Stoppers

Photo of Safe-Lab® Glass Stoppers for Flasks w/Ground Joints
Lightweight hollow borosilicate glass stopper. Flat hex head for easy gripping. SAF-T-LINE® threaded polymethylpentene extracting nut above ground surface allows easy and safe removal of stopper from flask.
Photo of Cork Stoppers, Superior Grade
Standard length, superior grade cork stoppers are the finest grade stopper available. XXXX quality.
Photo of One Hole Black Rubber Stoppers

One Hole Black Rubber Stoppers, regular length. For general laboratory and other uses. Each stopper has its size in raised figures on top. Dimensions in accordance with NBS specifications. Sold by the pound. Same as R6200, except with one pre-drilled hole.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Twistit® White Rubber Stoppers

The versatile Plasticoid Twistit® White Rubber Stoppers are four stoppers in one. These multipurpose stoppers offer versatility not available with conventional stoppers. Three simple twist-off seals permit easy conversion from a solid to a one, two or three-hole stopper for all your laboratory needs. Soft, resilient, natural, white rubber demonstrates exceptional aging characteristics and withstands repeated autoclaving. Nipples can be “Twisted Off” revealing the through hole as needed.

Photo of Two Hole Green Neoprene Stoppers

Plasticoid M35 Green Neoprene Stoppers are pre-dilled with two hole. These stoppers are the same physical dimensions as our black rubber stoppers, but can be used in areas where rubber would be attacked by reagents or solvents. Synthetic, neoprene stoppers contain no free sulfur, exhibit good resiliency and shelf life. Green Neoprene Stoppers withstands petroleum products and oils as well as most inorganic acids and bases. Stoppers are a highly visible green color for easy identification.

(Sample Photo Displayed. Individual items may differ from the image shown.)
 

Photo of One Hole Green Neoprene Stoppers

Plasticoid M35 Green Neoprene Stoppers are pre-dilled with one hole. These stoppers are the same physical dimensions as our black rubber stoppers, but can be used in areas where rubber would be attacked by reagents or solvents. Synthetic, neoprene stoppers contain no free sulfur, exhibit good resiliency and shelf life. Green Neoprene Stoppers withstands petroleum products and oils as well as most inorganic acids and bases. Stoppers are a highly visible green color for easy identification.


(Sample Photo Displayed. Individual items may differ from the image shown.)

Photo of Solid Green Neoprene Stoppers

Plasticoid M35 Solid Green Neoprene Stoppers. These stoppers are the same physical dimensions as our black rubber stoppers, but can be used in areas where rubber would be attacked by reagents or solvents. Synthetic, neoprene stoppers contain no free sulfur, exhibit good resiliency and shelf life. Green Neoprene Stoppers withstands petroleum products and oils as well as most inorganic acids and bases. Stoppers are a highly visible green color for easy identification.


(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Two Hole Black Rubber Stoppers

Two Hole Black Rubber Stoppers, regular length. For general laboratory and other uses. Each stopper has its size in raised figures on top. Dimensions in accordance with NBS specifications. Sold by the pound. Same as R6200, except with two pre-drilled holes.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Solid Black Rubber Stoppers

Solid Black Rubber Stoppers, regular length. For general laboratory and other uses. Each stopper has its size in raised figures on top. Dimensions in accordance with NBS specifications. Sold by the pound.

(Sample Photo Displayed. Individual items may differ from the image shown)

 

Photo of Safe-Lab® PTFE Stoppers for Flasks w/Ground Joints
Solid PTFE stopper with extracting nut for flasks with ground joints.
Photo of Safe-Lab® PTFE Stoppers for Flasks or Funnels
Solid PTFE TFE stopper with threaded polypropylene extracting nut for easy removal of stopper from flask. Interchangeable with penny head stoppers.
Photo of Safe-Lab® Hollow PTFE Stoppers for Flasks w/Ground Joints
Use these hollow PTFE stoppers for boiling and distilling style flasks with ground joints. Stopper comes with polypropylene extracting nut for easy removal from flask.
Photo of Corning 7624 PYREX® Polyethylene Standard Taper Stoppers

These blue and white PYREX® stoppers are made from linear high-density polyethylene and have closed bottoms to conform to Standard Taper stopper dimensions. The three rings on the plug provide an efficient seal. This improved design fully protects the neck in the event of accidental tipping. These stoppers may be used in place of the conventional glass Standard Taper flask stoppers.

(Sample Photo Shown. Individual items may differ from the image shown.)

 

Photo of Corning 7570N PYREX® Hollow Glass Standard Taper Joint Stoppers

These hollow full length PYREX® Standard Taper joint stoppers are closed at the bottom. They are interchangeable with standard taper joints of the same size. These hollow stoppers are light in weight, yet very strong to reduce chipping and breakage, thus minimizing replacement costs. A barrel-shaped head means it is easy to clean and even easier to rotate in or out. Grooves in the sides help prevent slippage. The flat top allows the stopper to stand on its head, which frees the user's hand and minimizes potential contamination.

Photo of Corning 7650 PYREX® Hollow Glass Standard Taper Stoppers

These hollow glass PYREX® stoppers are light in weight, yet very strong to reduce chipping and breakage, thus minimizing replacement costs. A barrel-shaped head means it is easy to clean and even easier to rotate in or out. Grooves in the sides help prevent slippage. The flat top allows the stopper to stand on its head, which frees the user's hand and minimizes potential contamination. This PYREX® stopper is interchangeable with other common flask stoppers and fits all standard labware of comparable Standard Taper size.

Photo of Corning 7661 PYREX® Solid Glass Pennyhead Standard Taper Stoppers

These PYREX® solid glass pennyhead stoppers are generally used in flasks and separatory funnels.

(Sample Photo Displayed. Individual items may differ from the image shown.)

 

Photo of Kimble 41900R KIMAX Medium Length Standard Taper Pennyhead Glass Stoppers

Kimble 41900R KIMAX Medium Length Standard Taper Pennyhead Glass Stoppers are used with laboratory glassware such as flasks, mixing cylinders and separatory funnels. Standard Taper size 13 stopper is solid, stopper size 38 is hollow. Designed from ASTM Specification E675. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.

(Sample Photo Displayed. Individual items may differ from the image shown.) 

 

Photo of Kimble 41941R PTFE Flathead ST Stoppers for Bottles and Flasks, Color-Coded

Flat head PTFE stoppers are used as closures for laboratory glassware such as solution bottles and separatory funnels with Standard Taper (ST) medium length joints. Solid, bottle-style stopper made of PTFE that has excellent chemical resistance and resists freezing in ground glass joints. Color button insert on top of the stopper serves as a means of color coding.

(Sample Photo Displayed. Individual items may differ from the image shown.) 

 

.

Photo of Kimble 28016R KIMAX Linear HDPE ST Glassware Stoppers

Replacement stopper for glassware items that are ground to Standard Taper (ST) stopper dimensions. Yellow and blue stopper has a closed bottom. The enlarged flange is designed to protect the neck if the glass object is tipped over.

(Sample Photo Displayed. Individual items may differ from the image shown.) 

 

Photo of Kimble 41901R KIMAX PTFE Color-Coded ST Key-Head Stoppers, Flask Length

Kimble 41901R KIMAX PTFE Color-Coded ST Key-Head Stoppers are used with flasks, mixing cylinders, separatory funnels, etc. All stoppers, sizes 9 through 22 are solid, and sizes 32 and 38 are hollow. Designed from ASTM Specification E675.

(Sample Photo Displayed. Individual items may differ from the image shown)