Consider threaded screw closures for containers used for mixing, extended storage, transport, and delivery of liquid media, buffer solutions, culture media, non-hazardous chemicals or volatile organic substances and solvents. We offer many choices in screw closures including PTFE, PBT, PE, and black phenolic styles. A variety of liner options ensure compatibility with a wide range of chemicals. In line with our commitment to quality, all of our caps are made from high-quality materials and conform to GPI (Glass Packaging Institute) standards and ISO and ASTM specifications, as well as European DIN specs.
DWK Life Sciences I-Loc closures combine the advantages of an aluminum seal with the convenience of a screw cap. The innovative design consists of an open-top polypropylene (PP) screw cap, which is connected to a gray bromobutyl stopper. I-Loc closures are available in five different colors and can be autoclaved.
Closures for media bottles are available in linerless polypropylene screw thread caps that are an economical autoclavable solution with exceptional sealing qualities. They are available with an internal molded seal ring and in solid and open-top formats. Open top caps can be used in combination with bromobutyl rubber GL 45 stoppers to assist you with applications requiring a gas-tight seal of the container, such as storage of oxygen-sensitive materials or maintenance of anaerobic culture conditions.
Our premium caps, made from pigment-free polymer, reduce the risk of leaching and PTFE-faced silicone cap liners maximize leak tightness. We also offer tamper-evident PP screw caps for media and sample storage bottles to help preserve your samples and your piece of mind. The robust and durable three-hole cap systems provide tubing connection/distribution caps for the easy transfer of liquids or gases in and out of bottles under controlled conditions, reducing the risk of contamination or spillage. Multiple port connection screw caps are available to fit the various glass thread finishes on commonly used laboratory bottles such European DIN GL 25/32/45 and GLS 80 thread standards. Some of the distribution caps accept the semi-rigid PEEK, PFA, FEP or PTFE tubing, while others can be used with flexible silicone tubing and hoses. We’re happy to help you select the perfect cap if you have any doubts. Connector elements are also available for probes and stirrers.