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Seals, gaskets, O-rings, enclosures and mastics can be highly
sensitive to changes in pressure, temperature and other conditions.
Even worse is that many, while forming a good barrier to water,
allow water vapour to pass straight through. Versaperm Limited,
a world leader in water vapour permeability measurement, has introduced
a quick and simple way to test the materials, the seals and the
Water vapour is extraordinarily
invasive and the problems it causes have been estimated to cost
hundreds of millions of pounds in the UK alone each year. A simple
programme of testing is often all that is needed to ensure that
seals are effective – solving many of the problems that
poor sealing can cause.
The Versaperm WVTR
(Water Vapour Transmission) meter was designed for this task.
It can cope with several samples at a time, often give a reading
in as little as 30 minutes – whereas the conventional gravimetric
measurement technique takes several days and is significantly
The WVTR meter is easy
to use and gives a series of digital readouts that can be recorded
or simply read off a screen. It needs no re-calibration and requires,
at most, minimal training to give results that are accurate to
better than one part per million (with some samples a few parts
per hundred million). Sensitivities are in the range 0.05 –
A wide range of variations is available, depending on the specific
application, but both single and multi-sample systems and a variety
of chambers are available for testing samples from the size of
a thimble up to a pallet load and beyond.
As well as manufacturing
the instruments, Versaperm also offers a water vapour permeability
laboratory service for companies that need to test samples on
an irregular basis.
send any sales enquiries to Christopher Roberts, Versaperm Limited
10 Rawcliffe House, Howarth Road, Maidenhead, Berkshire, SL6 1AP, UK , tel: +44 1628 777668
further Press Information please contact Gerry Palmer @ the Palmer
& Rose Partnership. Tel 01494 637499, fax 0871 9003898, e.mail