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GAS TRANSMISSION - PERMEABILITY

Oxygen Transmission Rate - OTR

The transmission (or permeation) of oxygen gas through packaging materials has a major affect on the package shelf life.

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Oxygen gas is passed over one side of the sample, while nitrogen flows over the other side; then out to a  Mocon coulometric sensor. The sensor measures oxygen permeating through the sample which appears in the nitrogen stream.

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  • ASTM Methods:  F1927, D3985, or F1307. 

  • Usual Units: cm³/m².day for films or cm³ /day for packages.

  • Test Instruments:  Four Mocon Ox-Tran 2/21 modules.

  • Test temperature and humidity vary to suit end-use application.

  • Common conditions are 23°C, 0% Relative Humidity (dry), or 75% RH, or others.

  • Application:  Plastic films, sheets, whole packages, bottles, tubs, trays, taps, foils, coated materials etc.

Water Vapour Transmission Rate - WVTR, MVTR

The transmission (or permeation) of water vapour through barrier materials causes unwanted absorption of moisture into items like dry foods, pharmaceuticals, building materials.

 

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Water vapour transmitted through the sample is measured by a Mocon modulated infra-red detector.

ASTM Method: ASTM F1249, usual Units: g/m².day for films or g/day for packages.

Test Instruments: Three Mocon Permatran W3/31-3/33 modules.

We also use gravimetric methods including ASTM E96, and some USP methods.

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  • Test temperature and humidity vary to suit end-use application. Common conditions for films are 38°C, 90% Relative Humidity or 100% RH. Common conditions for packages are 23°C, 100% RH.
     

  • Application:  Plastic films, sheets, laminates, whole packages, bottles, trays, foils, coated materials, construction industry membrane materials, etc.

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