14/20-14/35 Outer Joints, White. Sleeve type stoppers with a hollow plugs and sleeve extensions that folds down over the neck of a vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn.
Ace Glass, Inc. Septa, red rubber, sized for 24/40 joints, pk/72
Septa, red rubber, sized for 24/40 joints, pk/72
Chemglass Life Sciences 24/40 Stopper, Hollow
24/40 Stopper, Hollow. PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the glass outer joint. The 14/20 and 19/22 are solid, while the larger sizes are hollow.
Chemglass Life Sciences Stopper, PTFE, Hollow, 14/20
Stopper, PTFE, Hollow, 14/20. Hollow PTFE stopper.
Accuflow Systems Saint-Gobain Silicone Stopper, 0.315 x 0.473 x 0.788 in, 10/Pack
Saint-Gobain Sani-Tech silicone stoppers are ultra-pure, platinum-cured silicone closures engineered for laboratory and bioprocess use. They provide reliable sealing, high chemical resistance, and compatibility with common sterilization methods to minimize particulate generation and contamination risk.
- Material: Ultra-pure platinum-cured silicone.
- Dimensions: 0.315 x 0.473 x 0.788 in (8.0 x 12.0 x 20.0 mm).
- Pack quantity: 10 pieces per pack.
- Temperature range: -94° to 482°F (-70° to 250°C).
- Sterilization: Autoclavable, radiation up to 2.5 Mrad (25 kGy), ethylene oxide compatible.
- Applications: Biology, hematology, microbiology, biopharmaceutical assays and processes.
- Compliance: Meets FDA/BGA standards for laboratory closure components.
Chemglass Life Sciences Stopper, PTFE, Hollow, 24/40
Stopper, PTFE, Hollow, 24/40. Hollow PTFE stopper.
Chemglass Life Sciences Syringe, Polypropylene, Luer Lock, 20mL, Non-Sterile, Bulk
These all polypropylene syringes are latex-free and contain no rubber or silicone. The plastic plunger has a smooth draw and a positive safety stop to prevent accidental spills.