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 Stopper Only, Butyl Rubber, 5.4mm OAH
Stopper Only, Butyl Rubber, 5.4mm OAH. For CLS2408 Hungate Anaerobic Tubes.
Fireflysci Stopper 7 for P65 Series Cuvette Washers
Stopper 7 for P65 Series Cuvette Washers- Fits with FireflySci Vacuum Flask- Part of Cuvette Washer Kit
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 21 x 27 x 30 mm
Saint-Gobain Versilic silicone stoppers provide chemical and biological neutrality for reliable sealing in laboratory vessels. Designed for tissue culture, microbiology, hematology, and general laboratory applications, these compression-fit stoppers tolerate broad temperature cycles and resist aging.
- Material: Silicone.
- Dimensions: 21 x 27 x 30 mm (0.827 x 1.064 x 1.182 in).
- Pack size: 10 stoppers per pack.
- Temperature range: -94 to 482 °F (-70 to 250 °C).
- Compliance: Meets FDA and BGA standards.
- Key properties: Chemically and biologically neutral, odorless, tasteless, non-adherent, and resistant to aging.
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 17 x 22 x 25 mm
Solid silicone stopper designed for laboratory and process sealing applications; nominal 16 x 21 x 25 mm size, sold in packs of 10. Made from Versilic silicone and formulated for chemical and biological neutrality, this stopper provides a durable, non-adherent closure suitable for biology, microbiology, hematology, and food science uses.
- Made from peroxide-cured silicone for chemical and biological neutrality.
- Odorless and tasteless.
- Non-adherent and resistant to aging.
- Suitable for biology, microbiology, and hematology applications.
- Wide usable temperature range (approx. -70°C to 250°C).
- Sold in packs of 10 for lab convenience.
Cayman Chemical 384 SolId PlATlow vol 25ea
A sulfur-containing nucleoside triphosphate prevents complete digestion by 5-phosphodiesterase which allows for alkylation and identification of SNP-containing alleles when incorporated into allele-specific primers has been used for chain extension in PCR assays a mixture of Rp and Sp isomers