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
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.
Uline Rubber Pressure Pad For 24" Foot-Operated Impulse Sealer
Rubber Pressure Pad For 24IN Foot-Operated Impulse Sealer
Hach Company Stopper, Neoprene, Solid, Size 1, 12/pk
Recommended where natural rubber would deteriorate or be attacked.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, Red
Solid Rubber Stopper, #00, 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 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (15mm), Bottom (10mm). Length: (25mm).
Ace Glass, Inc. Septa, red rubber, sized for 14/20 joints, pk/144
Septa, red rubber, sized for 14/20 joints, pk/144
Ace Glass, Inc. Septa, red rubber, sized for 14/20 joints, sp/12
Septa, red rubber, sized for 14/20 joints, sp/12
Ace Glass, Inc. TRAP STOPPER VACUUM 29/32 TRAP STOPPER VACUUM 29/32
Stopper with 29/32 joint for use with a vacuum trap.
Ace Glass, Inc. 500mL gas wash stopper only, porosity C
500mL gas washing stopper with porosity C (25-50 micron) 25mm fritted disc diameter, and 40/35 joint. Inlet/outlet arms are 8mm O.D.