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Please send all samples as URGENT DELIVERY to GunnLab as we will be CLOSED during the following days:
CLOSED 23th December onwards.
Reopening between 5th-9th January for URGENT CALLS AND SERVICES only
AND CLOSED between 10th-18th January. We'll reopen on 19th Jan and resume normal operations.
We appreciate your support, extend good wishes to our valued customers, and look forward to your business in 2026.
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.
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.
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Usual Units: cm³/m².day for films or cm³ /day for packages.
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Test Instruments: Mocon Ox-Tran 2/22.
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Test temperature and humidity vary to suit end-use application.
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Common conditions are 23°C, 0% Relative Humidity (dry), 50% RH, 75% RH, or others.
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Application: Plastic films, sheets, whole packages, bottles, tubs, trays, taps, foils, coated materials (including coated paper), 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.
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: Mocon Permatran W3/31 & W3/34 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:-
films are 38°C, 90% Relative Humidity or 100% RH,
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paper-based samples 23°C, 50% RH,
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packages are 23°C, 100% RH.
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Application: Plastic films, sheets, laminates, whole packages, bottles, trays, foils, coated materials, construction industry membrane materials, etc.