Laboratory rubber stopper

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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Its main function is to preserve the properties of the wine in time and to ensure that it evolves correctly in the bottle. 

The advantages of the cork stopper 

The cork stopper prevents a large amount of oxygen from penetrating, which would damage the wine. Indeed, they play an essential role in the quality of the wine. 

As explained above, the cork stopper has first of all a function of protection. This last one also plays another very important role as for the taste of the wine. Indeed, according to the cork stopper, the gustative characteristics will vary and will impact greatly the aromas of this last one. 

The disadvantages of the cork stopper 

Cork stoppers can also have certain disadvantages. We can notably mention the humidity. Indeed, for it to ensure its protective function, it must be slightly humid. Without this, the wine will lose its aromas and its conservation will be alternated. Moreover, a lack of humidity can dry out the cork excessively. This can cause the cork to break. If this happens, the wine will be altered because of the amount of air that will enter the bottle.  

The different alternatives 

In recent years, the cork stopper is sometimes replaced by synthetic stoppers. These have the same protective function as cork stoppers, preventing the passage of oxygen as well as bacteria and fungi. This alternative also has another important advantage: it does not break despite humidity and it does not produce dust. 

However, the use of synthetic stoppers is still very much in the minority and contested by many in the wine industry. Indeed, the cork stopper remains the best material to preserve the wine and its properties, this is due in particular to its proven effectiveness in the long term. 

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