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publication date: Jul 27, 2021
author/source: Worldwide Glass Resources


A new Zero-Bubble septa (ZB Seal™ Closure) has been engineered and designed by (ILT) specifically for EPA vials. 

This revolutionary compression molded PTFE/Silicone liner is assembled into a 24-414 Heavy Walled cap to create the ZB SEAL™ Closure system. 

This complete liner system reduces liner fallout and enhances long term storage of samples. 

The product greatly reduces the chance of over torqueing and the probability of an air bubble (Headspace). The molded PTFE/Silicone liner is designed with a convex feature that displaces the liquid as the closure is applied and effectively seals out air. This helps to maintain sample integrity from the time of collection up to the point of testing.

The ZB SEAL™ Closure is manufactured in a clean environment on state-of-the-art automated production lines that can meet the stringent demands of high-volume labs.

The PTFE surface of this cap design is compatible with volatile solvents and can be used with EPA VOA vials used in all methods.

If sample preservation and Zero-Bubble is critical then the ZB SEAL™ Closure is a must.



  • Molded PTFE/Silicone Liner
  • Heavy walled 24-414 cap
  • Reduce the probability of headspace (air bubbles)
  • Septa conditioned to the cleanest standards
  • Available in 24-414 white closures


Since our inception in 2001, Worldwide Glass Resources®, has emerged as a premier solution provider offering engineering and technical expertise in the design and production of laboratory and packaging vials and accessories.  We are “Serving Scientists Worldwide” every day through our global network of distributors, OEMs, and packaging companies.

We serve a multitude of markets including Pharmaceutical Research & Development, Environmental, Petrol-Chemical, Food & Fragrance, Biotech, Diagnostics, Forensics, Government, and University labs.

Our years of collective multidisciplinary experience can be found in the areas of laboratory research, production and engineering, quality, and customer service.  We draw from these strengths to deliver a holistic experience for our customers by offering products and services that meet or exceed their expectations.

Since the beginning, we have worked hand in hand with scientists as part of their team, bringing new concepts to market.  Maintaining these relationships has enabled us to remain on the forefront of innovation and solutions.  We position ourselves as an extension of our customer’s operations, reaching out to meet their challenges as our own. Bringing more efficiency and new customized products to the labs allow the scientists to do what they do best, Science!

(ZB SEAL™ Closure is a Trademark of Worldwide Glass Resources, Inc.)

(Plug Seal™ Closure Trademark of ILT)


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