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
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #11, 6 per Pack
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available in green neoprene rubber that is resistant to chemicals and ozone deterioration or standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
Chemglass Life Sciences Stopper, Safe-Lab, Flask Length, PTFE, Size 16
Stopper, Safe-Lab, Flask Length, PTFE, Size 16. Flask length PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the flask. All sizes are solid.
Cole-Parmer Twistit white rubber stopper, size 6
Use these versatile Twistit stoppers as either a solid, one-hole, two-hole, or three-hole stopper. Simply twist off a bottom seal to open a hole. The soft resilient natural rubber stays pliable over a long period and withstands laboratory conditions without hardening. Stoppers retain resiliency even after repeated autoclaving. Each stopper has its size in raised figures on top. Available in black or white rubber. Autoclavable.
Ace Glass, Inc. 45/50 PTFE Stopper with Polypropylene Extraction Nut, Solid
45/50 standard taper PTFE stopper with polypropylene extraction nut for easy removal from outer joints.
Enterprise Technology Solutions PAP-R Products Flat Coin Wrappers, Pennies, 1000/BX, Red
Flat coin wrappers offer convenient storage. The coin type and total amount capacity is printed on the outside of each wrapper for quick calculations. Retrieve coins easily with the pop-open design. Heavy-duty paper wrappers are color-coded to meet Federal Reserve and American Banking Association standards.
Enterprise Technology Solutions PAP-R Products Penny Tubular Coin Wrap, Nested, 1000/BX, Red
Tubular coin wraps for pennies offer increased durability and burst-resistance with two layers of 57 lb. paper. Crimped/pre-formed in the manufacturing process, one end is folded over to keep the wrap's shape. The crimped-end, no-glue wrappers are nested for efficient shipping and storage. Coin wraps are designed to work in all coin-sorting equipment and color-coded to meet ABA standards.
MSC Honeywell Lanyard, BackBiter Twin-Leg, 6 ft, Tie-Back, 1 ea
This shock absorbing lanyard is an all-in-one product featuring a SoftStop shock absorber with a specially-woven inner core that expands to reduce fall arrest forces. It also includes a cross-arm anchorage connector. The lanyard is made of heavy-duty polyester webbing and Cordura nylon webbing.
- SoftStop shock absorber reduces fall arrest forces
- Cross-arm anchorage connector
- Heavy-duty polyester webbing construction
- Cordura nylon webbing for five times more abrasion resistance
- Includes 1 locking snap hook and 2 Miller 5K locking snap hooks
- Provides top-to-bottom tie-back
- Suitable for construction, confined space, roofing, manufacturing, transportation, steel, and metals industries
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 5 x 9 x 20 mm
Versilic silicone stoppers, 5 x 9 x 20 mm, provide a tight laboratory seal for tubes, flasks, and vessels. Molded from silicone, they offer broad chemical compatibility and a wide operating temperature range suitable for routine biological and biopharmaceutical workflows.
- Silicone material
- Dimensions: 5 x 9 x 20 mm (0.197 x 0.355 x 0.788 in)
- Pack quantity: 10 per pack
- Withstands temperatures from -70 °C to 250 °C (-94 °F to 482 °F)
- Suitable for biology, hematology, microbiology, and biopharmaceutical applications
- Meets FDA and BGA standards
Bellco Glass, Inc. KAP-UTS/Blue,16mm
Manufactured from non-toxic autoclavable polypropylene. Ideal for culture tubes and flasks with DeLong style neck and access ports. Same evaporation and sterility characteristics as stainless steel closures. Molded pressure fins for firm grip. There are seven colors and six sizes form 13mm to 38mm. MADE IN THE USA. Case quantity 1000, Color Blue, 16mm
