Which stopper is used in chemistry lab?

A laboratory rubber stopper or a rubber bung or a rubber cork is mainly used in chemical laboratories in combination with flasks and test tube and also for fermentation in winery.[1][2][3] Generally, in a laboratory, the sizes of rubber stoppers can be varied up to approximately 16 sizes and each of it is specific to certain type of container. As the rubber stopper is used in many experiments, some specific experiment requires a specific material. For example, the M35 Green neoprene stopper is for chemical resistance. For food fermentation, M18 white natural gum is preferred. For high temperature application, red or white silicone rubber stoppers should be used.

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(From left to right) One-hole Rubber bung size 10, Two-hole Rubber bung size 14, and Solid Rubber bung size 16

Sizes

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Rubber bungs can have one or more hole(s) for plugging in tubes depending on the specification of the procedures. To prevent the liquid chemical leaks or escape the container, the rubber bung should fit tightly to the container's opening; the dimension of the rubber bung is of concern. These are some of the sizes that are commonly seen in chemical laboratory.

(From left to right) Rubber bungs are aligned from size no. 1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, to 16, respectively. (Comparing to the ruler) Size No. Top
mm Bottom 000 12.7 8.2 12x75 test tubes 00 15 10 0 17 13 1 19 14 2 20 16 20x150 or 10ml test tubes 3 24 18 4 26 20 25x200(150) or 20ml test tubes 5 27 23 50 ml Flasks 6 32 26 250ml Erlenmeyer Flasks 7 37 30 500ml Erlenmeyer Flasks 8 41 33 ml Erlenmeyer Flasks/ Florence Flask/ Filter Flask 9 45 37 ml Erlenmeyer Flasks/ Florence Flask 10 50 42 ml Filter Flasks

ml Erlenmeyer Flasks/ Florence Flask

11 56 48 12 64 54 ml Filter Flasks 13 68 58 14 90 75 15 103 83 16 127 90

Additional images

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• Rubber bung size no.5 fits tightly on 50ml Pyrex® Flask

• Other equipments such as glass tubes can be plugged into the holes of the rubber stopper

See also

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References

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And use our quick & easy guide to identify which size of rubber stopper you need.

For small test tubes use #00 stoppers. Use #0 for large test tubes, and #1 for extra large. Use #6.5 stoppers for 250 ml flasks. Use a cork borer to drill holes in the corks.

Some lab work requires a full setup of glassware. You&#;ll need one- or two-hole rubber stoppers for those experiments, and use 5 mm glass tubing to connect to other apparatus.

Keep your chemistry experiments clean and safe with rubber stoppers! These sturdy plugs fit tightly into test tubes or flasks to prevent chemical leaks and spills.

Use rubber stoppers and lab-grade corks to contain liquids in test tubes and flasks

These #5 rubber stoppers are 23-27 mm diameter with two 5 mm diameter holes. No. 5 rubber stoppers fit Pyrex 125 ml Erlenmeyer flasks.

These #5 rubber stoppers are 23-27 mm diameter with one 5mm diameter hole. No. 5 rubber stoppers fit Pyrex 125 ml Erlenmeyer flasks.

These #4 rubber stoppers are 20-26 mm in diameter with two 5 mm diameter holes.

These No. 2 rubber stoppers are 16-20 mm diameter with two 4.8mm diameter holes.

These No. 2 rubber stoppers are 16-20 mm diameter with one 5 mm diameter hole.

These #10 rubber stoppers are 42-50 mm diameter with no holes. #10 rubber stoppers fit ml Erlenmeyer flasks and many thermos vacuum bottles.

You will always have the right size rubber stopper on hand with this 2 lb package of assorted solid, 1-hole and 2-hole stoppers ranging in size from #00 to #8. You get 60 stoppers total.

Get the rubber stoppers you need most with this one-pound assortment.

This set of six cork borers allows you to make uniform holes in rubber stoppers and corks to meet a variety of laboratory needs.

This core borer is used to make uniform, large 15 mm (9/16") diameter holes in rubber stoppers or corks.

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