Meter puts seals to the test

The Versaperm WVTR (water vapour transmission) meter offers a quick and simple way to test materials, seals and finished enclosures.

Seals, gaskets, O-rings, enclosures and mastics may form a good barrier to water, oil and petroleum, but often let vapour to pass straight through - effectively invalidating their use.

Not only can they be highly sensitive to changes in pressure, temperature and other conditions, but even over-tightening can allow vapour to pass more easily through.

Now Versaperm has introduced a quick and simple way to test the materials, the seals and the finished enclosures.

A simple programme of testing is often all that is needed to ensure that the right seals are used in any application.

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 less accurate.

The company also offers a water vapour permeability laboratory service for companies that need to test samples on an irregular basis.

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 recalibration and requires, at most, minimal training to give results that are accurate to better than 1ppm (with some samples a few parts per hundred million).

Sensitivities are in the range 0.05-3200g/m2/d.

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.

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