Testing method applicable to nearly all materials. e.g. plastic and polymer films, paper, cardboard, textiles with or without coating.

Result Unit:
WVTR (water vapour transmission rate) in g/m²*d
Related to the thickness: P(permeation coefficient) in g*mm/m²*d.

(Related) Standards:

DIN 53122-1 / DIN 53122-A,
ISO 2528:1995,
ASTM E-96.

Test method:

A testing container is filled with desiccant and its opening gets covered by the sample. It is stored in a defined climate and the permeating amount of water is detected by weighing.

Detection limit:
The norm proposes a range of 1 – 200 g/m²*d. The detection limit also depends on the nature and thickness of the specimen. With a setup differing from the standard it is possible to measure much lower permeation rates, 0.1 g/m²*d.

Required specimen:

For testing please send us a sheet of the approximate size of a sheet of paper (DIN A4, 210*297 mm). For non flat specimens: please send after consulting with us.

The standard proposes sample diameter of 9 cm and a thickness of max. 3 mm. 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 differently sized samples. If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions. For sensistive coating test, it sometimes 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:

Water or water vapour.

Test conditions:

The norm proposes the following climates:

• A – 23 °C 90 %r.h.;
• B – 38 °C 90 %r.h.;
• C – 25 °C 75 %r.h.;
• D – 23 °C 85 %r.h.;
• E – 20 °C 85 %r.h.;

We will test with other climate conditions on your 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 resistance, 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 Water vapor permeability WVTR (gravimetric) according to DIN 53122-1 / DIN 53122-A erschien zuerst auf Permeation & Polymers.

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

This method is suitable for determining resistance of protective clothings to permeation of chemicals with continuous or discontinuous contact and for determining the time lag.

Result Unit:
Permeation rate in
µg/(cm²·min) or
mg/(m²·s) or
mg/(m²·min) respetively.

(Related) Standards:

EN ISO 6529:2001

DIN EN 16523-1:2013-02 (Latest standard)

The sample is installed into a permeation cell as a barrier between the two chambers. One Chamber is flushed with the testing gas or the testing chemical. The permeated substance is absorbed (dissolved) with a suitable gathering medium and concentration is measured with an appropriate analytical method. The gathering medium flows in an open system or in a loop.

Detection limit:
Detection limits depend strongly on testing media and conditions. We will provide information in concideration of your special requirements.

Required specimen:

Samples can be made out of roll or sheet material or from complete clothings like gloves, arm protectors, aprons, caps, boots or similar objects. The samples should be representative for the material, free of defects and uniform in thickness. We determine the thickness according to DIN 53370 at your option. Testing of three independent samples each is recommended. We test samples of 20 µm – 3 mm in thickness by default, others on demand.

We prepare the samples for you, sizes differ with sample material and testing medium. Please ask for sample geometries if you want to prepare the samples by yourself. In case of sensitive coatings, it possibly makes sense to prepare the samples first and apply the coating afterwards. Please inform us if the samples tend to fail mechanically under pressure (testing media, O-ring seals).

Testing medium:

The test can be realized with any liquid or gaseous substance. The following chemicals are suggested by the norm: acetone, acetonitrile, carbon disulfide, dichloromethane, diethylamine, ethyl acetate, n-hexane, methanol, sodium hydroxide (30 %), sufuric acid (96 %), tetrahydrofuran, toluene, ammonia, chlorine, hydrogen chloride.

Please contact us for your special request.

Test conditions:

Test is conducted at ambient temperature (20 – 27 °C) and pressure by default. Possible testing conditions at Mecadi: standard -50 to +150 °C, others on demand.
Feasible temperature accuracy at Mecadi better than +/-0,1 K (experience : +/-1 K results in a difference of up to 20 % in permeability of elastomeres).
Feasible pressures at Mecadi: up to 100 bar standard, others on demand.

Talk to us about special effects and requirements on the samples at high pressures.

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

Der Beitrag Determination of resistance of protective clothing materials to permeation by liquids and gases (Protection against chemicals) according to EN ISO 6529 erschien zuerst auf Permeation & Polymers.

Testing method for determining carbon dioxide 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:

Carbon dioxide > 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 Carbon dioxide permeability (manometric) according to ISO 15105 erschien zuerst auf Permeation & Polymers.

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

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.

Der Beitrag Water vapor permeability WVTR according to ISO 15106-1 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.

From materials for which there are no test plates or films for permeation measurement, Mecadi makes the test samples itself.

Examples: adhesives, castables.

Possibilities at Mecadi:

Sample preparation of thermally or UV-curing systems
(No die casting)

What do we need?

• Approx. 20 ml (In case of 100 % solids) per pattern (Or after prior consultation)
• Data sheet of handling
• Safety Data Sheets

What do we do?

• Selection of substrate depending on the desired permeation test (preferably permeable)
• Selection of substrate chemically compatible, non-absorbent
• Pretest coatability (wettability, film formation)
• Preparation of test samples
  • Thermal curing (up to 300°C), for example, chemically crosslinking or steam systems or UV-curing
  • Also handling of 1K systems including cold storage (-18°C) possible
  • 1K/2K-Systeme processible, also more complex mixtures
  • Pretreatment: mixing, outgassing, filtering possible
  • Layer thickness: according to requirements, typically > 10µm up to several millimeters
  • On carrier or carrier-free
  • Lab coat: Coating knife, spiral coating knife, screen process, dip coating, spray, etc.
  • Optical: Thin layers < 10 µm under clean room / glovebox conditions
• Characterization
  • Inspection for defects (dye test , optical, leakage testing using gas or liquids)
  • Blanks
  • Masking

-> Use in permeation test

Costs:

Please ask for offer / project-specific according to expenditures

Materials:

• Coatings (e.g. corrosion protection coatings)
• On carrier film (e.g. packaging films, elastomers, fluoropolymers, polymeric films such as PVC, PET, polyolefins, PE-metallocenes, copolymers)
• On porous carriers (membranes)
• On inspection sheets
• Adhesives (e.g. epoxides)
• Coatings (e.g. nano- coatings)
• Silicones (e.g. 1K silicones, 2K silicones)
• Casting compound

Der Beitrag Test sample manifacture – Sample preparation for permeation measurement erschien zuerst auf Permeation & Polymers.

Please note:
Withdrawn standard

Category:
Water Vapor Permeability

Related standards:

ISO 15106-3

Please note: Complete standard sheets are made available by Beuth Verlag.

Der Beitrag DIN 53122-2 erschien zuerst auf Permeation & Polymers.