This is a bi-annual service; samples of film are prepared every six months at Smithers Pira and sent to each subscriber in April and October, accompanied by a statistical analysis report of the previous round results.
For each round and test condition, two different types of film are provided, to give two levels of permeability. Subscribers can choose to take samples for water vapour and/or Oxygen Permeability. For WVTR, two conditions are available: 25°C, 75% rh. and 38°C, 90% rh. and again you can choose one or the other or both. Samples are identified by film number and an indicative value that enables an immediate check on results.
If you wish to participate in the service please complete and return the Permeability Proficiency Service application form (below).