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
Alkali Scientific CellPro™ 24-Well, Silicone Sealing Mats, 50/pk, DNase, RNase & Pyrogen-Free
CellPro™ 24 Well, Silicone Sealing Mats seals 24 wells at a time for minimal evaporation / sample loss, guaranteeing sample integrity, high quality data and uninterrupted workflow. They are useful in PCR, and HTS sample storage and are available in multiple sizes. For a perfect, leakproof seal with most popular plates.
Uline Silicon Rubber For Foot-Operated Extra-Long Impulse Sealer - 30"
Silicon Rubber For Foot-Operated Extra-Long Impulse Sealer-30IN
Ace Glass, Inc. Trap, stopper, vacuum, 55/50, 25mm inner & side tube OD
Trap, stopper, vacuum, 55/50, 25mm inner & side tube OD
Ace Glass, Inc. 250mL gas wash stopper only, porosity B
250mL gas wash stopper with porosity B (70-100micron) fritted disc.
Foxx Life Sciences Borosil® Amber Solid Penny Head Glass Stopper with Interchangeable Ground Joint 34/35, 20/CS
Borosil® Amber Solid Penny Head Glass Stoppers are with Interchangeable Ground Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Manufactured with low extractable quality grade USP Type I, 3.3 Borosilicate Glass confirming to ASTM E438 Class A requirements. Available in sizes of 7/16 to 55/54. Amber blocks 300nm to 500nm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Ace Glass, Inc. 125mL gas wash stopper only, porosity C
125mL gas washing stopper with porosity C (25-50 micron) 25mm fritted disc diameter, and 40/35 joint. Inlet/outlet arms are 8mm O.D.
Chemglass Life Sciences Stopper, Pennyhead, Hollow, 55/50
Stopper, Pennyhead, Hollow, 55/50. Hollow stopper with closed bottom.
Foxx Life Sciences Borosil® Amber Solid Penny Head Glass Stopper with Interchangeable Ground Joint 45/40, 20/CS
Borosil® Amber Solid Penny Head Glass Stoppers are with Interchangeable Ground Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Manufactured with low extractable quality grade USP Type I, 3.3 Borosilicate Glass. Available in sizes of 7/16 to 55/54. Amber blocks 300nm to 500nm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Essendant TREND Terrific Trimmers Solid Colors Board Trim 2 25x39 Assorted Colors 48/Set
TREND Terrific Trimmers Solid Colors Board Trim 2 25x39 Assorted Colors 48/Set