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, Spherical, Cap Type, Size 28/15
Stopper, Spherical, Cap Type, Size 28/15. Cap style stopper to be used with apparatus having a spherical ball joint. For clamp see CG-150.
WEST PHARMACEUTICAL SERVICES INC 20MM LYO RP1346 4023/50G 500PC
NC2044182 20MM LYO RP1346 4023/50G 500PC
Chemglass Life Sciences Stopper #22, Pennyhead, Flask Length, Solid
Stopper #22, Pennyhead, Flask Length, Solid. All sizes are solid with the exception of the #38 (CG-3018-08) which is hollow.
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 Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing
Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing. Suba-Seal septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along the inner wall of the glass vessel to form an extremely effective air-tight seal. Stoppers are made from natural red rubber and sold in the package quantities listed below.
BRUKER SCIENTIFIC LLC 8mm Vials with stoppers and filling mark, 128 pieces - 10 Pack
This is for 10 packs of vials. Each pack contains 128 pieces. Total vials 1,280.
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 12, Yellow; 1/Bag
Silicone bubbles make these stoppers lightweightthey float on water. Withstand temperatures from 76 to 392>F (60 to 200>C). Stoppers are available in 14 color-coded sizes, given in both standard and Japanese size numbers. Softness and flexibility allow stoppers to fit a range of holes. Easily make openings for glassware fit your exact specifications with the optional cork borer set. 2 bags/case.
Cole-Parmer Solid Black Rubber Stoppers, Standard Size 13.5; 3/Pk
Black rubber stoppers stay pliant over a long period and withstand laboratory conditions without hardening. Stoppers retain resiliency even after repeated autoclaving. Each stopper has its size in raised figures on top. Contain some sulfur. Autoclavable.
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