Versaperm Vapour Permeability measurement

Manometric Testing to ISO 15105-1

According to ISO-1501-1:2007 manometric testing to is "....especially suitable for the determination of the gas transmission rate of each component of a gas mixture."

The Versaperm permeability meter is especially suited to this task for almost any gas (different sensors may be used for different gases).

Testing to ISO 15105-1:1972
The basic technique employed is simple and quick:-

1. Clamp the film or sheet sample into the test chamber of the instrument
2. Evacuate both sides of sample to 10-2 millibar
3. Introduce the test gas at 1 bar on one side of sample and measure pressure change on other side.

From this it is simple to calculate flow rate through the material.

The Versaperm instrument can measure less than 1 ppm of water vapour in 100ml/min of the swept gas, (the rates for other gases depends on the specific gas under test) and this translates to very low readings of around 0.002g/m²/day. We are also techniques to enhance this sensitivity even further.

Film permeability measurementsAt the other end of the scale, the instrument can measure up to 3000 ppm water vapour. Thus, using the normal 50 cm² surface area, a maximum of 64 g/m2/day can be read, although this can be increased 3200 by utilizing a 10 cm² chamber and other devices to reduce the surface area.>

We customise each instrument to meet the range required by the customer's application.

Manometric testing is where an instrument is used for measuring the pressure of liquids and gases. The basic instrument for this is called a sphygmomanometer.

ISO 15105-1:2007
is the accepted standard for the determination of the gas-transmission rate under a differential pressure of single-layer plastic films or sheets with multi-layer structures

The standard discusses two techniques - one uses a pressure sensor, the other a gas chromatograph(to measures the amount of gas which permeates through a specific test specimen.

To download a copy of ISO 15105-1:2007 click here.