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Gas Meter Diaphragm

A Metflex Gas Meter diaphragm has been designed and manufactured for use by the topmost diaphragm gas meter manufacturers across the globe. Serving the Energy market, Metflex Gas Meter Diaphragms are found in Modern Smart Meters, Domestic Gas meters, and larger industrial meters.

Metflex hold the largest market share for our range of gas diaphragms, as our chemists and engineers work alongside our customers and pull out all the stops to meet their needs.  Metflex Gas Diaphragms, often called membranes, are found in Gas Meters all over the world, from China to America, and Europe to the Middle East.

Metflex started out manufacturing Leather Gas Meter diaphragms, and then in the 1960’s work commenced in developing and producing a Rubber coated Polyester Fabric diaphragm. More recently has seen the advent of Dispersed Fibre Technology or DFT becoming popular as a choice of Diaphragm or Membrane material. Metflex diaphragms meet EN549.

Group of Main Diaphragms

Selection of Gas Meter Diaphragms that Metflex Manufacture

Our Service

Our precision moulded products are supplied worldwide, our leading position in this market is due to our bespoke service and quality products. We produce a large range of approved materials to suit the industry. Metflex are able to offer a complete service, incorporating material development, concept planning, full project management, design, manufacture and tool trialling. This suite of services ensures our customers receive rubber grommets that are the most suitable for their applications.


Full mixing facilities for the compounding of various rubber formulations including Nitrile, Natural, EPDM, Butyl and Neoprene. Fully equipped laboratory for compound testing and material development. Quality assurance and control throughout all stages of manufacture. Technical capabilities include:

Our material and technical capabilities are matched by our in-house and overseas manufacturing facilities, which include injection, compression and transfer and flashless/waste less moulding capabilities. In addition we also extrude, form and cut rubber to our customers’ requirements.


Metflex Gas meter diaphragm performance.

The performance of our Gas Meter diaphragms is of paramount importance to our customers.

The rubber membrane enables the Gas Meter to register correctly, giving highly accurate readings. It has to perform this function consistently throughout the lifespan of the Gas Meter and has become even more critical with the advent of Smart Metering.

The membrane works by ‘rolling’ back and forth on a sectional radius or ‘convolution’ and hence the Thickness of the rubber component is fundamentally critical to its function.

Metflex Gas Meter diaphragms are manufactured to be very thin (typically between 0.3-0.5mm) and must be controlled to precision level tolerances.

To do this Metflex deploy Statistical Process Control to monitor the consistency of component thickness. This gives us the ability to make data driven decisions regarding the process and ultimately provide assurance that the customer receives their product that will consistently perform to their requirements ‘straight out of the box’.

Manufacturing diaphragms at these thicknesses can also present other issues.

Durability of components at this thickness can be reduced. To address this problem, our highly skilled and experienced technical and material engineering staff developed DFT (Dispersed Fibre Technology). This innovative advancement, strengthens the diaphragm at a material structural level, and assures its continued performance throughout the full lifespan of the Gas Meter and beyond.

Thin rubber components of this nature can also be prone to ‘pinholes’. These are very small holes in the component which can let Gas through and cause the diaphragm to perform incorrectly.

To combat this Metflex tightly control the process from raw material to finished product to ensure no contaminate is present within the rubber, and utilise a stringent inspection regime, involving a dedicated ‘darkroom’ where any holes, small or large, very quickly become apparent.

All our product range is manufactured under the requirements of the Metflex Management System. Certified to the very latest ISO Quality Management standards (ISO9001:2015), demonstrating our ongoing commitment to providing first class leadership and helping our customers to effectively manage their risk…

… at the forefront of rubber component technology.

Whether you requiremain diaphragms in natural rubber, NitrileSilicone or a specific formulae, please do not hesitate to contact us for a no obligation discussion and quotation. Call 01254 884171 or Email Us