Product category:
Humidity and moisture sensing systems
News Release from: Versaperm | Subject: Versaperm WVTR
Edited by the Processingtalk Editorial
Team on 22 February 2008
Watertight seals and bearings let in
water!
Sealing materials are virtually impervious to liquid water - but allow vapour to flow straight through almost unhindered: measure the vapour permeability of your seal to identify potential problems
Seals, mastics, adhesives, gaskets, O-rings and enclosures might be waterproof - but most still let in water! A huge number of materials are virtually impervious to liquid water - but allow water vapour to flow straight through almost unhindered Vapour is extraordinarily invasive and the problems it causes can only be eliminated by measuring the permeability
This article was originally published on Processingtalk on 7 May 2004 at 8.00am (UK)
Related stories
Water vapour permeability testing
Seals, gaskets, O-rings, enclosures and mastics can be highly sensitive to changes in pressure, temperature and other conditions: many allow water vapour to pass straight through!
Water vapour is omnipresent and insidious
Water vapour is invasive and the wastage it causes costs UK businesses hundreds of millions of pounds each year: O rings, seals and enclosures that keep water out, don't stop water vapour
The Versaperm WVTR, (Water Vapour Transmission), meter has been purpose designed for this task, and can even measure how vapour permeability varies with temperature, pressure and other conditions.
The WVTR meter copes with several samples, seals or enclosures at a time, often giving readings in as little as 30 minutes - whereas conventional gravimetric measurement takes several days and is significantly less accurate.
The meter is easy to use and produces precise, accurate and repeatable results.
It needs no re-calibration and requires, at most, minimal training to give results that can be accurate to better than one part per million (with some samples a few parts per hundred million).
Sensitivities are in the range 0.05 - 3200g/m2/day.
A variety of chambers are available for testing samples from the size of a thimble up to a pallet load and beyond.
Variations that measure the permeability / diffusion rate in relation to other gases, such as Oxygen, CO2 and petrochemicals are also available.
Versaperm offers a laboratory measurement service for companies that only need to test samples on an irregular basis.
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