Versaperm Vapour Permeability measurement


Marine Ply and Water / Hydrocarbon Vapour Permeability
 Safety Critical Measurements

marine ply Safety Critical Measurements
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Marine plywood is widely used in the marine and boat industries due to its strength and water resistant core.  However, although resistant to liquid water, water or fuel as vapour can permeate straight through it, which can condense on the other side of the panel, or even between the panel layers.  This can cause very serious problems – including ply de-lamination, weakening and for safety-critical equipment such as electronics. The answer is Versaperm.

Traditionally this permeability is measured using the ASTM Method E96 – but this takes days or weeks to produce a single measurement. Versaperm's highly accurate vapour instrumental permeability equipment can reduce this down to as little as 30 minutes for some materials.

The Versaperm equipment uses modern instrumental and sensor techniques and it can measure the permeability both quickly and accurately under a wide range of environmental conditions.  It can also measure the vapour permeability for fuels and other hydrocarbon vapours.

The vapour permeability of marine ply not only varies depending on the type, thickness and coating used on the material but also can be 15 - 20 times higher when wet than when measured when dry.  It also varies with temperature.

Versaperm also offers a vapour permeability laboratory service for companies which only need to test samples on an irregular basis.



*    The ASTM Method E96 is based on measuring the very small change in weight of a desiccant which was placed on the far side of the marine ply to capture any moisture that passes through.

**     The figure of 15 – 20 times greater flow is generally accepted and is referenced to Ojanen, Tuomo & Kokko, E & Salonvaara, Mikael & Viitanen, H. (1997). Moisture performance of plywood wall structures. X-90.

Please send any sales enquiries to
Versaperm Ltd: 10 Rawcliffe House, Howarth Road, Maidenhead, Berkshire, SL6 1AP, UK,
e.mail: Web:
UK Tel: +44 (01628) 777668
USA Tel +011 (617) 500-8607

For Further Press Information please contact:
Gerry Palmer @ the Palmer & Rose Partnership
Tel 01494 637499