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 0 10 mm BDia Black 0 PK50
The 16TW28 is a 16-inch diameter, two-speed, direct drive exhaust fan from Twin City Fan Companies. It features a welded steel housing with an epoxy powder coat 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 8 standard motor sizes ranging from 1/3 to 7.5 HP. The fan blades are made of aluminum and it can handle temperatures up to 104°F. This exhaust fan is suitable for roof or sidewall mounting.
Grainger Stopper Sz 11 48 mm BDia Black 0 PK7
The Grainger 16VC09 is a 16-ounce aerosol can of CRC Brakleen non-chlorinated brake parts cleaner. It is a fast drying, non-flammable spray that removes oil, grease, brake fluid, and other contaminants from brake linings and drums. It leaves no residue and can be used on metallic and non-metallic brake parts. The aerosol spray reaches hard to access areas.
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).
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.
Waters Corporation Feet, Four per Package
This product consists of four feet per package, designed as spare parts.
- Four feet included per package
- Classified under UNSPSC 41115854
- Product type is spare parts kits
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.
Enterprise Technology Solutions Ettore Products Blades,f/Window Squeegee,Replacement,Rubber,20",144/CT,Black
First-rate rubber blades provide impressive squeegee results for professionals and DIY homeowners alike. Easily clean your windows leaving behind no water streaks. Extensive quality control for each blade ensures consistent, high-caliber performance. 20" rubber replacement blades perfectly fit your favorite Ettore Squeegee head for continued use. Replace rubber blades regularly for best window-cleaning results.
Med Vet International 2.4mm x 38mm 5-Hole Compression Plate, J1074B
Many fractures in feline and small canine patients are too small for the 2.0mm DCP and the 2.7mm CDP is too large.The difference between these plates is enormous compared to the difference between 2.7 and 3.5 CDPs. The AMI (resistance to bending) of the 2.7 CDP is 20 times stiffer than the 2.0 DCP. The AMI of the 2.4 DCP is 10 times that of the 2.0 DCP.The solution is a 2.4 series of plates and screws. The plates in both size and strength are midway between 2.0 and 2.7 DCPs. The range and specifications are shown below. The standard 1.5mm hex screwdriver (used for 1.5 and 2.0 screws) is required. The pilot drill is 1.8mm and dedicated instrumentation such as load/neutral guides are also available.