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Rubber Diaphragms

Roxia rubber diaphragms for tower press filters combine professional moulding manufacturing and benefits of more than 40 years of experience in elastomer technology and high stressed rubbers. Each Roxia diaphragm is fully moulded, made with one pressing, resulting in smooth transitions and high quality. We focus on product advancement to extend lifetime and filter availability.

Improved functionality and extended lifetime

Roxia diaphragms for tower press filters have improved moulding. We use only one homogenous mould to get the best results and professional finishing. This and other improvements are based on valuable practical experience from the field and professional elastomer knowledge. The natural rubber (NR) compound is the most optimal for heavy duty filtration processes to endure immense pressures and have a longer lifetime.

To make overall better diaphragms and extend lifetime, several other improvements have been made. Diaphragm areas against pressing air/water outlet and feed inlet are now reinforced and therefore more durable. Grooves and pipes secure free air/water outlet, improving diaphragm’s functionality. All improvements contribute to better filter availability.

Available sizes and materials of Roxia rubber diaphragms

Choose from diaphragms for 1,6 m² (flat and cupped), 2,5 m² and 6 m² tower press filter plate sizes. Four different rubber compounds are available: IIR, NR, NBR and EPDM. See datasheet for more information.

Click here to see the mechanical properties of NR and NBR. Contact us to check mechanical properties of IIR and EPDM.

Diaphragms for PP filter plates

Roxia also offers pressing diaphragms suitable for filter plates made of polypropylene (PP). PP filter plates are mainly used in chemical industry, hydro-metallurgy and starch filtration. The reason to use PP plates instead of steel in those applications is mainly in better chemical resistance.

The diaphragm’s material is still rubber but there are a couple of structural differences when compared to steel plates:

  • When we are dealing with PP filter plates, the diaphragm’s edge also functions as the filter plate seal.
  • Diaphragms are fitted differently to the polypropylene filter plates. They are fixed into the groove at the bottom of the plate. Because of that another, separate part called feed shoe is needed to lead the slurry into the filtration chamber.

Feed Shoe

Feed shoe is a separate, integral part for the PP filter plates. Because the pressing diaphragm is fixed directly to the filter plate, slurry could not enter inside the chamber without the feed shoe.

Feed shoe therefore lifts the diaphragm in a specific spot and feeds the slurry inside the filtration chamber. The feed shoe has an additional Feed Shoe Seal on the bottom to seal the filtration chamber in that specific area.

Available as standalone spare part

Diaphragms for PP filter plates, feed shoes and feed shoe seals are directly connected to each other. They often do not have the same lifetime but usually feed shoe is sold together with seal in a package. This is the reason why Roxia can deliver the feed shoe seal or the diaphragm as a separate spare part. Contact us to get more information about the filter spares.

Local service, global availability

Roxia has local stock near to you. Enjoy prompt responses and fast deliveries at all times. Roxia filter service professionals are spread around the globe. Find your closest filtration specialist below.

Do you need assistance with filter maintenance and other issues?

Roxia filtration specialists provide you with professional support to optimize filter operations and extend the lifetime of spare parts. Besides expert on-site visits, Roxia has an innovative, turnkey solution: Roxia Smart Filtration. It enables remote, real-time insight into the filtration process and helps to troubleshoot and significantly optimize production. Smart Filtration utilizes existing control system and sensors and connects any filters to the Roxia Malibu™ online portal. It detects process abnormalities and automatically sends alarms to your email, assisting to prevent failures before they even occur.

Roxia rubber diaphragms  have been improved based on valuable practical experience from the field and professional elastomer knowledge.

Each diaphragm is fully moulded, made with one pressing, resulting in smooth transitions and high quality.



Diaphragm 6 m² tower press filter plate size. Other sizes are available as well. 


Diaphragms - Flowrox

Benefits & features


Longer lifetime

Most optimal natural rubber (NR) compound

Contact your closest filter service specialist:


Kimmo Kylämies
Product Manager, Filters
Tel: +358 (0)201 113 311

North America

Don Kitchen
Filter Spares Sales & Service Manager
Tel: +1-410-636 2250

Russia & CIS

Sergey Petukhov
Area Sales Manager
Tel: +7 495 726 57 41

South America

Eduardo Paredes
Regional Sales Director
Tel: +56 2 3224 9704

NOTE: Flowrox company rebrands to Roxia
NOTE: Flowrox pump and valve businesses sold to Neles