Aug. 11, 2025
Your Guide to Rubber Stoppers
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In laboratory science, details matter.
Quality reproducible results are only as good as the quality of materials used, the durable laboratory equipment used, and the facilitating scientist. Whether your lab’s processes are qualitative or quantitative, precision and care must be taken at all stages of work for the best outcomes, including selection and handling of all materials and supplies. For example, you might work with biological samples as well as chemicals and reagents in different capacities throughout the laboratory. Sometimes, labs function with several different testing procedures happening simultaneously. A quality control or quality assurance laboratory might test for several different variables in one product, or one variable for several different products. Considering the many booming scientific industries, possibilities for laboratory configurations remain endless.
These larger systems of study and testing must rely on their component parts, the smaller pieces of logistics and operations to support outstanding results and successful outcomes, for the information being sought. These component parts include high-quality laboratory supplies, down to the smallest item: enter the rubber stopper.
Test tubes are slender containers that hold small amounts of liquid or other materials used in testing and storage, for example, blood or tissue samples. Test tubes containing materials or reagents must be properly sealed and stored at all times. High-quality rubber stoppers make this possible. Most commonly made of natural, black rubber, they are pliable and fit tightly when the size is appropriately chosen according to test tube size and opening.
Below you will find a chart with common rubber stopper sizes, the diameter of the top and the diameter of the bottom of each stopper.
Your Guide to Rubber Stoppers
Rubber Stopper #: Top Diameter: Bottom Diameter: 000 13 mm 8mm 00 15 mm 10 mm 0 17 mm 13 mm 1 19 mm 14 mm 2 20 mm 16 mm 3 24 mm 18 mm 4 13 mm 8mm 5 27 mm 23 mm 5½ 28 mm 24 mm 6 32 mm 26 mm 6½ 34 mm 27 mm 7 37 mm 30 mm 7½ 39 mm 31 mm 8 41 mm 33 mm 8½ 43 mm 36 mm 9 45 mm 37 mm 9½ 46 mm 38 mm 10 50 mm 42 mmThe Lab Depot carries several different test tubes from different manufacturers. The United Scientific rubber stoppers we sell will fit all test tubes, based on the sizing chart listed here. They are autoclavable and best for non-aggressive, concentrated solutions.
Considering even the smallest details of your laboratory’s operations yields the highest quality results, even down to the rubber stoppers you use to secure your test tubes. Great science calls for precision. Ensure the quality and reliability of your laboratory’s applications by making sure you are using the best products available.
©The Lab Depot
When it comes to pharmaceuticals, the quality of the packaging material is incredibly important. Rubber stoppers are one component of pharmaceutical packaging that can significantly impact the product’s efficacy and shelf life. If you’re in the market for rubber stoppers for your pharmaceutical manufacturing needs, here’s where you can find them.
The company is the world’s best pharmaceutical rubber stoppers supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
One of the easiest ways to find Rubber stoppers for pharmaceuticals is through online suppliers. A quick Google search will provide you with numerous results for Rubber Stopper manufacturers and suppliers. Online suppliers are convenient because they allow you to browse through a wide range of products and compare pricing and quality. Plus, you can easily order products and have them shipped right to your facility.
If you prefer to source your materials locally, specialty stores that cater to pharmaceutical manufacturers may also carry rubber stoppers. These stores often carry a range of packaging materials and equipment, and may have rubber stoppers in stock. They can also offer advice and guidance on which products are best suited for your needs.
Another option is to contact the manufacturer of your pharmaceutical packaging equipment and ask them for recommendations on where to buy rubber stoppers. They may have preferred suppliers they work with, or can give you advice on what to look for when sourcing for yourself.
Trade shows and industry events are a great way to learn about new products and suppliers. Many rubber stopper manufacturers exhibit at these events, so you can see their products up close and discuss your specific needs with their representatives. You can also network with other professionals in the industry, which can lead to valuable connections and information.
When purchasing rubber stoppers for pharmaceuticals, there are a few key factors to keep in mind.
1. Quality: The quality of rubber stoppers can vary widely, and you want to make sure you are buying from a reputable supplier that provides high-quality products.
2. Compatibility: Rubber stoppers should be compatible with the type of vial or container you are using. Make sure you are purchasing the correct size and type of stopper for your needs.
3. Functionality: Rubber stoppers should seal tightly and prevent contamination and evaporation. Check to see if the stoppers have any additional features, such as vacuum sealing or tamper-evident seals.
In the end, the right choice for purchasing rubber stoppers for pharmaceuticals will depend on your needs and preferences. However, by considering the above factors and exploring different options, you can find a supplier that meets your requirements. Contact us to learn more about the rubber stoppers we offer, or check with your preferred supplier to see if they carry the type of stoppers you need. Regardless of where you buy them, it’s important to choose rubber stoppers that will help ensure the quality and safety of your pharmaceutical products.
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