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Test Tube Caps

Culture tube caps are essential pieces of laboratory equipment, as they ensure the safe handling of samples by sealing test tubes to prevent contamination. We have various caps available, including Kim Rak, Kim Kap, and NMR tube caps that are suitable for many uses and provide a tight and secure seal within the laboratory. Some stainless steel closures can provide storage for long periods. Depending on the sample access requirements, snap caps, and flange caps can provide a secure seal with minimal effort. Consider the tube, sample, and level of protection required to ensure the integrity of your results.

Test Tube Caps

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  • Preassembled 9mm Thread Caps

    Chemglass

    Pre-assembled closure and septa minimize contamination from handling. They are convenient and available in a variety of colors with your choice of septa.

  • 9mm Bonded Closures

    Chemglass

    Bonded closures feature clear PTFE/Silicone liner bonded directly to the closure without the use of glue or adhesives. These bonded closures provide a cost effective, integrated, one-piece system that eliminates costly line fallout. Closures are available in both pre-slit and non-slit designs.

  • Green Thermoset Solid Top Caps

    J.G. Finneran

    Thermoset closures are a strong closure with the wide range of chemical compatibility and a high tolerance for both hot and sub-zero temperatures with proper liner selection.

  • 12/13mm Snap Caps

    Globe Scientific

    These colorful snap-on closures are an effective way to recap blood drawing tubes, glass test tubes and plastic culture tubes. They are precision molded from low-density polyethylene (LDPE) and maintain a tight seal during centrifugation, agitation and refrigeration procedures. They are available in...

  • Test Tube Stopper Caps

    Caplugs Evergreen®

    Polyethylene test tube stopper caps are precision-molded and available in either our standard or flat-top style.  Stopper caps are available for every size of Caplugs Evergreen test tube from 8 mm to 17 mm.  Standard version is available in a wide variety of colors and flat-top version is...

  • CAP CRIMP 11MM SILVER

    Thermo Scientific
  • Foam Plugs for Test Tubes

    Chemglass

    FOAM PLUGS FOR TEST TUBES AND LABORATORY FLASKS, INDENTI-PLUGS, Economical Open-cell, 1.45 lb. uniform-density foam Breathable and non-absorbent Use over a wide temperature range Autoclavable Chemical resistant Proven safe for algae culturing Identi-Plugs® are for use with test tubes and flasks....

  • SureSTART™ 9 mm Screw Caps, Level 3 High Performance Applications

    Thermo Scientific

    Ensure the utmost security and integrity of your samples with the Thermo Scientific AVCS™ Screw Caps. This advanced closure system is designed to form a tight seal on 9mm bottles, offering superior protection in rigorous laboratory environments. Suitable for a wide range of applications, this...

  • Reusable Phenolic Screw Caps with Rubber Liners

    Corning

    These reusable Corning® caps are fabricated specially formulated phenolic resin to resist the effects of temperature and steam in autoclaving. Caps are provided with a glued-in white rubber liner.

  • Solid Top Closures, PTFE lined

    J.G. Finneran

    White polypropylene closure, PTFE lined. For  Boston Round Glass Bottles,  See  1204X96 -  1204Y17

  • Black Caps with PTFE-Faced Rubber Liners

    DWK Life Sciences (Kimble)

    Excellent for general laboratory use Specially formulated phenolic resin and liner adhesive to withstand the effects of repeated autoclaving PTFE-faced/general purpose white rubber liners are highly resistant to chemical effects Identified in ASTM Specification E982, Class A requirements

  • White Polypropylene Cap With Poly-Vinyl Liner

    DWK Life Sciences (Wheaton)

    Suitable for a wide range of applications Excellent moisture barrier Good for mild acids, alkalis, solvents, alcohols, oil and aqueous products Cap liner consists of one mil poly vinyl film bonded to one mil HDPE on a #30 white pulp paper backing. Superior to plain pulp paper because it provides...

  • Septa PTFE/Sil Bonded Closure Vials

    Chemglass

    These convenience packs come with 100 bonded closures and vials packed seperately. Closures with bonded septa are not attached.

  • labForce® Screw Cap with Tether and O-Ring, Opaque Orange

    labForce® (powered by Thomas Scientific)
  • 13mm Flanged Plug Cap

    Globe Scientific

    Plug cap, flanged. Fits most 13mm tubes Polyethylene (PE) Assorted colors available

  • Black Phenolic Caps

    DWK Life Sciences (Kimble)

    Screw threads Choice of six liners

  • 13mm Extended Controlled Dropper Tips

    DWK Life Sciences (Wheaton)

    Tip made of LDPE (Low Density Polyethylene) Extended controlled dropper tip dispenses one drop at a time Average drop size is 44uL

  • Open-Top Polypropylene Screw Thread Closures with Red

    DWK Life Sciences (Kimble)

    Convenient assembly of caps and liners Available with standard or pre-slit septa Autoclavable and used for multiple injections

  • PYREX® Polyethylene Snap Caps

    Corning

    These blue PYREX® polyethylene caps provide an economical closure for some volumetric flasks (See Nos. 5580, 5581 and 5600).

  • Silicone Sponge Closure, 13-18mm

    Bellco Glass

    For use with 18mm screw necks, 13-18mm Culture Tubes, 18-25mm Culture Tubes, 38mm Culture Tubes, 25-50ml Erlenmeyer Flasks, 125-300ml Erlenmeyer Flasks, 500-1000ml Erlenmeyer Flasks, 25-125ml DeLong Flasks and 250-6000ml DeLong Flasks. Sealed-in Silic

  • Double threaded caps for 5ml sample collection tubes, Natural, Sterile, 1000/pk, 10000/cs

    NEST Scientific USA

    Ensure the integrity of your samples with these sterile, double threaded caps designed specifically for 5ml sample collection tubes. Made from natural, durable material, the caps provide a secure fit, minimizing the risk of leakage or contamination. They are sold in bulk packs of 1000, with 10000...

  • PTFE Faced Silicone Septa 32mm

    Bellco Glass

    Open top caps are ideal for applications requiring addition/withdrawal of vessel contents. Autoclavable to 140ºC.

  • Encapsulated Kit, Includes Indium and Zinc

    PerkinElmer

    Encapsulated Kit, Includes Indium and Zinc Designed for precision and reliability, the Encapsulated Kit includes both indium and zinc for a wide array of research applications. This specialized kit ensures safe handling and accurate results, making it an essential tool for professionals in various...

  • 8mm Crimp Seals

    DWK Life Sciences (Wheaton)

    MicroLiter offers products for both LC and GC applications.

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What is a test tube cap?

A test tube cap is a closure used to seal the opening of a test tube, protecting its contents from contamination, evaporation, or spillage. These caps can be made from various materials, such as plastic, rubber, or silicone, and come in different designs, including snap-on, screw-on, or push-in types.

What is a septum on a bottle?

A septum on a bottle is a rubber or silicone seal typically fitted into the cap or closure of the bottle. It allows a syringe or needle to access the contents without fully opening the bottle, preserving a sterile environment and preventing contamination. Septa are commonly used in lab bottles or vials to store sensitive materials, such as reagents, chemicals, or biological samples. The septum reseals after the needle puncture and ensures the contents remain uncontaminated even after multiple uses.

What do test tubes with screw caps do?

Test tubes with screw caps securely seal the contents inside, providing a tight closure that prevents leakage, contamination, evaporation, or spillage. Screw caps create a strong seal, making test tubes ideal for storing, transporting, and mixing liquid or solid samples. Lab and healthcare professionals use them when handling volatile, sensitive, or hazardous substances, as the cap helps maintain the sample's integrity and prevents exposure to the external environment.
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