Silicone and rubber diaphragms
We are a rubber diaphragm manufacturer according to individual customer requirements, producing diaphragms in all common elastomers with flexible batch sizes using our in-house toolmaking.
- Customised production
- Batch sizes 1 to 1 million units.
- Express production from 2 weeks
- 100% Reliability & proactivity
Custom rubber diaphragms direct from the diaphragm manufacturer
Diaphragms are moulded rubber parts or moulded silicone parts that allow a stroke movement perpendicular to the clamping plane. As a result, they not only reliably separate media chambers from one another but also convert pressure – for example from pneumatic or hydraulic systems – into mechanical force. Conversely, a mechanical movement can be used for targeted volume displacement, for instance in pumps or dosing systems. For more than 35 years, we have been manufacturing custom rubber diaphragms based on your drawing.
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Structure & function a rubber membrane
At GUME, every rubber diaphragm is custom-made. By adapting the diaphragm geometry, defined force-travel curves and restoring behaviour can be achieved. Where required, we use rubber-to-metal bonded parts or rubber-to-fabric bonded parts to tailor the diaphragm precisely to your application.
Wulst Geometry
The bead can be designed as a sealing bead, round bead, double bead or wedge bead. The sealing bead is only used on one side of the flange and generates a linear surface pressure. A round bead is used on both sides of the flange and enables an even distribution of stress, while a double bead provides additional protection against slipping out in the case of components subject to high mechanical loads. A wedge-shaped bead generates an increasing clamping force under load.
Dome geometry - workspace
The dome height is decisive for the maximum working stroke that the rubber diaphragm can cover. The higher the dome, the more stroke is possible. With a customised rubber diaphragm, predefined load-displacement curves can be generated in combination with the thickness of the diaphragm walls, the angle of the diaphragm wall and the curvature of the centre of the diaphragm. As a rubber diaphragm manufacturer, we select the geometry and material so that the moulded parts fit your application exactly.
Centre
The mechanical connection to the rest of the assembly is attached to the centre of the dome. Depending on the application, plastic or metal pump rods or tappets can be vulcanised directly onto the centre, so that the component is precisely tailored to your application.
Outdoor area
If a hub is required in both directions, rubber diaphragm manufacturers incorporate a bead into the outer area between the bead and the dome. The amplitude of the diaphragm is controlled by the depth of the bead.
material insert
For high pressure loads and long service lives, fabric reinforcement is used. Depending on the application, this can be circumferential rings, continuous fabric, or special shapes. Suitable fabric materials include polyester, polyamide, or aramid fibres. Stub structures in the dome made of metal or plastic are also possible.
Materials for your custom rubber diaphragms
As a rubber diaphragm manufacturer with more than 35 years of experience in processing rubber, we work together with our customers to select the right material for each application.
Contact us for a free material consultation on your rubber diaphragm.
Sectors / Applications of Rubber membranes
As a rubber diaphragm manufacturer, we develop and produce components that perform precise sealing, separating and compensating functions in technical systems by reliably separating media chambers from one another while elastically accommodating movements, pressure changes or control processes. Rubber diaphragms are therefore used wherever processes must be controlled safely, sensitive media must be guided in a controlled manner and high demands on function, hygiene and resistance must be met.
Rubber diaphragms in mechanical and plant engineering
Rubber and silicone diaphragms are often used for hydraulic and pneumatic systems.
In pressure regulators, a rubber diaphragm converts the applied fluid or pneumatic pressure into a defined mechanical movement, which controls valve positions via spring or lever mechanisms. In diaphragm pumps, the cyclic deformation of the diaphragm creates a volume displacement for conveying liquids or gases. The elastic diaphragm reliably separates the drive chamber and the conveyed medium, preventing leakage or contamination.
Rubber diaphragms in food technology and filling systems
In hygienic valves, dosing pumps and pressure control components, silicone diaphragms are
mostly used. They provide sealing on the media side and separate food from drive or control chambers. In diaphragm valves, FDA-compliant rubber diaphragms control the flow of liquids such as milk, beverages or process water. In dosing and diaphragm pumps, the cyclic deformation of the diaphragm enables precise volume delivery. Silicone diaphragms are frequently used in food technology due to their high temperature resistance, sterilisability and low interaction with sensitive media.
Rubber diaphragms in laboratory and medical technology
Silicone diaphragms are frequently used in medical technology, where biocompatibility, sterilisability and chemical inertness are required. Diaphragms are used in micro-dosing pumps, analysers, diagnostic platforms, and ventilation and infusion systems. Thanks to their elastic deformation, they enable defined volume delivery and reliable separation between the drive mechanism and sensitive media. In many devices, they also serve as flexible pressure elements for signal transmission in sensor and control components.
We manufacture even the most complex diaphragm geometries!
Put us to the test!
- Toolmaking is our core competence
- 100% in-house expertise
- Fast response times for tooling modifications
Insights into our customers'
diaphragm projects.
Rubber diaphragms in industry: surround diaphragm in loudspeaker manufacturing
The challenge
A loudspeaker manufacturer developed a new generation of high-performance speakers and required an optimised rubber surround diaphragm. The goal was maximum acoustic performance with the smallest possible installation space, long service life, and complex joining processes.
Implementation
Following the manufacture of the initial prototypes, several compounds were tested to achieve the best vibration properties. Based on these tests, we have moved to production-friendly
Advice on the design of the diaphragm and joining processes for the frame and coil.
Solution
Following successful validation, the solution was transferred to series production. We act as a technical development partner and sparring partner for the overall design, ensuring process-stable series production.
Do you have questions about rubber diaphragms?
We have answers!
When are fabric-reinforced rubber diaphragms useful?
Fabric-reinforced rubber diaphragms are used when high pressure loads, large pressure differentials or strongly cyclical movements occur. A textile insert – often made of polyester, polyamide or aramid – limits the elastic stretching of the rubber diaphragm and increases tear resistance, pressure resistance and dimensional stability. This means the effective diaphragm surface remains geometrically stable even under high load. Typical applications include pressure regulators, valves, pumps, and pneumatic actuators. The reinforcement reduces material fatigue, increases operational reliability, and significantly extends the service life of the rubber diaphragm under dynamic stress. We would be happy to advise you on selecting the appropriate fabric for your rubber diaphragm.
How do pressure cycles and dynamic loads affect rubber and silicone diaphragms?
Pressure cycles and dynamic loads lead to repeated elastic deformations in rubber or silicone diaphragms, which can cause material fatigue. The degree of strain amplitude, cycle frequency, and temperature are significant factors. High cyclic stress can lead to microcracking, compression set, or crack propagation in the rubber diaphragm. A suitable diaphragm geometry, matched Shore hardness, and elastomer-specific compounding reduce these effects. In addition, optimised clamping areas and uniform stress distribution improve fatigue life, ensuring our rubber diaphragms remain functional even after millions of load cycles.
How is a rubber diaphragm clamped or fixed into a housing?
The rubber diaphragm is usually secured in the housing via a circumferential clamping edge. This clamping edge lies between two housing halves or is held positively and non-positively by retaining rings or flanges. The defined compression prevents relative movement and simultaneously ensures a seal between the diaphragm and the housing. For higher pressure requirements, profiled clamping surfaces or metallic support rings are also used. If you are not yet sure which clamping concept to use, please feel free to contact us – we will help you select the suitable design.
What tolerances are common for rubber diaphragms?
The dimensional tolerances of an elastomer diaphragm are usually defined according to DIN ISO 3302-1. Tolerance classes M1, M2 or M3 are used for technical rubber components. The design of the diaphragm thickness and the clamping edge are particularly critical, as they directly influence the spring behaviour and pressure transmission. Precise tool design and stable process control are important to ensure a reproducible rubber diaphragm.
Can diaphragms be combined with metal or plastic inserts?
Yes, rubber membranes and silicone membranes can be combined with metal or plastic inserts to integrate additional functions. Metal inserts increase dimensional stability, enable defined stop surfaces, or serve as connection elements to mechanical assemblies. Plastic inserts are often used to reduce weight or realise complex geometries. The connection is usually made by vulcanisation directly onto the insert.
When is a custom rubber diaphragm worthwhile compared to a standard solution?
A custom rubber diaphragm is worthwhile if standard components do not sufficiently meet design or functional requirements. This applies, for example, to defined spring characteristics, special installation spaces, high pressure loads, or particular media and temperature resistance. Through adapted geometry, diaphragm thickness and material selection, the deformation behaviour can be precisely tailored to your application. Furthermore, functions such as sealing lips, reinforcement zones or metal, plastic or fabric inserts can be integrated. An individual rubber diaphragm thereby increases your process reliability, the system's service life and system efficiency in demanding technical applications.
What factors influence the cost-effectiveness of rubber membranes in production?
The economic efficiency of a rubber or silicone membrane is determined by the tool concept, number of cavities, cycle time, and material costs. The choice of elastomer compound influences material costs and processability. Thin-walled geometries and uniform wall thicknesses allow for shorter vulcanisation times. For small batches or special designs, compression moulding with manual work steps is usually used due to the lower tool costs.
For large series, we use multi-cavity moulds in the injection moulding process and optimised mould temperature control, which significantly reduce the costs per component and at the same time increase process stability.
