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 Solid Rubber Stopper, #11, Black
Solid Rubber Stopper, #11, 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 (56mm), Bottom (48mm). Length: (25mm).
Enterprise Technology Solutions ACCO Rubber Finger Tips, Medium, 11/16" Diameter, 1 DZ, Amber
Fingertips feature deluxe-grade rubber construction to assure solid grip and long wear. Each tip has extra thick material for longer wear. Finger tip diameter measurements are approximate due to a few factors, including: natural variation in molded rubber materials, differences in where diameter is measures (inside vs. outside vs. flattened width) and slight stretch when handled.
Med Vet International Stacked Locking Hole Plate, 12 Hole, J0438LHP12
A construct using locking plates and screws acts as an internal/external fixator. The construct is stiffer than conventional plates and screws and will require less contouring as it is not essential that the plate contacts the bone. Locking plates and screws are particularly popular in TPLO where significant savings in time (and morbidity) can be made. Also useful in fracture work in situations where contouring and rigidity is a challenge. The head of Jorvet locking screws engages the plate in the standard format using a twin start fine thread. Jorvet screws are an exact fit for standard locking plates but utilize the conventional hex screwdriver rather than a star screwdriver.Locking screws are available in both 2.7 and 3.5 screw diameters. Each size requires its own dedicated drill guide. Jorvet locking plates have ‘stacked’ locking holes which allow more screws per bone fragment compared with dual hole type plates.Locking Plates 3.5mm Screw Hole - 12 Plate Length - 122
Hach Company SC4200c hole plug kit M20
This neoprene plug can be purchased as a replacement part in order to seal any of the five open holes in the SC4200 controller The plug does not allow for cable pass through
Grainger Stopper Sz 6 26 mm BDia Black 0 PK20
The Grainger 16ZD56 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 delay, and comfortable padded headgear. The helmet provides shade levels from 5 to 13 for optimal eye protection. It meets industry safety standards. This auto-darkening welding helmet is designed for reliability and durability.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #3, 35 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.
Grainger Stopper Sz 11.5 50 mm BDia Black 0 PK6
The Grainger 16VC11 is a single-phase, open drip-proof electric motor with a 1/3 horsepower rating. It operates on 115V AC power at 1725 RPM with a 48-56 frame size. This motor has a C-face endshield for easy mounting and features a cast iron frame and aluminum endshields. It can be used for various light-duty industrial applications.
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.