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 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.
West Pharmaceutical Services Inc 20MM NOVAPURE STOPPERS 500/BAG
This item has a minimum order quantity of 20 packs per supplier requirements
Grainger Stopper Sz 13 58 mm BDia Black 0 PK5
The 16WC37 is a 16-inch diameter, 3-blade, cast aluminum propeller made by Sensenich Propeller Manufacturing Company. It has a pitch of 37 inches and is designed for experimental aircraft with engines from 65 to 85 horsepower. The propeller is manufactured from heat treated aluminum alloy for strength and durability. It has a standard 1-inch diameter propeller shaft hole and includes all mounting hardware. The 16WC37 provides efficient thrust while minimizing noise and vibration. With proper engine matching, it is an ideal propeller upgrade for many experimental amateur-built aircraft.
Bellco Glass, Inc. Polypropylene Volumetric Flask W/Polypropylene Stopper,500mL Class B
Individually calibrated to deliver at 20C. Durable ring marks resilient wear. Supplied with standard ground polypropylene stopper. Certified Class B tolerance per DIN ISO 1042. Translucent with individual ring mark. Volume: 500ml Accuracy +/- ml: 0.40 Height: 270mm Stopper size: 19/26
Grainger WallPlate Blank 2 Hole White
The Monoprice Wall Plate is a single-gang Decora style wall plate made of high-impact plastic in white color. It features a flat design with rounded corners and measures 4.69 x 2.75 x 0.12 inches. This wall plate has a smooth finish and includes 1 Decora opening, allowing the installation of a single Decora rocker switch, outlet, jack or other device. It can be installed over any standard single-gang US electrical box and is UL and CUL listed. The wall plate is designed for indoor use.