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
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 2 16 mm BDia Black 0 PK25
The Grainger Approved 2-1H Stopper Sz 2, 16 mm BDia, Black 0 PK25 is a rubber stopper made of black butyl rubber. It has an outer diameter of 16 mm, an inner diameter of 6 mm, and a length of 16 mm. This stopper is designed to provide a tight seal and fit snugly into containers. It comes in a pack of 25 stoppers. The stoppers are rated to withstand temperatures between -65 to 250°F. This product can be used to plug bottles, vials, tubes and other containers in laboratory, industrial, and chemical processing applications. The black color provides contrast for easy visual inspection.
Grainger Stopper Sz 0 10 mm BDia Black 0 PK100
The 16TW27 is a 16-inch diameter, two-speed, direct drive exhaust fan from Twin City Fan Companies. It features a welded steel housing with an enamel finish and is designed for general ventilation and exhaust applications. This belt drive exhaust fan has a maximum airflow of 8,050 CFM and is available in 115V or 208-230V models. The motor is totally enclosed air over (TEAO) cooled with sealed ball bearings and automatic reset thermal overload protection.
Med Vet International Jorvet Rubber Valve, for Ferromatic Syringe, J0053FD12
Replacement Rubber Valve, for Jorvet Ferromatic Syringe
Chemglass Life Sciences M27 Blind Stopper for Bioreactor Head Plate (Chemglass CLS-1385-14)
The M27 Blind Stopper is a threaded blind plug designed to close unused M27 threaded ports on bioreactor head plates. It provides a corrosion-resistant closure for unused openings and is suitable as a replacement component in laboratory bioreactor assemblies.
- Constructed from 316L stainless steel.
- Electropolished surface finish of 20Ra or better.
- Threads into M27 ports from the outside to close unused openings.
- Designed for use with bioreactor head plates and assemblies.
- Compatible with common bioreactor systems; replacement silicone o-ring available.
Chemglass Life Sciences Rubber Stopper, #1, One Hole, Black
Rubber Stopper, #1, One Hole, 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 (19mm), Bottom (14mm). Length: (25mm). Diameter of hole: (4mm).
Chemglass Life Sciences Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing
Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing. Suba-Seal septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along the inner wall of the glass vessel to form an extremely effective air-tight seal. Stoppers are made from natural red rubber and sold in the package quantities listed below.
Chemglass Life Sciences Rubber Stopper, #9-1/2, Two Holes, Black
Rubber Stopper, #9-1/2, 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 (46mm), Bottom (38mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #15, Two Holes, Black
Rubber Stopper, #15, 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 (103mm), Bottom (83mm). Length: (39mm). Diameter of holes: (5mm).
Ace Glass, Inc. Septa, red rubber, sized for 8mm OD tubing, sp/12
Septa, red rubber, sized for 8mm OD tubing, sp/12
Ace Glass, Inc. Pk6 50mm 10 microliter, 26 gauge, 20° bevel removable needle syringe.
Pk6 50mm 10 microliter, 26 gauge, 20° bevel removable needle syringe.
Ace Glass, Inc. Septa, white rubber, sized for 14/20 joints, sp/12
Septa, white rubber, sized for 14/20 joints, sp/12