DM2/330 Differential and Equal Pressure Method Gas Permeability Tester is based on differential and equal pressure method, and is professionally applicable to the gas permeability test of films and packages. It is designed for tests of gas transmission rate, solubility coefficient, diffusion coefficient and permeability coefficient of plastic films, laminated films, high barrier material, sheets, aluminum foils and back-sheets as well as bottles, pouches, jars and boxes made of plastics, rubber, paper, glass, metal and other materials.
Technical Specifications
1.Equal Pressure Method| Specifications | Film Test | Package Test (customization available) |
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| Test Range | 0.01~5000 cm3/m2·d (Standard) | 0.0001~50 cm3/pkg·d (Standard) |
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| Resolution | 0.001 cm3/m2·d | 0.00001 cm3/pkg·d |
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| Test Gas | O2, Air and other gases (outside of supply scope) |
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| Specimen Size | / | 100% O2 Test: < Ф90 mm, Height should be less than 280 mm |
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No size limitation for Open (Air) Test |
| Number of Specimen | 3 (with independent test results) |
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| Specimen Specification | / | Bottle: inner diameter of bottle mouth should be more than Ф9 mm, outer diameter of bottle mouth should be less than Ф50 mm (Standard) |
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Bag and Box: Testing accessories are required |
2. Differential Pressure Method| Test Range | 0.05 ~ 50000 cm3/m2·24h·0.1MPa (Standard) |
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| Vacuum Resolution | 0.1 Pa |
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| Vacuum Degree of Test Chamber | <20 Pa |
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| Test Gas | O2, N2, CO2, etc. (outside of supply scope) |
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| Gas Supply Pressure | -0.1MPa ~ +0.1MPa (Standard) |
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| Number of Specimen | 3 (with independent test results) |
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| Test Area | 38.48 cm2 |
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3. Other Specifications| Temperature Range | 5°C ~ 95°C |
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| Temperature Accuracy | ±0.1°C |
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| Pressure of Test Gas | 0.6 MPa |
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| Port Size | Ф8 mm PU Tubing |
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| Carrier Gas | 99.999% high purified nitrogen (outside of supply scope) |
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| Pressure of Carrier Gas | 0.05 MPa |
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| Port Size | 1/8 inch copper tubing |
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| Instrument Dimension | 1080 mm (L) X 720 mm (W) X 490 mm (H) |
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| Power Supply | AC 220V 50Hz |
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| Net Weight | 120 kg |
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Principle
Unique patent design; one tester can perform tests using both differential and equal pressure methods.
1. Equal Pressure Method: Clamp the pre-conditioned specimen between the upper and the lower chambers. High pure oxygen or air flows in one side of the film (upper chamber); while high pure nitrogen flows in the other side of the film (lower chamber). Oxygen molecule passes through the film into the high pure nitrogen side (lower chamber), and is taken to the sensor by the flowing nitrogen. By analyzing the concentration of oxygen detected by the sensor, the oxygen transmission rate and other parameters can be obtained. For packages, nitrogen flows inside the package, and air or high pure oxygen flows outside.
2. Differential Method: Clamp the pre-conditioned specimen between the upper chamber and the lower chamber. Evacuate the low-pressure chamber (lower chamber) and then the whole system. When the specified degree of vacuum is reached, shut off the lower test chamber and feed test gas of certain pressure to the high pressure chamber (upper test chamber). Ensure that a constant differential pressure (adjustable) is maintained between the two sides of the specimen. Thus, under the function of pressure gradient, the test gas permeates from the high-pressure side to the low-pressure side. By monitoring the pressure changes in lower chamber, various barrier parameters can be obtained.
3. Double Method: Clamp the preconditioned specimen between the upper and lower chambers. Equal pressure method test proceeds first; and then, the differential method.
Standards
This test instrument conforms to the following standards:
ISO 15105-1, ISO 15105-2, ISO 2556, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, ASTM D1434, JIS K7126-1, JIS K7126-2, YBB 00082003, GB/T 19789, GB/T 1038
This test instrument is applicable to the determination of gas permeability of:
| Basic Applications | Films
Including plastic films, plastic composite films, paper-plastic composite films, coextruded films, aluminized films, aluminum foils, aluminum foil composite films and many others |
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Sheeting
Including engineering plastics, rubber and building materials, e.g. PP, PVC and PVDC |
Packages
Including plastics, rubber, paper, paper-plastic composite, glass, and metal packages, e.g. Coke bottles, peanut oil packages, Tetra Pak materials, vacuum bags, metal three-piece cans, soft tube packages for cosmetic and toothepaste, and jelly cups |
| Extended Applications | Package Caps
Test seal performance of different package caps |
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Solar Back-Sheets
Including solar back-sheets |
Plastic Pipes
Including various sorts of pipes, e.g. PPR |
Blister Packs
Test gas transmission rate of the whole blister packs |
Fuel Tanks of Cars
Plastic fuel tanks are widely used in cars for its light weight, buffering vibration and easy molding characters. But its fuel permeability is the most essential factor. This instrument can be used to test permeability of plastic fuel tanks |
Battery Plastic Shell
Battery electrolyte is protected by the plastic shell from outside environment. Battery service life is directly depended on its gas permeability. This instrument can be used to test gas transmission rate of battery plastic shell |
Biodegradable Films
Test gas permeability of various sorts of biodegradable films, e.g. starch-based packaging films |
Paper and Paper Board
Including paper and paper board, e.g. aluminum foil paper for cigarette packages and Tetra Pak materials |
Paint Films
Test gas permeability of various sorts of paint films |
Contact Lenses
Test oxygen permeability of contact lenses |
Flexible Plastic Infusion Bottles
Test oxygen permeability of flexible plastic infusion bottles |
Red Wine Bottles
Test oxygen permeability of red wine bottles |
Warm Paste Packaging Bags
Test oxygen permeability of the packaging bags of warm pastes |
Various Gases
Test the permeability of various types of gases, e.g. O2, CO2, N2, Air and He |
Inflammable, Explosive Gases
Test the permeability of inflammable and explosive gases |
Materials for Aerospace Usage
This instrument can test the Helium permeability of airship gas bags |
Glass Fiber Cloth and Paper
Including glass fiber cloth and paper materials, e.g. Teflon paint cloth, Teflon welding cloth, and Teflon silicon rubber cloth |
Soft Tube Materials for Cosmetics
Including various types of cosmetic tubes, aluminum-plastic tubes and toothpaste tubes |
Rubber Sheeting
Including various sorts of rubber sheeting, e.g. car tires |