Test Tube Caps

Solid virgin PTFE liners can be manually inserted into closure and maintains a snug friction fit. PTFE liners are also available in other sizes and thicknesses.

Colored screw caps for micro tubes Types A - I; for custom coding.

Black phenolic screw cap Poly-Seal liner is manufactured from low density polyethylene Unique cone liner design offers superior torque retention and excellent sealing characteristics It is recommended that liner be tested prior to use for leak resistant applications

One piece tear-off style aluminum seal Allows for easy access to vials Fits aluminum seal finish: 13 Color: Natural 1000 seals per case

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.

Open top closures with excellent chemical resistance Specially formulated phenolic resin to withstand the effects of repeated autoclaving Linerless Identified in ASTM Specification E982, Class A requirements

Made of polypropylene Caps are available either with or without a silicone washer between the cap and the tube to ensure a positive leakproof seal at all temperatures. Closures and tubes are both manufactured of polypropylene, providing the same coefficient of expansion. The cap features a long...

1228A16, A17 and A25 are for use only with NALGENE narrow- and wide-mouth bottles and Erlenmeyer flasks 1228A27 is for use with carboys Autoclavable Available in natural and amber

Semi-Automated Handheld Screw Cap Decapper, 8-channel provides users with a flexible solution for capping and decapping 96 format screw caps for low-to-mid throughput environments, with easily interchangeable cartridges to switch between tube types. The 8-channel hand-held capper and de-capper...

As part of the prestigious National Scientific brand, our black 11mm snap caps are expertly designed to offer convenience and security for scientific applications. Crafted for durability and reliability, these caps provide an effortless snap-on feature, ensuring easy application and removal without...

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

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...

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...

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

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...

MicroLiter offers products for both LC and GC applications.

Ideal for a variety of laboratory applications, this white polypropylene cap is designed to provide a secure fit for a 33-400 neck size bottle. Its robust construction ensures durability and reliability for long-term use. The cap also features a foam polyethylene liner, which serves as an excellent...

MicroLiter Certified ULTRAPure Septa caps ultra-low bleed silicone inserts in 11 mm silver aluminum crimp caps are available in non-silted and silted versions. Ultra-low bleed blue/teal silicone Shore A is laminated to white PTFE film, 3 mm thick. Silver aluminum crimp caps are lacquer coated....

These polyethylene (PE) plug caps are designed in 11mm, 12mm, 16mm and 17mm sizes and are available in a selection of colors for sample identification.

Use these caps with WHEATON or other manufacturers# glass bottles or vials White polypropylene screw cap provides clear surface for writing on cap Foamed polyethylene liner provides chemical resistance for acids, alkalis, solvents, alcohols, oils, household cosmetics and aqueous products Liner...