1. VAC SERIES GAS PERMEABILITY TESTER

3. WORKING PRINCIPLE Mount the specimen between two sealed chambers whose pressure are different. The gas molecule will pass through the film from the higher side to the lower side under the function of pressure difference (gas concentration difference). Detect the pressure change of the lower side to get the transmission rate.

4. TESTING ITEMS The packaging materials’ gas transmission rate, permeability coefficient, diffusion coefficient, and solubility coefficient are the determinant parameters for its barrier properties. And they are effected by condition (temperature and humidity).

5. EXPLANATION OF THE TESTING ITEMS Gas transmission rate is the volume of gas which, under steady conditions, crosses unit area of the sample in unit time under unit pressure difference and at constant temperature. This volume is expressed at standard temperature and pressure. The reliability of the tested GTR depends on the evenness of the specimen thickness. The rate is usually expressed in cubic centimeters under standard atmospheric pressure per square meter 24h under a pressure difference of 1atm ( cm3/m2.d.atm ). Permeability coefficient is gas transmission rate at per unit thickness . This data is independent with materials’ thickness. It expresses the materials’ essential property. Diffusion coefficient represents molecular transmission capacity through film because of thermal motion of molecular chain. In one words, diffusion coefficient express the moving speed inside the film . Solubility coefficient expresses the speed of the gas molecule absorbed and pass through the surface of material.

6. TECHNICAL INDEX Model VAC-V3 VAC-V2 VAC-V1 No. of chamber 6 (independent) 3 (independent) 1 Automatic level Full Full Full Test range (cm3/m2.24h.0.1MPa) 0.10~50,000 (normal volume for group A); 1.00 ～ 500,000 (extension volume for group A); 0.01 ～ 1,000 (group B) 0.05 ～ 50,000 (normal) upper limit ≥500,000 ( extension volume ) 0.1~100,000 (normal volume) upper limit ≥600,000 (extension volume) Temperature control Range (℃) 5 ～ 95 5 ～ 95 RT ~ 50 Temperature control accuracy (℃) ±0.1 ±0.1 ±0.1 Vacuum resolution (Pa) 0.1; 0.01 0.1 0.1 Vacuum degree (Pa) <20 <20 <20

11. SKETCH OF THE CONNECTION (TAKE V2 AS AN EXAMPLE) 01 gas tank, 02 vacuum pump, 03 temperature controller, 04 mainframe, 05 computer (optional)

12. FUNCTION OF THE SOFTWARE (TAKE V2 AS AN EXAMPLE)

13. FUNCTION OF THE SOFTWARE (TAKE V2 AS AN EXAMPLE)

14. “ DATA-CURVE-FITTING” can obtain various permeability data of the same kind of material with different thickness at various temperatures, based on the test results that are easily obtained under normal conditions. On the one side, this function makes impossible test a reality and reduces test costs simultaneously. On the other hand, it greatly improves test efficiency and forms reliable basis to scientific research and production. This is a total new technique, and we have given speech about this technique through the 16th IAPRI conference. FUNCTION OF THE SOFTWARE (TAKE V2 AS AN EXAMPLE)

15. VAC’s DEVELOPMENT ITEM ISO 2556, ISO 15105-1 Labthink Volume adjustment Manual Computer Vacuum capacity of pump ≤ 10Pa Better than 0.1Pa, world famous brand Vacuum degree ≤ 27Pa Generally be ≤ 20Pa Sensor Resolution 6Pa Resolution 0.1Pa, world famous brand

16. VAC vs OTHER SIMILAR TESTERS Country Latest model’s test range Volume Adjustment Resolution of Sensor Vacuum degree Japan 0.876-876cm3/m2·24h·0.1MPa N/A 6Pa ≤ 27Pa Germany 0.5-30,000 cm3/m2·24h·0.1MPa N/A 6Pa ≤ 27Pa Denmark 1-10,000cm3/m2·24h·0.1MPa N/A 6Pa ≤ 27Pa Labthink Model: VAC-V2 0.05‌ ～‌ 50,000cm 3 /m 2 ·24h·0.1MPa （ normal ） Upper limit is not less than ‌500,000‌cm 3 /m 2 ·24h·0.1MPa‌ （ extension volume ） Full automatic 0.1Pa ≤ 20Pa