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
Foxx Life Sciences Borosil® Plastic Polypropylene Stopper for Volumetric Flasks with Interchangeable Joint 10/19, 100/CS
Borosil® Plastic Polypropylene Flat Head Stoppers are with Interchangeable Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Polypropylene Available in sizes of 7/16 to 34/35. 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.
Enterprise Technology Solutions 20-Sheet Smarttouch Three-Hole
20-Sheet Smarttouch Three-Hole Punch 9/32 Holes Black/gray
Enterprise Technology Solutions 20-Sheet Ez Squeeze Three-Hole
20-Sheet Ez Squeeze Three-Hole Punch 9/32 Holes Black/silver
Grainger Stopper Sz 8 33 mm BDia Black 0 PK12
The Grainger 16ZD71 is a Westward brand 1/4-inch drive socket set. It includes 17 sockets ranging from 4mm to 14mm in both standard and deep configurations. The sockets are made from chrome vanadium steel and have a matte black phosphate finish. The set comes packaged in a molded case for storage and portability. This socket set is ideal for automotive and machinery applications that require metric sized fasteners. The lifetime warranty provides peace of mind that the sockets are a quality and durable product.
Grainger Stopper Sz 7 30 mm BDia Black 0 PK15
The Grainger 16ZD64 is a 3M Scotch-Brite General Purpose Hand Pad that can be used for cleaning and scouring. It features an open web construction with non-woven fibers that are non-scratching on most surfaces. This 6 inch by 9 inch hand pad has a medium duty abrasiveness level. It can be used wet or dry for scrubbing, wiping and polishing. The 3M Scotch-Brite material resists fraying and tearing.
Grainger Stopper Sz 6 26 mm BDia Black 0 PK20
The Grainger 16ZD56 is a 3M Speedglas Welding Helmet that features auto-darkening technology to protect the eyes and face during welding, cutting and grinding. It has a large viewing area, multiple adjustable settings like shade control and delay, and comfortable padded headgear. The helmet provides shade levels from 5 to 13 for optimal eye protection. It meets industry safety standards. This auto-darkening welding helmet is designed for reliability and durability.
Grainger Stopper Sz 6 26 mm BDia Black 0 PK20
The Grainger 16ZD55 is a 3M Speedglas Welding Helmet that features auto-darkening technology to protect the eyes and face during welding, cutting and grinding. It has a large viewing area, multiple adjustable settings like shade control and sensitivity, and comfortable padded headgear. The helmet provides versatility for different applications with grind mode, weld mode and cut mode. It meets industry safety standards. The Speedglas auto-darkening filter reacts in 1/25,000th of a second.
Grainger Stopper Sz 1 14 mm BDia Black 0 PK65
The product is a 16VA53 transformer by Hammond Manufacturing. It is a single phase transformer with a primary voltage of 120V and secondary voltage of 24V. The transformer has a capacity of 16VA and can output a maximum secondary current of 0.67A. It features an open frame design and measures approximately 2.4" x 2.2" x 2.4". The transformer has an operating temperature range of -20°C to 40°C and is RoHS compliant. It is designed for PCB mounting and low voltage control applications. The product is made in Canada and comes with a 5 year warranty from Hammond Manufacturing.
Grainger Stopper Sz 0 13 mm BDia Black 0 PK40
The 16TW26 is a 16-inch diameter, two-speed, oscillating pedestal fan from Lasko Products. It has 3 speed settings and widespread oscillation for full-room air circulation. The height is adjustable from 42 to 54.5 inches. It has a fused safety plug and is ETL listed. The fan head tilts 90 degrees vertically.
Sigma Aldrich Fine Chemicals Biosciences Precision SealR rubber sep
Engineered for a push on fit in NMR tubes and ampules. The unique design provides a penetration point for cannulation and a dual seal inside the tube and on the outer sleeve. Will not break delicate thin-wall tubing. Manufactured from one certified raw material formulation for absolute consistency in all sizes from lot to lot.Storage Note for Natural Rubber Septa Store septa in a closed bag out of sunlight to retard blooming which is the formation of a whitish film on the surface of the rubber. Blooming is a natural process and does not affect performance. Remove visible bloom by washing or wiping off before use.
