Test Tube Caps

PolyCone Lined Phenolic Caps form an exceptionally tight seal and offer a good chemical barrier. This liner molds itself around the sealing areas of the finish as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, binding and backing off. Great for everything from...

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...

Enhance your laboratory's efficiency and safety with the Chemglass PTFE NPT Plugs. Manufactured from polytetrafluoroethylene, these plugs offer superior durability and chemical resistance, perfect for rigorous lab applications. Their design fits seamlessly with NPT fittings, ensuring a secure seal...

Caps fit Corning media bottles, Erlenmeyer flasks and spinner flasks with standard GL threads. Standard Plug Seal Caps are autoclavable and use a linerless plug seal design for efficient sealing. Pouring Rings fit on the lips of bottles for drip-free pouring. Autoclavable Vented Caps have a 0.22...

Phenolic Pulp/Vinyl Lined Caps are perfect for general use. The liner is made of a vinyl coating applied to high density polyethylene coated paper and then it is laminated to pulpboard. This general purpose liner is commonly used for food, beverage, medical and chemical applications packed at less...

Replacement septa for use with MW-102 open-top screw caps on Minum-Ware® glassware components. Septa are made of silicone rubber with one side having a RED PTFE face, while the opposite side has an ultrathin covering of polypropylene to prevent needle coring when penetrating septa.

Enable rapid identification by using Thermo Scientific™ Nalgene™ HDPE High Profile Closures with Color Coders for Micro Packaging Vials. Closures have no O-ring to fall out or contaminate contents and are free of toxic heavy metals. Permanently attached color coded inserts do not come in...

Ideal for high purity chemicals, strong acids, solvents Excellent for environmental samples, pharmaceuticals and diagnostic reagents Teflon-faced foamed polyethylene liner offers the excellent chemical resistance of Teflon with the compressibility and sealing properties of polyethylene foam.

Choose the PTFE/Silicone Septa to resist coring and provide great resealability. These septa are available in a variety of colors for easy sample identification.

Made from polyethylene, these caps are sized to fit 5mm O.D. NMR sample tubes. Cap fits tightly to stay in place during increased internal vaporization pressure. Available in a pack of 100, or in a convenient divided polypropylene box having 100 each of the 6 listed colors.

Screw threads Choice of six liners

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...

With PTFE faced silicone liner 45mm screw thread Withstands temperatures up to 200C Autoclavable

Open top cap for use with GL screw threads. The cap combined with the CG-197 sealing ring will accommodate tubing of the listed diameter. Cap is made from PBT (thermoplastic polyester) and will withstand temperatures from -45 to 200°C.