Rubber stoppers are small pieces of rubber that are used for various purposes. The most common use of rubber stoppers is to seal the openings of flasks, vessels, test tubes, and other containers. 

However, rubber stoppers are also used for closing small openings. Stoppers are made up of cork and other materials, but rubber stoppers are the best stoppers for common use. 

People are more likely to use rubber stoppers for sealing purposes. There are several types of rubbers available in the market. The availability of such a large number of stoppers has made it quite difficult for people to select the perfect rubber stopper.  

Things to consider while choosing rubber stopper

The following are some of the most significant factors that people need to consider while choosing rubber stoppers.

1. Check the bottom diameter

The first thing to look for while selecting the right rubber stopper is to check the bottom diameter of a rubber stop. You have to check the bottom of the rubber stopper. Choosing rubber stoppers having the biggest diameter is appreciated. 

The bottom diameter of the rubber stopper should be a little bit larger than the size of the hole. This creates the rubber stopper to completely fit into the vessel or a container. 

2. Check the temperature resistance

The second factor you need to consider while selecting a rubber stopper is to check whether the rubber stoppers are temperature resistant or not. The rubber stoppers should be resistant enough to withstand severe temperatures. The rubber stoppers you choose should be of high quality.

3. Know for which purpose you are purchasing

The third factor that you have to look for while choosing rubber stoppers is that you should be very clear about the use for which you are purchasing rubber stoppers. Sometimes rubber stoppers are used to stop gas or liquids from escaping from vessels.

The container containing gas or liquid can be a flask, a test tube, or a glass vessel. Sometimes, rubber stoppers are also used to stop the liquid or gas from contamination. Moreover, rubber stoppers are likewise used to cover the mouth of the test tube. So you should be very clear about the purpose of using rubber stoppers.

4. Consider the shapes

Rubber stoppers are also available in several shapes and designs. Some rubber stoppers have two holes that are used to enter thermometers and pipettes into a test tube or a vessel.

5. Consider the sizes of rubber stoppers.

Rubber stoppers come in several sizes. Rubber stoppers have a certain diameter. The size of rubber stoppers varies depending upon the sizes of vessels, flasks, test tubes, and other containers. 

Rubber stoppers have a certain diameter starting from 0.5 inches to 5 inches. Small rubber stoppers are designed for test tubes, while diameters having big diameters are used for beakers and vessels.