Profiseal - Ship Technology
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Propeller Shaft Seals and Bulkhead Seals

Mühlerstraße 13,
55288 Schornsheim,

Fireproof bulk head

ProfiSeal GmbH designs and manufactures highly reliable propeller-shaft and bulkhead seals for the yacht and shipbuilding industry.

The company distributes Centa and IconPolymer products for workboats (including passenger and cargo-crafts), public authority crafts (including patrol boats), and yachts.

Propeller shaft seals

ProfiSeal propeller shaft seals are designed for shafts with diameters ranging from 20mm to 90mm and 100mm to 180mm, and are type-approved by GL, LR and ABS.

They are in use for water and oil-lubricated shaft systems and are installed in a vast number of governmental ships special crafts (such as patrol boats and vessels for police, customs and coastguard), working vessels like pilot boats, and commercial passenger ships, coasters, work boats and yachts.

ProfiSeal propeller shaft seal advantages

ProfiSeal shaft seals require very little maintenance. For aluminium hulls the housing and pneumostop flanges of the seals are also available in aluminium material. The seals are easily installed without the need of further adjustments, and ensure a long lifetime, even in extremely polluted waters. The facetype design of the seals eliminates shaft-wear.

Permitted shaft movements are as follows:

  • Allowed axial shaft movement: +/-5mm
  • Allowed radial shaft movement: +/-2mm

Propeller shaft seal accessories

ProfiSeal also manufactures a series of accessories for these shaft seals, including:

  • Pneumostop inflatable stand-still seal – this seal is available for shaft sizes from 500mm diameter, and allows the inspection or even repair of the propeller shaft seals while the vessel is floating
  • Standard installation flange – for easy installation of the ProfiSeal propeller shaft; this flange aligns and centres the seal with the stern tube, eliminating the need for costly welding or machining processes, specially on smaller boats and shaft sizes up to 50mm

Bulkhead seals

ProfiSeal bulkhead seals are designed for shafts with diameters ranging from 50mm to 400mm, and are type-approved by LR.
They are installed in governmental ships and special crafts like patrol boats, supply vessels, etc., as well as in commercial passenger ships, fast catamarans and yachts.

The unique seal ring balancing-system prevents unnecessary shaft wear. The seals are dry-running gap-seals and allow very high shaft speeds of up to 40m/s. The fully split design allows installation and maintenance without pulling the shaft. ProfiSeal bulkhead seals prevent shaft-surface pitting corrosion.

Permitted shaft movement is as follows:

  • Allowed radial shaft movement: +/-5mm

Fireproof bulkhead seals

The new ProfiSeal fireproof bulkhead seals are designed for shaft diameters ranging from 50mm to 400mm. They abide by IMO 2010 FTP Code, Part 3 and MSC85/26 standards.

Featuring electrically insulated shafts and bulkheads, the dry-running gap seals are easy to install, and do not interfere with cathodic protection systems.

Insulation and a sheet-metal cover are delivered with the seals, which can operate up to a maximum temperature of 950°C, and gliding speed of 40m/s.

Permitted shaft movement is as follows:

  • allowed radial Movement +/- 5 mm
  • allowed axial Movement theoretical unlimited

Water-lubricated rubber bearings

As the German distributor for Icon Polymer UK, ProfiSeal supplies water-lubricated rubber bearings for shaft diameters from 20mm to more than 1,000mm, and gliding speeds from 0.05m/s up to 35m/s. The bearings are accepted by all major classification societies.

The whole range of water-lubricated shaft bearings:

  • Are pollution-free
  • Ensure low friction losses, low abrasive wear and long lifespan
  • Achieve noise and vibration absorption

The bearing shells are manufactured from corrosion-resisting naval brass or synthetic Aqualine material and feature a tough, synthetic rubber lining. Alternative materials are also available.


ProfiSeal’s list of references includes Fassmer, Lürssen, FSG, Gebr. Friedrich, LUX-Werft, Bodan, Benetti, AR-Naval, Derecktor, Gdynia Naval Ship Yard, San Lorenzo, Työvene, Piening, Schaffran, and Thies Propeller.

ProfiSeal is a member of the German Boatbuilders Association (DBSV), and the German Yacht Industry Pool Deutsche Yachten, specialising in the super-yacht sector.

For more information on any of our products, please contact us using the details below.

The World’s First Fireproof Bulkhead Seal

In the event of an accident, bulkheads should not merely prevent water spreading through the entire hull after penetration, and neither should a fire in the engine room be able to spread to other parts of the ship.

ProfiSeal GmbH

Mühlerstraße 13

55288 Schornsheim