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
Mitegen Au-Flat TEM Grid, 2µm Hole Pattern on 200 Gold Mesh, For Cryo-EM Sample Preparation,
The Au-Flat TEM Grid features a precise 2 µm hole pattern on a robust 200 gold mesh, making it an essential component for high-resolution cryo-electron microscopy (cryo-EM) sample preparation. Crafted from high-quality gold, this grid offers excellent conductivity and stability, which are critical for optimal imaging performance and minimizing sample drift in cryogenic environments. The uniform hole pattern facilitates consistent ice thickness and particle distribution, crucial for achieving high-quality data. Designed for reliability and ease of handling, these grids support a streamlined workflow for vitrification and subsequent imaging. They provide a stable and optically clear substrate for delicate biological specimens, contributing to enhanced resolution and reproducibility in structural biology research. This product is supplied in a convenient box of 50 grids, ensuring an ample supply for demanding, high-volume experimental needs in cryo-EM.
SIGMA ALDRICH FINE CHEMICALS BIOSCIENCES SLEEVE STOPPER SEPTA FKM
NC3257959 SLEEVE STOPPER SEPTA FKM
WEST PHARMACEUTICAL SERVICES INC STOPPERS STERILIZED 500PCS/BAG
NC3842868 STOPPERS STERILIZED 500PCS/BAG
Chemglass Life Sciences Rubber Stopper, #13-1/2, Two Holes, Black, Each
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.
Thermo Scientific Cap Liner for 1 and 2 L Bottles (Teflon)
Cap Liner for 1 and 2 L Bottles (Teflon).
Metrohm USA SCREW NIPPLE
Made of PP. For 6.1448.010 Septum or for mounting 6.1403.040 Drying tube or 6.0338.100 Electrode in 6.1414.030 and 6.1414.040 KF Titration vessel lids. Used for KF titrations.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #11 1/2, 63 x 50 x 25mm, 5 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Solid rubber stoppers are molded in the USA accordinig to standard industry size specification. Packaged in approxinmately one pound packages.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #11, 6 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 accordinig to standard industry size specification. Packaged in approxinmately one pound packages.?