Testing method for the determination of methane transmission rate through plastic films.

Result Unit:

• Gas permeability in cm³/(m²*d*bar); Permeability coefficient (based on the thickness) in cm³*mm/(m²*d*bar).
• Declaration of cm³ at normal condition according to DIN 1343: volume of the gas at 273.15 K (0 °C) and 101325 Pa (1 atm).

(Related) Standards:

• DIN 53380-2,
• DIN 53380-3,
• DIN 53380-4: Methods for the determination of gas permeability,
• ISO 1399:1983: Testing of rubber, determination of gas permeability, test with constant volume,
• ISO 2872:1977: Testing of rubber, determination of gas permeability, test with constant pressure.

Test method:

The test sample is mounted in a permeation cell so as to form the barrier between two chambers.

One chamber is filled with the test gas until test pressure is reached. After reaching the desired temperature, the measurement is started.

The permeation gas displaces liquid out of a U-tube which is connected with the other chamber. The permeation coefficient is calculated as the slope of the displaced volume against time.

Detection limit:
Range of the norm: approx. 3 to 20000 cm³/(m²*d*bar). Please contact us if you have differing requirements.

Required specimen:

For testing please send us a sample of the approximate size of a sheet of paper (DIN A4, 210*297 mm).

For non flat specimens: please contact us.

The sample size is not regulated by the norm, 100 mm in diameter are proposed.

The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds. On request we measure your sample thickness according to DIN 53370.

We recommend the measurement of three independent samples per test (minimum number not regulated in the standard). Our standard is to measure samples of 20 µm – 3 mm, others on request.

Required sample dimension: we perform the preparation of the samples for you.

For different test gases and type of samples we use different sized samples. If you want to conduct the cutting of the specimens please contact us for the required dimensions.

For sensistive coating test sometimes it makes sense to prepare first the support followed by the coating. Please inform us, if your samples tend to mechanical failure under applied pressure (of the test gas or the sealings).

Testing medium:

Methane >99,5 %, dry.

Our permeation measurement cells are all-purpose because they are resistant to corrosion.

Please contact us for special applications. The testing method is normally limited to substances or mixtures which contain substances with strongly skewing permeation rates.

Test conditions:

Scope of the standard: 23 °C +/- 1°C dry gas, ambient pressure on the feed side.

Mecadi’s possible testing temperatures:

• Standard -50 °C up to +150 °C, other temperatures on request.

Temperature tolerance possible with Mecadi equipment: better than +/- 0.1 K (target: +/- 0.01 K).

Experience shows that +/- 1 K tolerance leads to permeation rate scattering up to 20 %.

Mecadi’s possible testing pressures:

• Standard: Until 100 bar, others on request.

Please contact us for information about special effects and requirements for the samples at high pressures.
Also possible are temperature profiles (nonisothermic measurements) for the determination of morphology changes and the influence of media and pressure to polymer properties. Based on this method, Mecadi offers further examination to determine gas solubilities (sorption and desorption), diffusion coefficients and the measurement of break through times through barriers.

Furthermore interactions between media and polymer can be investigated. So the predictions according resistance, physical and chemical reactions under process conditions can help in the selection process of materials.

For safety reasons Mecadi does not conduct the detection of the the permeate with a mercury filled u-tube (scope of the standard) but an electronic pressure transducer (constant volume). Please contact us if you need standard conform detection.

You find this article here as a PDF. We also do the test sample manufacture for you.

Der Beitrag Methane permeability (volumetric) according to DIN 53380-1 / DIN 53380-V erschien zuerst auf Permeation & Polymers.

Testing method for determining methane transmission rate through flat plastic materials like films, sheetings, laminates, co-extruded or coated materials under a differential pressure.

Result Unit:

• GTR (gas transmission rate) mol/ m²*s*Pa
• Usally: cm³ (STP)/ m² * 24 h STP according DIN 1343: the volume of the gas at 273.15 K (0°C) and 101325 Pa (1 atm)
• Normalised to thickness: P(permeability) mol*m/m²*s*Pa
• Usally: cm³*mm/m²*24 h* atm

(Related) Standards:

ISO 15105

Test method:

The test sample is mounted in a permeation cell so as to form the barrier between two chambers. Both chambers are evacuated. Afterwards, one chamber is filled with the testing gas.

In the other chamber, the pressure increases because of the transmission through the specimen. The permeation rate is calculated based on the pressure increase.

Detection limit: 0.01 cm³/m²*day
The detection limit also depends on the nature and thickness of the specimen.
The method is recommended for permeation values > 0.1 cm³/m²*day, because at lower rates the measurement times become very long and costs for the measurement rise. At very low permeation rates, measurement with increased partial pressure difference are recommended to shorten measurement times.

Required specimen:

For testing please send us an sample of the approximate size of a sheet of paper (DIN A4, 210*297 mm).

Scope of the standard: 10 – 150 mm active diameter of the samples.

The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds. On request we measure your sample thickness according to ISO 4593.

We recommend the measurement of three independent samples per test. Our standard is to measure samples of 20 µm – 3 mm, others on request.

Required sample dimension: we perform the preparation of the samples for you.

For different test gases and types of samples we use different sized samples. If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions. For sensitive coating test it sometimes makes sense to prepare first the support followed by the coating. Please inform us, if your samples tend to crack under applied pressure (of the test gas or the sealings).

Testing medium:

Methane > 99,5 %, dry.

Our permeation measurement cells are all-purpose because they are resistant to corrosion. Please contact us for special applications.

The testing method is normally limited to substances or mixtures which contain substances of strongly skewing permeation rates.

Test conditions:

Scope of the standard: 23 °C +/- 2°C gas at ambient pressure (partial pressure difference about 1 atm absolute)

Mecadi’s possible testing temperatures:

• Standard -50 °C up to +150 °C, other temperatures on request (-190°C up to 600 °C possible, requires set-up time)

Mecadi’s possible testing pressures:

• Standard: up to 100 bar, others on request.

Please contact us for information on special effects and requirements for the samples at high pressures.

Also possible are temperature profiles (nonisothermic measurements) for determining the glass transistion temperatures and the influence of media and pressure to polymer properties.

Based on this method Mecadi offers further examination to determine gas solubilities (sorption and desorption), diffusion coefficients and the measurement of break through times through barriers.

Furthermore interactions between media and polymer can be investigated. So the predictions according resitance, physical and chemical reactions under process conditions can help in the selection process of materials.

You find this article here as a PDF. We also do the test sample manufacture for you.

Der Beitrag Methane permeability (manometric) according to ISO 15105 erschien zuerst auf Permeation & Polymers.

Der Beitrag Methane permeability according to in-house method erschien zuerst auf Permeation & Polymers.

Testing method for the determination of methane transmission rate through plastic films or other materials.

Result Unit:

• Gas permeability in cm³/(m²*d*bar);
• based on the thickness: permeability coefficient in cm³*mm/(m²*d*bar).
• Declaration of cm³ at normal condition according to DIN 1343: volume of the gas at 273.15 K (0 °C) and 101325 Pa (1 atm).
• Permeability in cm³/(d*bar).
• Length related oxygen permeability in cm³/(m*d*bar) for tubes. Declaration of cm³ at normal condition according to DIN 1343: volume of the gas at 273.15 K (0 °C) and 101325 Pa (1 atm).

(Related) Standards:

• DIN 53380-1,
• DIN 53380-3,
• DIN 53380-4,
• ISO 1399:1983: Testing of rubber, determination of gas permeability, test with constant volume,
• ISO 2872:1977: Testing of rubber, determination of gas permeability, test with constant pressure.

Test method:

The test sample is mounted in a permeation cell so as to form the barrier between two chambers.

One chamber is filled with the test gas until test pressure is reached. After reaching the desired temperature, the measurement is started. The rising pressure of the permeated gas in the second chamber is measured by electronic sensors.

Detection limit:
Range of the norm: approx. 0.5 to 20000 cm³/(m²*d*bar). Please contact us if you have different requirements.

Required specimen:

For testing, please send us a sample of the approximate size of a sheet of paper (DIN A4, 210*297 mm).

For non flat specimens: please contact us.

Proposed by the norm: 70 cm² active area of the samples.

The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds. On request we measure your sample thickness according to DIN 53534.

We recommend the measurement of three independent samples per test (minimum number not regulated by the standard). Our standard is to measure samples of 20 µm – 3 mm, others on request.

Required sample dimension: we perform the preparation of the samples for you.

For different test gases and type of samples we use appropriately sized samples.

If you want to conduct the cutting of the specimens please contact us for the required dimensions.
For sensistive coating test sometimes it makes sense to prepare first the support followed by the coating.
Please inform us if your samples tend to mechanical failure under applied pressure (of the test gas or the sealings).

Testing medium:

Methane > 99,5 %, dry.

Our permeation measurement cells are nearly all-purpose because they are resistant to corrosion.

Please contact us for special applications. The testing method is normally restricted to substances or mixtures which contain substances with strongly skewing permeation rates.

Test conditions:

• Scope of the standard: 10 °C – 40 °C.
• Gas pressure: not regulated by the standard.

Mecadi’s possible testing temperatures:

• Standard -50 °C up to +150 °C, other temperatures on request.

Temperature tolerance possible with Mecadi equipment: better than +/- 0.1 K (target: +/- 0.01 K)
Experience shows that +/- 1 K tolerance leads to permeation rate scattering up to 20 %.

Mecadi’s possible testing pressures:

• Standard: until 100 bar, others on request.

Please contact us for information on special effects and requirements for the samples at high pressures.

Also possible are temperature profiles (nonisothermic measurements) for the determination of morphology changes and the influence of media and pressure on polymer properties. Based on this method, Mecadi offers further examination to determine gas solubilities (sorption and desorption), diffusion coefficients and the measurement of break through times through barriers.

Furthermore, interactions between media and polymer can be investigated. Thus the predictions according resitance, physical and chemical reactions under process conditions can help in the selection process of materials.

You find this article here as a PDF. We also do the test sample manufacture for you.

Der Beitrag Methane permeability (plastic films manometric) according to DIN 53380-2 / DIN 53380-M erschien zuerst auf Permeation & Polymers.