The principle of volatile corrosion inhibition is by using VCI, volatile corrosion inhibitor which can be evaporated under normal temperature so as to achieve saturation in the closed environment; VCI molecules are absorbed onto the metal surface to form a transparent protection film of several molecules thick after complicated physical and chemical reactions. This transparent protection layer is water proof, difficult to be dissolved and thus, can stop further corrosion. Evaporated VCI molecules can reach anywhere in the package with best anti-rust performance. VCI plastic material is manufactured by polyolefin resin with VCI under processes.

Volatile corrosion inhibiting film testing should adopt US military specification MII.PRF-22019D “Barrier Materials, Transparent, Flexible, Sealable, Volatile Corrosion Inhibitor Treated” and other domestic and international standards.

1.VCI Thickness Testing

Whether the thickness of VCI plastic film is even or not is the basic for VCI film and its performances. Uneven thickness would affect the tensile strength, permeation of different parts of the package; and would affect the following processing. Thickness testing methods are varied. For VCI plastic film thickness measurement, ISO 4593 and GB/T 6672-2001 are applicable.

Labthink PARAM CHY-C2 and CHY-CA Thickness Testers are both high precision thickness testers for VCI plastic film thickness testing with the resolution upto 0.1um. Labthink PARAM CHY-CA Thickness Tester, besides its high precision, high efficiency and other characteristics and functions to similar PARAM CHY-C2, is equipped with automatic feeding system to satisfy the constant and effective testing requirements of the clients with greater testing efficiency.

2. VCI Plastic Film Impact Testing Instruments

VCI (Volatile Corrosion Inhibition) plastic film impact property and its control could avoid package breakage owing to the insufficient toughness, so as to effectively get rid of product rustiness caused by inferior impact or shock resistance of the VCI plastic packages during circulation.

VCI plastic film impact testing is in compliance with ASTM D3420, GB/T 8809-1958 and other international standards. Labthink PARAM FIT-01 Film Impact Tester is in strict compliance with these standards and with more advanced functions. For example, Labthink PARAM FIT-01 Film Impact Tester is of pneumatic specimen clamping and pneumatic pendulum releasing, which is completely different from other products that are manual clamping. Pneumatic clamping is rapid and effective with even clamping force on the four sides of the film, and will not slide during impact with inaccurate results. Besides, the precision of PARAM FIT-01 Film Impact Tester is up to 0.001J, whereas other impact testers are mostly of mechanical type with low precision through reading the graduation on the board.

3. VCI Plastic Film Tear Resistance Testing

The VCI (Volatile Corrosion Inhibition) packaging material may be torn by exterior forces during storage and transportation. Sufficient tear resistance can reduce the transmission of tear and avoid rusting caused by leakage. The testing for tear performances of VCI packaging material is of Elmendorf method; and Labthink PARAM SLY-S1 Tearing Tester can be applied for this test. This tester is computer control, display and horizontal adjustment that guarantees reliable and accurate testing results; the unique ‘3-ring’analysis technology can help the operators with more direct analysis and evaluation.

4. VCI Seal Performance Testing

VCI (Volatile Corrosion Inhibition) packages, owing to strict requirements, its seal performance testing is quite important. Seal performance is defined as the characteristic of avoiding alien substance entering into or contents coming out of the package. Usual testing methods are as follows:

4.1 Underwater Decompression Method:

Labthink PARAM MFY-01 Leak Tester is on underwater decompression method according to GB/T 15171-94 Test Method for Leaks in Sealed Flexible Packages. Put a certain amount of distilled water into the vacuum chamber, and put the sealed vacuum container into the distilled water completely. Then, set the testing pressure and testing time. Usually, the vacuum degrees are 20, 30, 50 and 90 kPa, etc. Start testing. When the leak tester has reached a certain vacuum degree, stop vacuumizing and observe. The inner-out pressure difference of the specimen will cause inferior quality specimen leak so as to test leakage.

4.2 Pressured Testing Method

Labthink PARAM LSSD-01 Leak and Seal Strength Detector is of pressured testing method. Imposing high pressure gas into the vacuum container and test the pressure resistance, sealing degree and leak indexes so as to test integration and seal performance of the vacuum container.

Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.

5. Barrier property testing

Barrier property is defined as the barrier performance of packaging material against liquid or gas permeable substances. The entry of oxygen would greatly increase the possibility of oxidization of metal contents, and the water vapor barrier property is of even more importance.

For gas barrier property, Labthink introduces PERME VAC series Gas Permeability Testers and Labthink PERME OX2/230 Oxygen Transmission Rate Test System that comply with relevant ASTM, ISO or GB standards (such as GB 1038 and GB 1037). For water vapor barrier property testing, Labthink PERME TSY-T series Water Vapor Permeability Testers and Labthink PERME W3/330 Water Vapor Transmission Rate Test System are applicable.

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FAX: 0086-531-85062108
EMAIL: trade2@labthink.cn
SKYPE: shirley-labthink
MSN: shirleywu_labthink@hotmail.com

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