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 7 30 mm BDia Black 0 PK15
The Grainger 16ZD64 is a 3M Scotch-Brite General Purpose Hand Pad that can be used for cleaning and scouring. It features an open web construction with non-woven fibers that are non-scratching on most surfaces. This 6 inch by 9 inch hand pad has a medium duty abrasiveness level. It can be used wet or dry for scrubbing, wiping and polishing. The 3M Scotch-Brite material resists fraying and tearing.
Analytical Sales & Services 20ml Syringe with Rubber Piston, 500/Case
20mL Syringe with Rubber Pisto
Med Vet International Titanium 8-Hole Plate, J1072NFT
TTA (Tibial Tuberosity Advancement) CagesTitaniumPlate 8 hole x 104mm
Med Vet International Endotracheal Tube, J0148U, Red Rubber, 14.0mm, Each
Available in .5mm increments from 2.5 to 16.0mm. Murphy eye. Red rubber. Hard-to-find extra-large size now available. (adaptor not included except where specified)
Med Vet International "T"-Plate, 2mm, 4 hole, 18mm L, J0428A
Available for 3.5, 2.7, and 2.0mm screws, either cortical or self-tapping. "T" plates are used almost exclusively for the repair of fractures of the distal radius. In addition, they also may be used in a partial carpal arthrodesis.
Med Vet International Compression Plate 4.5mm, 4-hole, 71mm L, J0427C
Use with 4.5mm cortical screws to produce fracture-site compression.
Med Vet International Titanium 5-Hole Plate, J1072NCT
TTA (Tibial Tuberosity Advancement) CagesTitaniumPlate 5 hole x 65mm
Med Vet International Titanium 4-Hole Plate, J1072NBT
TTA (Tibial Tuberosity Advancement) CagesTitaniumPlate 4 hole x 52mm
Chemglass Life Sciences Rubber Stopper, #10-1/2, Two Holes, Black
Rubber Stopper, #10-1/2, 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 (53mm), Bottom (45mm). Length: (25mm). Diameter of holes: (5mm).
Ace Glass, Inc. Septa, white rubber, sized for 8mm OD tubing, pk/72
Septa, white rubber, sized for 8mm OD tubing, pk/72
Ace Glass, Inc. Septa, white rubber, sized for 9-12mm OD tubing, pk/72
Septa, white rubber, sized for 9-12mm OD tubing, pk/72
Chemglass Life Sciences Rubber Stopper, #2, One Hole, Black
Rubber Stopper, #2, 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 (20mm), Bottom (16mm). Length: (25mm). Diameter of hole: (5mm).
Chemglass Life Sciences Rubber Stopper, #13, One Hole, Black
Rubber Stopper, #13, 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 (68mm), Bottom (58mm). Length: (25mm). Diameter of hole: (5mm).
Chemglass Life Sciences Rubber Stopper, #4, One Hole, Black
Rubber Stopper, #4, 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 (26mm), Bottom (20mm). Length: (25mm). Diameter of hole: (5mm).