Product Brief
• Leveraging the gravimetric (weight-reduction) testing methodology-a gold standard for moisture barrier performance analysis in the materials science industry-this instrument is developed, designed, and manufactured in strict adherence to prominent global standards such as GB/T 1037 and ASTM E96. It is tailored to evaluate the water vapor transmission (WVT) characteristics of a wide array of materials and packaging solutions across key industrial sectors, including food packaging engineering, pharmaceutical primary packaging, medical device components, daily chemical product casings, and photovoltaic (PV) module encapsulants. Whether testing thin films, rigid sheets, specialty papers, finished packaging units, or related composite materials, the device delivers broad-range, high-efficiency water vapor transmission rate (WVTR) detection. This capability makes it indispensable for characterizing materials with high, medium, or low water vapor barrier properties- a critical prerequisite for safeguarding product shelf life, preserving chemical stability, and meeting stringent industry-specific quality compliance criteria.
Test Principle
• The testing procedure commences with filling a dry, contaminant-free water vapor diffusion cup with distilled water. A pre-processed test specimen (e.g., a polymer film or packaging laminate) is then used to create an airtight seal on the cup, which is subsequently placed into a precision-regulated test chamber. By precisely controlling key environmental variables-specifically ambient temperature and relative humidity (RH)-the instrument facilitates the controlled evaporation of the distilled water contained within the diffusion cup. As water vapor permeates through the test specimen, the instrument continuously monitors and logs the weight decrement of the diffusion cup over a predetermined time interval. This weight-reduction data is then computationally analyzed to derive critical performance parameters, including the material's WVTR and water vapor permeability (WVP), offering quantifiable insights into its ability to impede the ingress and egress of moisture.
Schematic Diagram of Weight-Loss Method
(Note: The schematic diagram must be attached separately based on the actual technical blueprint. It graphically depicts core elements of the gravimetric testing process, such as the water vapor diffusion pathway, test chamber internal structure, weighing sensor installation position, and specimen mounting configuration, to enable clear comprehension of the operational workflow for technicians and quality control (QC) personnel.)
Executive Standards
• The instrument complies with an extensive suite of international and national standards, ensuring seamless cross-industry applicability and adherence to regulatory mandates. These standards include GB/T 1037 (China's national standard for plastic film WVTR testing), GB/T 16928 (China's standard for packaging material moisture permeability), ASTM E96/E96M (U.S. standard for water vapor transmission of materials), ASTM D1653 (U.S. standard for plastic film and sheeting WVTR), ISO 2528 (International Organization for Standardization's standard for sheet materials), DIN 53122-1 (Germany's standard for moisture permeability of paper and board), JIS Z0208 (Japan's standard for water vapor transmission of packaging materials), and YBB 00092003 (China's pharmaceutical packaging standard for moisture resistance)-comprehensively covering requirements for sectors ranging from food safety to medical device regulatory compliance.
Technical Parameters
| Item | Technical Parameters |
|---|---|
| Test Range | 0.1~10000 g/(m²·24h) (encompasses WVTR requirements for the majority of high, medium, and low barrier materials used in packaging and electronics) |
| Resolution | 0.0001 g/(m²·24h) (enables ultra-sensitive detection of minimal moisture transmission, a critical requirement for pharmaceutical blister films and PV encapsulants) |
| Temperature Control Range | 15～55℃ (supports both industry-standard testing conditions and customized environmental simulations for specialized material evaluation) |
| Temperature Control Accuracy | ±0.1℃ (maintains consistent thermal conditions to eliminate data distortion caused by temperature fluctuations, ensuring reliable WVTR results) |
| Humidity Control Range | Relative Humidity 90%RH (simulates high-humidity storage and transportation scenarios commonly encountered in global food and pharmaceutical supply chains) |
| Humidity Control Accuracy | ±2%RH (guarantees precise regulation of relative humidity- a fundamental factor for accurate and repeatable WVTR measurement) |
| Transmission Area | 50.24 cm² (a standardized testing area that ensures uniform data comparison across different specimens and laboratories) |
| Sample Size | Φ90 mm (accommodates most industrial-grade film, sheet, and packaging specimens, eliminating the need for excessive sample trimming) |
| Sample Thickness | ≤3 mm (suitable for testing thin flexible films, thick rigid sheets, and composite materials commonly used in packaging and electronics) |
| Number of Samples for Testing | 1 piece (optimized for small-batch testing, R&D prototype analysis, or laboratory environments with focused single-specimen evaluation needs) |
| Overall Dimension | 380×545×315 mm (a compact, space-efficient design ideal for benchtop installation in small-scale QC labs or R&D facilities) |
| Weight | 22 kg (a lightweight yet robust construction that allows for easy relocation within the laboratory while ensuring long-term operational stability) |
| Power | 450 W (energy-efficient operation that supports continuous testing without imposing excessive load on laboratory power systems) |
| Power Supply | AC 220 V, 50 Hz (compatible with standard laboratory power grids in most regions worldwide, minimizing the need for additional power adapters) |
Product Features
• Patented core technology for enhanced testing precision
The instrument is integrated with a high-sensitivity weighing transducer-a pivotal component for gravimetric WVTR analysis-delivering rapid weight-sensing response, long-term operational reliability, and an industry-leading resolution of 0.0001 g/(m²·24h). This ensures accurate detection even for ultra-low barrier materials, such as pharmaceutical cold-formed blister packaging films. For temperature regulation, it adopts bidirectional temperature control technology via semiconductor refrigeration chips, combined with software-based PID (Proportional-Integral-Derivative) automatic temperature adjustment, achieving a control accuracy of ±0.1℃-effectively mitigating environmental disturbances that could compromise the integrity of test data.
• Broad measurement range and strong application flexibility
Equipped with a single test chamber, the instrument features a compact and flexible design that optimizes laboratory space utilization-an ideal solution for small-scale testing facilities or R&D labs with limited benchtop area. Its extensive measurement range (0.1~10000 g/(m²·24h)) covers the full spectrum of barrier materials, from high-barrier EVOH (Ethylene Vinyl Alcohol) films used in food packaging to low-barrier polyethylene sheets for non-critical applications. Furthermore, it can be equipped with customized adaptation accessories to test non-planar packaging formats, including plastic bottles, flexible pouches, and paper bowls-catering to the diverse testing needs of packaging manufacturers, material suppliers, and QC laboratories.
• Ergonomic design, user-friendly operation, and real-time data visualization
Developed from the dual perspectives of human-machine engineering and technical aesthetics, the product features a sleek outer casing crafted via 3D printing technology, with smooth lines that blend durability with modern laboratory design aesthetics. Operation is fully automated: a one-click test function initiates the testing process, and the instrument autonomously runs the test, determines endpoint conditions, and shuts down automatically-reducing human-induced errors and alleviating the workload of operators. It also provides real-time display of four sets of key curves: WVTR-time, temperature-time, humidity-time, and weight-time. These curves support preview and hiding functions, allowing users to focus on critical data trends (e.g., the stability of WVTR over the testing period) for in-depth performance analysis.
• Intelligent operating system with global regulatory compliance
The self-developed smart operating system employs a modular, graphical interface that enables flexible configuration of test parameters (e.g., temperature setpoints, testing duration, and data logging intervals) and intuitive navigation-even for operators with limited technical expertise. Designed in strict accordance with the GMP (Good Manufacturing Practice) Appendix Computerized Systems, it incorporates essential features for regulated industries: an audit trail function (which tracks all user operations and data modifications for traceability) and multi-level user permission settings (which prevent unauthorized access to sensitive test data and system configurations). Test reports can be personalized to meet specific user requirements (e.g., including company logos, references to applicable standards, or custom data columns) and support multiple data output formats (such as PDF and Excel). It also offers electronic signature functionality and online report submission capabilities, streamlining compliance workflows for clients in the pharmaceutical, medical device, and food industries.
• Professional calibration services for accurate and authoritative data
Our company holds the National Standard Substance Grading Certificate for water vapor transmission rate, which is approved and issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, with standard substance codes GBW(E)130543 and GBW(E)130544. We utilize these self-developed national standard substances to conduct calibration and verification of the instrument, ensuring that test data meets national and international accuracy benchmarks. This guarantees inter-laboratory data comparability and compliance with regulatory audits-essential for sectors such as pharmaceuticals and medical devices where data integrity is paramount.
• Integrated laboratory intelligent IoT platform
The instrument is compatible with our laboratory intelligent Internet of Things (IoT) platform, enabling seamless network-based digital management. Through remote authorized login, users can access the platform to manage test data (e.g., query historical test results, generate statistical analysis reports), perform remote diagnostic troubleshooting (reducing equipment downtime by resolving technical issues without on-site visits), and download essential resources-including instrument operation manuals, technical specification documents, and step-by-step operation tutorial videos. This IoT integration enhances laboratory operational efficiency, supports remote collaboration among team members, and simplifies long-term maintenance and management of the instrument.
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