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What is Gas Transmission Rate Tester & Water Vapour Transmission Rate Tester?

What is Gas Transmission Rate Tester & Water Vapour Transmission Rate Tester?

Gas permeability and water vapor permeability are important characteristic values of materials used for packaging and sealing materials such as plastic films and rubber sheets, and the differential pressure method and isobaric pressure method are specified as measurement methods.

In the differential pressure method, the upper side of the sample is filled with the measurement gas and the lower side of the sample is evacuated, and the amount of permeation is measured by the pressure increase of the permeated measurement gas.

 

1．Gas Transmission Rate Tester

Gas Transmission Rate Tester, CT3

 

1.1 Differential pressure method measurement

The system uses a differential pressure method with a pressure sensor to measure the permeability of various gases such as oxygen, nitrogen, and hydrogen.

By selecting an A or B pressure sensor with a different full scale according to the permeability to be measured, a wide measurement range is possible, from low permeability to high permeability, according to the sample to be measured. In addition, a high-precision pressure sensor with a reading accuracy of 0.25% is used, enabling high-precision measurement.

 

1.2 Measuring cell

The measuring cell is selectable from ∅30 or ∅70, and can be used for small samples.

The cell is temperature-controlled by a circulation tank, allowing a wide range of temperature settings from 10 to 90°C.

571_ガス透過度測定装置_2 Gas Transmission Rate Tester, CT3 measuring cells

 

1.3 Automatic measurement

Conventional devices require the troublesome operation of a manual valve during measurement. This product, however, uses an automatic valve, enabling automatic measurement from gas introduction to the end of measurement after the sample is set.

 

1.4 Pressure value correction

To minimize the effects of environmental changes and other factors, we have developed a proprietary pressure value compensation calculation to minimize the effects of temperature distribution and differential pressure changes during measurement, thereby enabling highly accurate measurement.

 

1.5 Diffusion and solubility coefficient measurements

This system also supports optional measurement of diffusion coefficient, solubility coefficient, and delay time, making it possible to measure characteristic values useful for material development as an evaluation of permeation mechanisms.

 

1.6 Main Specifications

Temperature range 10℃ to 90℃
Specimen dimensions
  • 50 × 50mm（Measuring cell ∅30mm）
  • 90 × 90mm（Measuring cell ∅70mm）
GTR measurement range

[mol/(m2・s・Pa)]
  • Type A: 4.5×10-15〜4.5×10-12
  • Type B: 4.5×10-14〜4.5×10-11
Test gas
  • Oxygen
  • Nitrogen
  • Carbon dioxide
  • Air
  • Helium
  • Hydrogen (Optional)

etc.

2．Water Vapour Transmission Rate Tester

Water Vapour Transmission Rate Tester, CT3W

 

2.1 Differential pressure method measurement

The conventional isobaric method was mainly used to measure water vapor permeability, but JIS K 7129-5 and ISO 15106-5 established a pressure sensor method using the differential pressure method. This product is a device that complies with this differential pressure method measurement.

Conventional isobaric pressure measurement devices require additional costs for consumables, sensor calibration, etc., but this device can be operated at low running costs.

The use of an automatic valve and simple operation method make it easy to introduce the system and reduce the burden on operators.

In addition, as with the gas permeability measurement system, a proprietary pressure value compensation calculation is used to minimize the effects of environmental changes and enable highly accurate measurements.

2.2 Measuring cell

The water vapor is supplied to the sample at a specified temperature and humidity by flowing air at a controlled flow rate to the water vapor generator attached to the measurement cell.

The control range is from 20 to 85°C and humidity from 80 to 90&RH to meet a wide range of measurement conditions.

572_2_水蒸気透過度測定装置セル Water Vapour Transmission Rate Tester, CT3W measuring cells

 

2.3 Main Specifications

Measurement range 20℃ to 85℃, 80%RH to 90%RH (Depends on the combination)
Specimen demensions
  • 50 × 50mm (Measuring cell ∅30mm）
  • 90 × 90mm (Measuring cell ∅70mm）
Water vapour transmission measurement range

［g/(m²･24h)］
  • Type A: 0.001 to 1.000
  • Type B: 0.01 to 100.00

This text is an addition and reorganization of the contents published in “TEST” Vol. 62 (January, 2022), a public relations magazine issued by the Japan Testing Machine Association.

  • Title: “Gas Transmission Rate Tester & Water Vapour Transmission Rate Tester”
  • Author: M. Takahara, Toyo Seiki Seisaku-sho, Ltd.
  • Magazine name: “TEST” Vol. 62 (Japan Testing Machine Association)
  • Issue Date: January, 2022

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