Vapour meter
March 1st 2008

Seals, mastics, adhesives, gaskets, O-rings and enclosures might be waterproof but, according to Versaperm, most still let in water vapour. The company says that while a huge number of materials are virtually impervious to liquid water, they allow water vapour to flow straight through almost unhindered. Vapour is invasive and to eliminate the problems it causes, it is necessary to measure the permeability.

The Versaperm WTR (Water Vapour Transmission)meter has been designed for this task, and can measure how vapour permeability varies with temperature, pressure and other conditions. It copes with several samples, seals or enclosures at a time, often giving readings in as little as 30min.