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 45/50 PTFE Stopper, 3/4" NPT, Complete with Extraction Nut
45/50 PTFE Stopper, 3/4" NPT, Complete with Extraction Nut. PTFE stopper adapter is similar to CG-3002-L but with the addition of one female NPT port in the center. The optional PTFE compression fittings provide a convenient way to insert probes or connect PFA tubing or FEP tubing to reactors or flasks. PTFE stopper has an extraction nut permitting easy removal of the stopper from the glass outer joint.
Chemglass Life Sciences Rubber Stopper, #13, Two Holes, Black
Rubber Stopper, #13, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (68mm), Bottom (58mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #9, Two Holes, Black
Rubber Stopper, #9, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (45mm), Bottom (37mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Solid Rubber Stopper, #3, Black
Solid Rubber Stopper, #3, Black. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (24mm), Bottom (18mm). Length: (25mm).
Chemglass Life Sciences Rubber Stopper, #0, Two Holes, Black
Rubber Stopper, #0, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (17mm), Bottom (13mm). Length: (25mm). Diameter of holes: (3mm).
Chemglass Life Sciences Solid Rubber Stopper, #10-1/2, Black
Solid Rubber Stopper, #10-1/2, Black. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (53mm), Bottom (45mm). Length: (25mm).
Chemglass Life Sciences Foam Plug, fits 14-20mm Openings
Foam Plug, fits 14-20mm Openings. Identi-Plugs are for use with test tubes and flasks. They are reusable and leave no clinging fibers like cotton plugs. They provide a snug fit, yet permit free air flow. Plugs are ideal for use with Drosophila vials. They spring back to original shape after repeated use. Identi-Plugs can also be used as a cleaner for lab pipettes, tubes, vials, as well as industrial precision tubing. Plugs are approximately 1.75" long.
Electron Microscopy Sciences Vacule Red Stoppers
Heavy wall construction, designed for lyophilization and freeze-drying. Manufactured from Wheaton 33 low extractable borosilicate glass (meets ASTM Type I Class and USP Type I Standards). Accessory for 4 ml Vacule Vials.
Electron Microscopy Sciences Vacule Caps-Solid Top, No Liner
Heavy wall construction, designed for lyophilization and freeze-drying. Manufactured from Wheaton 33 low extractable borosilicate glass (meets ASTM Type I Class and USP Type I Standards). Accessory for 5 and 10 ml Vacule Vials.
Chemglass Life Sciences Foam Plug, fits 46-65mm Openings, 3.5" Long
Foam Plug, fits 46-65mm Openings, 3.5" Long. Identi-Plugs are for use with test tubes and flasks. They are reusable and leave no clinging fibers like cotton plugs. They provide a snug fit, yet permit free air flow. Plugs are ideal for use with Drosophila vials. They spring back to original shape after repeated use. Identi-Plugs can also be used as a cleaner for lab pipettes, tubes, vials, as well as industrial precision tubing.
Enterprise Technology Solutions Sparco Coin Wrapper, 60 lb., Pennies, .50, 1000/PK, Red
Coin Wrappers are folded flat, yet pop open at a squeeze. Made of 60 lb. kraft stock. Precision manufacturing to absolute sizing ensures perfect fit in coin machine stems. Colors conform to ABA 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.
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.
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
Chemglass Life Sciences Replacement Luer Stopper
Replacement Luer Stopper. Replacement luer stopper for CG-1158 caps.