1Testing principle of GTR-3A plastic composite film permeameter:
Using the principle of differential pressure testing, the pre processed sample is placed between the upper and lower testing chambers and clamped. Firstly, perform vacuum treatment on the low-pressure chamber (lower chamber), and then evacuate the entire system; After reaching the specified vacuum degree, close the lower chamber of the test, fill the high-pressure chamber (upper chamber) with a certain pressure of test gas, and ensure that a constant pressure difference (adjustable) is formed on both sides of the sample; In this way, the gas will permeate from the high-pressure side to the low-pressure side under the action of the pressure gradient. By monitoring and processing the pressure inside the low-pressure side, various barrier parameters of the tested sample can be obtained

2、 Technical indicators:
Measurement range: 0.3~10000 cm3/(m2 • 24h • 0.1Mpa)
Resolution: 0.01 cm3/(m2 • 24h • 0.1Mpa)
Temperature range: 5 ℃~90 ℃
Temperature control accuracy: ± 0.01 ℃
Vacuum resolution: 0.1Pa
Test chamber vacuum degree:< 10pa
Test pressure: 0~200KPa
Test gases: O2, CO2, N2, etc
Sample thickness: ≤ 2mm
Joint size: 10mm
Gas source pressure: 0.2-0.8MPa
Sample size: Φ70mm ， Through an area of 38.48cm2
Testeable quantity: 3 pieces (expandable to multiple pieces)
Number of sensors: 3
Weight: 60kg
Power: 1000W
Power supply: 220V AC, 50HZ
Dimensions: 800mm × 560mm × 400mm
3、 Standard:

GTR-3APlastic composite film permeameterMeet multiple countries and standards:
ISO 15105-1、ISO 2556、GB/T1038-2000、ASTM D1434、JIS K7126-1
4、 Application
GTR-3AExtended application:
Multiple different gases: suitable for permeability testing of various gases, such as oxygen, carbon dioxide, nitrogen, air, helium, etc
Flammable and explosive gases: suitable for testing the barrier performance of various films against flammable and explosive gases
Biodegradable film: used to test the breathability of biodegradable films, such as starch biodegradable bags, etc
Aerospace materials: used for gas permeability testing of aerospace materials, such as helium permeability testing of airship airbags
Paper and cardboard: used for breathability testing of composite materials such as paper and paper plastic, such as cigarette packaging aluminum foil, Tetra Pak packaging sheet, instant noodle paper bowls, disposable paper cups, etc
Paint film: Used for testing the breathability of paint films applied to substrates
Fiberglass cloth, fiberglass paper and other materials: suitable for breathability testing of fiberglass cloth, fiberglass paper and other materials, such as PTFE paint cloth, PTFE high-temperature cloth, fluorosilicone adhesive cloth, etc
Cosmetic hose sheet: suitable for gas permeability testing of various cosmetic hoses, aluminum-plastic tubes, and toothpaste tube sheets
Various rubber sheets: suitable for air permeability testing of various rubber sheets, such as air permeability testing of car tires