Die-Cut Diaphragm Gaskets

A die cut diaphragm gasket is a flat, precision-cut sealing membrane that combines the flexing function of a diaphragm with the clean, repeatable geometry of a die-cut gasket. At Exactseal, we manufacture these parts to your specification – no two applications are identical, so every diaphragm gasket is built to your drawing rather than pulled from a shelf. Whether you need a thin sensing membrane, a flat separating diaphragm, or a gasket with an integrated diaphragm profile, we cut it to your exact dimensions in the material your assembly requires.

Precision Die-Cutting for Flat Diaphragm Gaskets

We produce flat diaphragm gaskets using die-cutting and CNC knife-cutting techniques. Die-cutting uses a steel rule die – a sharpened steel strip bent to the profile of your part – to cut accurate, consistent shapes across a production run, while CNC knife cutting handles low-volume and prototype work without hard tooling. Both methods deliver tight tolerances and repeatable geometry for demanding sealing applications.

Custom shapes: discs, rings, oval and rectangular membranes, and intricate multi-hole patterns cut to your drawing.
Bolt and port cutouts: center holes, bolt circles, and ported openings aligned to your flange or housing.
Size range: from small discs to large flat sheets, in a single die-cut operation.
Tight tolerances: accurate dimensions suited to flanged connections, pump and valve bodies, actuators, and regulators.

Material Selection for Die-Cut Diaphragm Gaskets

Choosing the right elastomer is where a diaphragm gasket succeeds or fails. We die-cut diaphragm gaskets from a broad range of rubber compounds, and can supply fabric-reinforced material where added strength and dimensional stability matter. We help you match the compound to your media, temperature, and flex requirements.

Nitrile (NBR) for general-purpose oil and fuel service.
EPDM for water, steam, and weathering resistance.
Viton / FKM for aggressive chemicals and elevated temperatures.
Silicone for wide temperature range and flexibility, including USP Class VI grades.
Fabric-reinforced material with nylon, Dacron, Nomex, Kevlar, or cotton for higher-strength membranes.

Material is available across a range of Shore A durometers – softer compounds (roughly Shore A 40-50) for delicate, low-force sealing and firmer compounds (roughly Shore A 65-80) for higher-pressure duty.

Custom, Made-to-Spec – Request a Quote

Every die-cut diaphragm gasket we make is built to your specification. Send us your drawing or a sample, along with the media, temperature range, and quantity, and our team will recommend a material and cutting method and return a fast quote. We build to your requirements – we do not sell stock parts or sheet material off the shelf.

Frequently Asked Questions

What is the difference between a die-cut diaphragm gasket and a molded diaphragm?
A die-cut diaphragm gasket is cut flat from sheet material for fast, cost-effective flat membranes and gaskets. A molded diaphragm is formed in a tool for three-dimensional profiles such as convoluted or rolling designs. We manufacture both and can advise which suits your part.

Can you die-cut a custom shape from my drawing?
Yes. Send us your drawing or sample and we will cut your diaphragm gasket to those dimensions, including custom outlines, bolt patterns, and port cutouts.

Which materials can you die-cut?
Nitrile, EPDM, Viton/FKM, and silicone are common choices, and we can supply fabric-reinforced material where added strength is needed. We help match the compound to your application.

Explore our full custom rubber diaphragm manufacturing capabilities, our broader die-cut rubber gaskets, and pump & valve diaphragm seals. Ready to start? Request a quote with your specification.