Laboratory rubber stopper

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A laboratory rubber stopper or a rubber bung is mainly used in chemical laboratory in combination with flasks and test tube and also for fermentation in winery.[1] Generally, in laboratory, the sizes of rubber stopper 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 experiment, some specific experiment requires a specific material. For example, the M35 Green Neoprene is for chemical Resistance. For food fermentation, M18 white natural gum should be used. For high temperature application, red or white silicone rubber stopper should be used.[2]

File:Rubber stopper holes.jpg
(From left to right) One-hole Rubber bung size 10, Two-hole Rubber bung size 14, and Solid Rubber bung size 16

Sizes

Rubber bung can have one or more hole(s) for plugging in tube depending on the specification of the procedures. In chemical laboratory, to prevent the liquid chemical leaks or escape the container, we need the rubber bung that fit tightly to the container's open, therefore, the dimension of the rubber bung is concerned. These are some of the sizes that are commonly seen in chemical laboratory.[3][4]

File:Rubber stopper size.jpg
(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[5]		 Bottom
mm[5]		 Container type (Pyrex®)
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 1000ml Erlenmeyer Flasks/ Florence Flask/ Filter Flask
9 45 37 1000ml Erlenmeyer Flasks/ Florence Flask
10 50 42 1000ml Filter Flasks

2000ml Erlenmeyer Flasks/ Florence Flask
11 56 48
12 64 54
13 68 58
14 90 75
15 103 83
16 127 90

Additional imgages

  • Rubber bung with flask.jpg

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

  • Test tube filled with rubber bung.jpg

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

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.

External links

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