Gas permeability tester VAC-V2 (EX)

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Overview
VAC-V2 (EX) is a laboratory gas permeability tester using the differential-pressure method for measuring gas transmission rate, solubility coefficient, diffusion coefficient and permeability coefficient of plastic films, composite films, high-barrier materials, sheets and aluminum foils. The instrument is designed to handle common gases as well as toxic, flammable or explosive gases under variable temperature conditions.

Product Features

• Split control architecture separates mainframe and control module to improve test safety for hazardous gases.
• Certified for testing flammable, explosive and toxic gases (TUV/CE where applicable).
• Three independent test cells allow simultaneous measurement of up to three identical or different specimens.
• Simultaneous calculation of GTR (gas transmission rate), permeability, solubility and diffusion coefficients.
• Wide-range, high-precision liquid circulation temperature controller for tests from 5 °C to 95 °C (±0.1 °C accuracy).
• Two process judgment modes available: Proportional Mode and Fuzzy Mode.
• Extendable measurement range to accommodate high-transmission materials.
• Data fitting across temperatures to obtain results under extreme conditions.
• PC-controlled operation and automated test sequencing; RS232 port for data export.
• Reference film available for rapid calibration and verification of test accuracy.
• Compatibility with Lystem™ Laboratory Data Sharing System for unified result and report management.

Principle
The preconditioned sample is clamped between an upper (high-pressure) and a lower (low-pressure) test chamber. The lower chamber and system are evacuated; once the target vacuum is reached the lower chamber is closed and test gas is introduced to the upper chamber at a set pressure. A constant adjustable pressure difference is created; gas permeates from the high-pressure side to the low-pressure side and permeability parameters are derived by monitoring pressure changes in the lower chamber.

Standards
ISO 15105-1; ISO 2556; GB/T 1038-2000; ASTM D1434; JIS K7126-1; YBB 00082003

Applications
Basic Applications

• Films: plastic films, composite films, paper–plastic laminates, coextruded films, aluminized films, aluminum-foil laminates.
• Sheeting: engineering plastics, rubber sheets and building material sheets (e.g. PP, PVC, PVDC).

Extended Applications

• Various gases: O2, CO2, N2, air, H2, He and others.
• Flammable / explosive / toxic gases: controlled testing of hazardous gases.
• Biodegradable films: e.g. starch-based packaging films.
• Aerospace materials: helium permeability tests for gas bags and similar components.
• Paper and board: aluminized paper, Tetra Pak sheets, disposable food containers.
• Coated films: painted or coated substrates.
• Technical textiles and glass-fiber products: Teflon-coated fabrics, welding cloths, glass-fiber papers.
• Cosmetic tube materials: aluminum–plastic tubes, toothpaste tubes.
• Rubber sheets: e.g. tire materials.

Configurations & Notes

• Standard delivery: mainframe, thermostat controller, professional software, special sampler, vacuum grease, rapid quantitative filter paper, vacuum pump (inlet).
• Optional items: sampling blade, additional vacuum grease, vacuum pump oil, rapid quantitative filter paper.
• Note: gas inlet uses Φ6 mm PU tubing; gas supply must be provided by the user.

Technical Specifications

• Test range: 0.05 – 50,000 cm3/m2·24h·0.1MPa (standard); extended upper limit ≥ 500,000 cm3/m2·24h·0.1MPa.
• Number of specimens: 3 (independent data per cell).
• Vacuum resolution: 0.1 Pa.
• Vacuum degree of test chamber: <10 Pa.
• Temperature range: 5 °C – 95 °C. Accuracy: ±0.1 °C.
• Specimen size: Φ97 mm. Test area: 38.48 cm2 (Φ70 mm).
• Test gases: H2, O2, N2, CO2 (gas supply by user).
• Test pressure: 10 kPa – 200 kPa (standard). Gas supply pressure: 0.5 MPa – 0.6 MPa.
• Port size: Φ6 mm PU tubing.
• Instrument dimensions: 760 × 575 × 450 mm (L × W × H).
• Power supply: 220 VAC, 50 Hz.
• Net weight: 88 kg.