Water vapor permeability testing system C370H

calibrationcompressed airfor medical devices

The C370H is a gravimetric water vapor transmission rate (WVTR) test system designed for films, sheet materials and containers used in pharmaceutical packaging, food, medical devices and related sectors. It performs wide-range WVTR testing in accordance with ASTM E96 and GB/T 1037.

Product Features

• 360° air-circulating constant-temperature design for a stable test environment and uniform airflow over test dishes.
• High-precision temperature and humidity sensing and control with real-time monitoring.
• Pneumatic chamber sealing isolates the test chamber from the weighing chamber to prevent temperature/humidity effects on the balance.
• Three-dimensional centered purge design providing consistent airflow across test dishes; selectable standard air-flow rates.
• Chamber-type fog-free humidification that eliminates the need for an internal humidifier.
• High-precision electronic balance with external weight calibration, automatic zero reset, cylinder lift/rotation and intermittent weighing to reduce system error.
• 10.6" medical-grade touchscreen for independent host operation and fully automatic test execution with automatic data storage.
• Platform software for synchronous control of multiple hosts and centralized data management; built-in Ethernet for remote control and system upgrades.
• Professional computer software meeting GMP traceability requirements and multi-level permission management; electronic signature design aligned with 21 CFR Part 11 (optional).

Test Principle

• A pre-treated specimen is sealed in a test dish containing either water or desiccant and placed in the controlled test chamber.
• Under specified temperature, humidity and airflow conditions, water vapor diffuses through the specimen to the dry side.
• A high-precision balance measures weight change of the dish over time and the system calculates the specimen's WVTR and related results.

Reference Standards

• ASTM E96
• GB/T 1037
• GB/T 16928
• ASTM D1653
• ISO 2528
• TAPPI T464
• DIN 53122-1
• YBB00092003

Test Applications

• Basic Applications
  • Films: WVTR tests for plastic films, composite films, co-extruded films, metallized and aluminum-foil films, fiber-reinforced composites and related film materials.
  • Containers: WVTR tests for pharmaceutical bottles, pouches, Tetra Pak, three-piece cans, cosmetic packaging, toothpaste tubes, yogurt/jelly cups and other containers made of plastic, rubber, paper-plastic composite, glass and metal.
  • Sheet Materials: WVTR tests for PP, PVC, PVDC sheets, metal foils, rubber sheets, etc.
  • Paper & Paperboard: WVTR tests for aluminized cigarette-package paper, paper-aluminum-plastic composite sheets.
  • Textiles & Non-wovens: WVTR tests for textiles, non-woven fabrics and similar materials.
• Extended Applications
  • Building Materials: WVTR tests for geotextiles, felts, thermal-insulation felts and thick waterproof/thermal materials.
  • Sterile Wound Dressing / Medical Plaster: WVTR tests for sterile wound dressings, medical plasters and similar products.

Technical Specifications

• Model: C370H
• Test methods: Gravimetric (water method) and Desiccant method
• Test ranges (g/(m²·day)): 0.1–10,000 (Water Method) and 0.1–2,500 (Desiccant Method)
• Balance range: 220 g
• Balance resolution: 0.1 mg
• Balance repeatability: 0.3 mg
• Temperature range: 15–50 °C; fluctuation: ±0.2 °C
• Humidity range: 10–90% RH ±2%
• Test stations: 6 standard (9 available as customization)
• Specimen types: Films and containers (container accessories/customization available)
• Air flow rate: 0.02–0.3 m/s and 0.5–2.5 m/s (selectable)
• Specimen size: Ø74 mm (4.2")
• Specimen thickness: ≤3 mm (≤120 mil)
• Test area: 33 cm² standard (50 cm² optional)
• Container size (custom): ≤Ø70 mm × 180 mm
• Gas specification: Compressed air (user-supplied)
• Gas source pressure: 72.5 PSI / 500 kPa
• Port size: Ø8 mm polyurethane tube
• Host dimensions: 73 × 57 × 76 cm (H × W × D)
• Power supply: 120 VAC ±10% 60 Hz or 220 VAC ±10% 50 Hz (select one)
• Net weight: 85 kg
• Standard configuration: Host, electronic balance, air dryer (maintenance-free), pressure reducing/filter valve, 6 precision WV test dishes, disassembly tools, power cord, Ø8 mm polyurethane tube
• Optional items: GMP software and computer system, 21 CFR Part 11 compliance, air compressor (≥200 L/min), additional precision test dishes, B2260 tightening device for water vapor dishes