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, 24/25 and 24/40
Stopper, Polyethylene, 24/25 and 24/40. 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.
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.
Chemglass Life Sciences Stopper, Polyethylene, 14/20
Stopper, Polyethylene, 14/20. 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.
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.
Accuflow Systems Saint-Gobain Versilic Stopper, Platinum-Cured, 12.5 x 16.5 x 20 mm
Saint-Gobain Versilic silicone stoppers are platinum-cured closures designed for laboratory and bioprocess applications. This configuration measures 12.5 mm top diameter, 16.5 mm bottom diameter, and 20 mm height, and is supplied 10 per pack.
- Platinum-cured silicone provides high purity and broad chemical compatibility.
- Dimensions: top 12.5 mm x bottom 16.5 mm x height 20 mm (0.493 x 0.650 x 0.788 in).
- Supplied 10 per pack for small-batch use and inventory control.
- Intended for closure systems in single-use assemblies and laboratory glassware.
- Datasheet and material compliance information available from the manufacturer.
Petroleum Analyzer Corporation Kit, sensor, dry point, stopper, vapor probe, 200 ml
Kit, sensor, dry point, stopper, vapor probe, 200 ml
Chemglass Life Sciences Septum Stopper, Sleeve Type, for 8mm OD Standard Wall or 9mm OD Medium Wall, Red
Septum Stopper, Sleeve Type, for 8mm OD Standard Wall or 9mm OD Medium Wall, Red. 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.
Chemglass Life Sciences Stopper #32, Pennyhead, Flask Length, Solid
#13 Low Actinic Red Stained Glass Stopper. Flask length solid penny head stopper with low actinic red stain.
Cayman Chemical 384-Well Solid Plate (low volume; black), 1 ea
384-Well Solid Plate (low volume; black), 1 ea
Cayman Chemical 384-Well Solid Plate (low volume; black), 5 ea
384-Well Solid Plate (low volume; black), 5 ea
Cayman Chemical 96-Well Solid Plate (black), 1 ea
An uncoated flat-bottom 96 well plate for use in fluorescence or chemiluminescent assays.