Also known as rubber bungs, rubber stoppers are used to seal bottles, tubes and many other containers. They plug containers from the outside without displacing the volume inside.
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Some more resistant stoppers can also be used for heavy industrial processes.
Stoppers can be straight-edged, but mainly they have tapered sides. The bungs are partially inserted into a vessel acting as a seal.
The stoppers are often used in laboratories and other scientific settings, primarily to seal test tubes and other flasks. Scientists can connect these flasks to other apparatus using tubes which are inserted into small holes in the bungs.
Slightly elastic bungs are perfect for preventing gases and liquids from escaping. They can also help protect important products against contamination.
There are different types of rubber stopper:
They have different properties. This guide explains the benefits of each material and shows what should be used for each purpose.
The following bungs are all tapered, meaning they have wider tops than bottoms. This means the bungs fit more securely on a wider range of containers.
Rubber bungs need to fit tightly in their container opening so you need to pay close attention to the size of your bungs.
Ensure that the diameter of your container opening fits between the top and bottom diameters, so you can be sure of a tight fit for your bung.
Red rubber stoppers are mainly used in chemical laboratories in flasks and test tubes, but they can also be used in fermentation processes, for example in wineries.
Made from natural rubber, it uses polymers of the organic compound isoprene and is classified as an elastomer meaning it has a high stretch ration and high resilience. It is also extremely waterproof.
All the bungs are available with or without drilled holes, except the 3mm and 4mm red rubber bungs, which are too small to be drilled.
Other equipment such as glass tubes &#; connected to other lab apparatus - can be plugged into the rubber stopper holes.
Bungs with a bottom diameter between 5mm and 8mm are available with one hole of 3mm. Any bung with a bottom diameter over 9mm can have one hole of 5mm and any bung over 15mm can have two 5mm holes.
To help identify a bung&#;s size, each stopper has a moulded number which corresponds to the bottom diameter of the bung.
This product is manufactured to standard: BS: ().
Product Code
Bottom Diameter (mm)
Top Diameter (mm)
Length (mm)
RB003
3
4.5
12
RB004
4
5.8
14
RB005
5
7
16
RB006
6
8
16
RB007
7
9
16
RB008
8
10.5
20
RB009
9
11.5
20
RB010
10
12.5
20
RB011
11
14
24
RB013
13
16
24
RB015
15
18
24
RB017
17
20.3
26
RB019
19
22.5
28
RB021
21
24.5
28
RB023
23
26.5
28
RB025
25
28.5
28
RB027
27
31
32
RB029
29
33
32
RB031
31
36
35
Grey neoprene rubber stoppers can be used in tubes and bottles in the same way as the red rubber bungs.
Neoprene is a synthetic rubber with better chemical stability and heat resistance over a broad range of temperatures. It is used in a lot of processes &#; it can be used as electrical insulation and in other hostile environments.
The solid version of neoprene can be used as a bung because it has good resistance to petroleum based oils and other chemicals as well as ozone. It can also be used across temperatures ranging from -30°C to 100°C.
Bungs with a bottom diameter between 5mm and 8mm are available with one hole of 3mm. Any bung with a bottom diameter over 9mm can have one hole of 5mm and any bung over 15mm can have two 5mm holes.
To help identify a bung&#;s size, each stopper has a moulded number which corresponds to the bottom diameter of the bung.
This product is manufactured to standard: BS: ().
Product Code
Bottom Diameter (mm)
Top Diameter (mm)
Length (mm)
NB005
5
7
16
NB008
8
10.5
20
NB010
10
12.5
20
NB011
11
14
24
NB013
13
16
24
NB015
15
18
24
NB019
19
22.5
28
NB021
21
24.5
28
Manufactured from high-grade silicone, these plugs can be used at a huge range of temperatures &#; from -70°C to +250°C.
This means they can be used for heavy industrial processes and in environments where they will be exposed to extremes of temperature. They are also good resistant properties against acids, alkali solutions and weathering.
Hilltop Products stocks a huge range of sizes, so you can be sure to find one that fits your needs.
Bungs with a bottom diameter between 5mm and 8mm are available with one hole of 3mm. Any bung with a bottom diameter over 9mm can have one hole of 5mm and any bung over 15mm can have two 5mm holes.
To help identify a bung&#;s size, each stopper has a moulded number which corresponds to the bottom diameter of the bung.
This product is manufactured to standard BS: ().
Product Code
Bottom Diameter (mm)
Top Diameter (mm)
Length (mm)
SB003
3
4.5
12
SB004
The company is the world’s best function of rubber stopper supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
4
5.8
14
SB005
5
7
16
SB006
6
8
16
SB007
7
9
16
SB008
8
10.5
20
SB009
9
11.5
20
SB010
10
12.5
20
SB011
11
14
24
SB013
13
16
24
SB015
15
18
24
SB017
17
20.3
26
SB019
19
22.5
28
SB021
21
24.5
28
SB023
23
26.5
28
SB025
25
28.5
28
SB027
27
32
SB029
29
33
32
SB031
31
36
35
SB033
33
38.5
38.5
SB035
35
40.5
38.5
SB037
37
42.5
38.5
SB039
39
44.5
38.5
SB041
41
47
42
SB043
43
49
42
SB045
45
51
42
SB049
49
55
42
SB053
53
59.5
45.5
SB057
57
64
49
SB062
62
69
49
SB067
67
74
49
SB071
71
78
49
SB075
75
85
54
For more information about any stopper product, speak to a member of our knowledgeable sales team. Call: 723 101.
Rubber stoppers. You have probably encountered them countless times without giving them much thought. These small yet mighty objects play a significant role in our lives. From the laboratory to the kitchen, their versatile functionality says it all.
Even so, these essential components often go unnoticed &#; but not anymore! This blog will unveil the diverse functions and applications of rubber stoppers. Get ready to see these humble but powerful objects in a whole new light!
When you think about it, rubber stoppers are everywhere. They seal the openings of test tubes in the lab for accurate results. Or secure the freshness and flavour of your favourite beverages. They even safeguard the potency of medications to preserve effectiveness, and &#; overall:
But what are they, really?
Rubber stoppers can create a tight and secure seal in various applications. They are typically small, cylindrical plugs made from rubber or elastomeric materials. Their size is designed to fit into the openings of containers, tubes, or other objects.
The structure can vary depending on their specific purpose. Generally, they consist of a solid, dense core with a tapered or cylindrical shape. This allows them to fit securely into the opening they are intended for. The outer surface of the stopper is often smooth for easy insertion and removal. The inner surface, in contrast, may be ribbed or fluted to enhance the sealing ability.
As for the materials, the stoppers are usually made of:
The choice of material depends on the specific application requirements. Also, factors like chemical resistance, temperature resistance, flexibility, and durability.
Rubber stoppers create a tight seal when inserted into an opening. They work by forming a physical barrier that blocks the passage in and out of a container. When pressed or inserted into a container or tube, it exerts an outward pressure. This effectively seals the space against the walls of the opening. And this pressure helps to create an airtight or liquid-tight seal.
This sealing ability is crucial in a wide range of applications. In medical settings, the stoppers maintain the sterility and integrity of medications. In industrial settings, they help prevent leaks, spills, and so on.
Rubber stoppers have a wide range of applications across various industries and settings. Their versatility and sealing properties make up for this. Here are some examples of their uses, from laboratory to household settings:
Rubber stoppers play a crucial role in laboratories. Their function is to create airtight seals for various equipment, including:
If you are looking for one, check out these chemical-resistant rubber stoppers!
They come in with 1 or 2 holes ranging in size from 16 to 32mm and are suitable for almost all general laboratory uses.
In these fields, stoppers maintain the integrity and sterility of containers. Examples include the following:
Rubber stoppers find applications in industrial settings where sealing and containment are crucial.
Rubber stoppers also have practical applications in everyday household items, such as:
There are different types of rubber stoppers available on the market. Each type meets specific requirements and applications, and these are:
These stoppers are made of solid rubber and are used for general sealing purposes. They provide a tight seal and are available in various sizes to fit different openings.
As the name suggests, these stoppers have two holes drilled through them. They come in handy in lab use, where tubes or probes need to be inserted through the stopper while maintaining a seal. The holes allow for the passage of instruments or tubing.
Similar to two-hole stoppers, these stoppers have a single hole drilled through them. They are used when only one tube or probe needs to be inserted through the stopper while maintaining a seal.
These stoppers are have a special valve or slit. This feature enables the insertion of syringes, needles, or tubing. The self-sealing mechanism helps maintain a seal around the inserted object.
Lyophilisation is a process used in the pharmaceutical and biotechnology industries. For this type of stopper, it is specially designed to withstand extreme temperatures. Moreover, it holds out the vacuum conditions of the freeze-drying process. They ensure a secure seal and maintain the integrity of the lyophilised product.
Tapered stoppers have a cone-shaped design, gradually narrowing towards the bottom. This shape allows them to fit into various-sized openings, providing a tight seal. They are ideal in lab glassware or other containers with conical or tapered necks.
There are rubber stoppers with unique features or materials tailored for particular industries. For example, high-temperature-resistant stoppers. They are used in applications where elevated temperatures are involved. Another is the chemical-resistant ones designed to withstand exposure to corrosive substances.
The choice of the appropriate type of stopper depends on factors such as:
The availability may also vary depending on the supplier, industry, or specific requirements.
Rubber stoppers have proven themselves again, serving as barriers against contamination and leakage. They may be small in size, but their impact and functionality are mighty. They are an unsung hero in our quest for precision, reliability, and safety. So, the next time you encounter a rubber stopper, take a moment to appreciate its role and impact!
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