Liquids Research Limited produce conventional ferrofluids based on ferrite and metal particles. A wide range of ready made and custom made magneto-rheological dispersions are also available.


The philosophy of Liquids Research Limited is to supply specialist materials to the engineering industry who have an interest in developing new applications for these exciting materials.


As Europe's leading manufacturer of magnetic colloids and related materials, Liquids Research Limited is uniquely placed to provide a comprehensive consultancy service for their clients.


Apart from our standard catalogue products, Liquids Research have a number of client projects underway for development of tailored magnetic fluids, nanoparticles and magnetorheological dispersions.

Role of Ferrofluid in a Seal

Traditional labyrinth rotary seals require constant maintenance to perform at an optimum level. They are also subject to wear and accumulation of particulate material, which can compromise the performance of a seal.

By the use of a ferrofluid to act as a magnetic O-ring and used in conjunction with traditional labyrinth seals, a rotary seal is produced where the shaft of the seal provides hermetic sealing with zero leakage.


Due to the magnetic nature of the ferrofluid seal, foreign particles are actually expelled from the system rather than accumulated.

As the ferrofluid consists of a high quality lubricating oil there is minimal wear. Where a large pressure differential is required, ferrofluid based seals typically give a burst pressure of several atmospheres.Ultimate burst pressure is governed by the number of stages in the seal.

Other sealing applications include the use of ferrofluid to seal hard disk drives. Liquids Research Limited have a proven track record in providing high quality ferrofluids for vacuum and non vacuum sealing applications. We manufacture fluids of high colloidal stability in a variety of carrier liquids, including synthetic oils and in perfluoropolyethers (PFPE) for use in hostile environments.

Fluid specifications

Fluids with saturation magnetisation of up to 600 Gauss and greater can be produced with viscosities between 1000cp and 5000cp. See below for details. 


Low Starting Torque Hydrocarbon Based Ferrofluid

  Ms (Gauss) Median Particle size (nm) Viscosity (cP) Vapour Pressure in Torr (20°C)
SHAS1S3-LT 400 10 300 <1E-9

For vapour pressure in S.I. units click here

PFPE for hostile environments

Ms (Gauss) Median Particle size (nm) Viscosity (cP) Vapour Pressure in Torr (20°C)
SPBS26 450 10 3000 4E-9
 SPCS25-A  400 10  10,000 2E-11
 SPCS25-B  400 10  20,000  5E-13
 SPD-A  400 10  20,000  3E-16

For vapour pressure in S.I. units click here

Hydrocarbon based for vacuum and non vacuum

Ms (Gauss) Median Particle size (nm) Viscosity (cP) Vapour Pressure in Torr (20°C)
SHAS1S2-A 600 10 1200 <1E-9
SHAS1S3-A 400 10 2000 <1E-9
SHAS1S3-B 300 10 <1000 <1E-9

  For vapour pressure in S.I. units click here

Hydrocarbon for disc drive sealing

Ms (Gauss) Median Particle size (nm) Viscosity (cP) Vapour Pressure in Torr (20°C)
SHAS4-A 200 10 500 <1E-9
SHAS4-B 300 10
1000 <1E-9

 For vapour pressure in S.I. units click here

All viscosity values are ±10% unless otherwise stated and Ms values are ± 5% of the quoted values.
Viscosity measured at 27°C.

For further information on the use of vacuum sealing fluid click here.

Magnetorheological Fluids
Document Download
Ordering Information
Health and Safety

Typical heavy duty seals

Typical 10mm diameter seal


Contact us

Phone: +44 (0)1248 352204/354103
Fax: +44 (0)1248 352204/352497
Email: [email protected]


Liquids Research Limited (c) 2011

Mentec, Deiniol Road, Bangor, Gwynedd, North Wales, UK, LL57 2UP

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