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
JDM LAB SOLUTIONS LLC MicronPlus SILICONE PATCH SILICONE 20 MIL
MicronPlus Silicone Patch,Silicone 20 mil,Color Adhesive,36 patches per strip.
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.
West Pharmaceutical Services Inc 20MM NOVAPURE LYO STOPRS 2K/PK
NC3812723 20MM NOVAPURE LYO STOPRS 2K/PK
Hach Company Stopper, Rubber, One Hole, Size 8, 1/pk
#8 Black SBR stopper, complete with one 7/8 inch diameter drilled center hole. 1/pk.
Chemglass Life Sciences Replacement 1/8" Stopper
Stopper, Replacement , 1/8" for CG-1158 Series Caps
Chemglass Life Sciences 29/42 PTFE Hollow Stopper, 1/4" NPT, Complete with Extraction Nut
29/42 PTFE Hollow Stopper, 1/4" NPT, Complete with Extraction Nut. PTFE stopper is similar to CG-3002-L but with the addition of one female NPT port in the center for connection of compression fittings or pressure/vacuum gauges. PTFE stopper has an extraction nut permitting easy removal of the stopper from the glass outer joint.
Chemglass Life Sciences Rubber Stopper, #12, One Hole, Black
Rubber Stopper, #12, One Hole, Black, 3/PK