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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.
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Ultimate burst pressure is governed by the number of
stages in the seal.
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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.
Hydrocarbon
based for vacuum and elevated temperature use (100°C+)
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Ms (Gauss)
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Median Particle
size (nm)
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Viscosity (cp)
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Vapour Pressure
in Torr (20°C)
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SHGS4-U
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450
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10
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3500
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< 10-11
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For S.I.
units click here
PFPE
for hostile environments
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Ms (Gauss)
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Median Particle
size (nm)
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Viscosity (cp)
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Vapour Pressure
in Torr (20°C)
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SPBS26
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450
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10
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3000
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< 10-9
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For S.I.
units click here
Hydrocarbon
based for vacuum and non vacuum
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Ms (Gauss)
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Median Particle
size (nm)
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Viscosity (cp)
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Vapour Pressure
in Torr (20°C)
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SHAS1S2-A
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600
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10
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1200
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< 10-9
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SHAS1S3-A
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400
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10
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2000
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< 10-9
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SHAS1S3-B
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300
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10
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<1000
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< 10-9
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