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 Only, 250mL Gas Washing Bottle, Coarse Frit
Stopper Only, 250mL Gas Washing Bottle, Coarse Frit. Replacement stopper for CG-1114-14.
Chemglass Life Sciences Nylon Loosening Nut, 45/50, 25.4mm & 30mm
Nylon Loosening Nut, 45/50, 25.4mm & 30mm. Replacement part for CG2077H series of PTFE stirrer bearings.
AVANTOR MASTERFLEX (VWR LLC) TUBNG CHEMBIO 2 STP 13 25FT 8P
Masterflex L/S 2-Stop Precision Pump Tubing, Chem-Durance Bio, L/S 13; 8/PK, Avantor
Chemglass Life Sciences Silicone Plug Stoppers, 9mm
Microcarrier spinner flasks promote optimal growth of suspension and microcarrier cultures. Indented bottoms, 100mL thru 1000mL, prevent accumulation of microcarrier beads under the impeller paddle. Please Note: The 6L and 8L Versions Do Not Have Dimpled Bottoms. The complete system includes a flask with two angled sidearms and a PTFE paddle with glass shaft that adjusts trough the compression fitting in the cap.
Grainger K4796 Silicone Round Cord 3/16 D 10 L 70A Blue
The Silicone Round Cord from Grainger is a flexible, durable silicone cord that can withstand temperatures from -100 to 500°F. It has a round cross-section and comes in multiple diameters from 1/16 inch to 3/4 inch. The cord is made from platinum-cured silicone which provides excellent resistance to weathering, aging, moisture, and UV rays. With its high flexibility and temperature resistance, this silicone cord is ideal for a variety of applications including gaskets, seals, hose fabrication, and more. The cord can be cut to desired lengths.
