GBPI W360 Water Vapor Transmission Rate Tester

Overview

The GBPI W360 Water Vapor Transmission Rate (WVTR) Tester is a gravimetric, dual-mode permeation analyzer engineered for high-precision determination of water vapor transmission through flexible packaging films, laminates, coated papers, and barrier-coated substrates. It operates on the principle of dynamic gravimetric measurement: a conditioned test specimen separates two controlled environmental chambers — one containing distilled water (high-humidity side) and the other a desiccant or regulated humidified gas stream (low-humidity side). As water vapor diffuses across the sample, mass loss from the water-filled cup is monitored continuously via high-resolution electromagnetic force compensation balance. The system calculates WVTR in g/(m²·24h) based on linear regression of mass change over time, conforming to the fundamental methodology defined in ASTM E96 and ISO 2528.

Key Features

• Modular six-station independent testing architecture: Each station features dedicated weighing sensors, temperature/humidity control loops, and real-time data acquisition — enabling concurrent, non-interfering evaluation of up to six distinct materials or conditions.
• Advanced dual-mode humidity control: Standard desiccant-based dry-side operation (0–20 %RH) with optional dual-stream humidified gas mixing system (30–90 %RH), delivering precise, stable, and traceable RH profiles without condensation risk.
• Electromagnetic temperature regulation with programmable ramping: Achieves ±0.1 °C uniformity across the 10–50 °C operating range using step-controlled heating/cooling, eliminating thermal overshoot and ensuring ISO-compliant conditioning stability.
• Integrated human-machine interface: Front-panel LCD display and PC-based software provide synchronized parameter configuration, live curve visualization, automated report generation (PDF/Excel), and full audit trail logging.
• Robust sensor protection logic: Automatic overload detection, zero-point drift compensation, and adaptive filtering ensure long-term signal integrity under continuous 24/7 operation.
• Comprehensive calibration support: Includes NIST-traceable 200 g reference weight, factory calibration certificate, and built-in temperature/humidity verification routines aligned with GLP documentation requirements.

Sample Compatibility & Compliance

The W360 accommodates flat, non-porous, and semi-crystalline polymeric films up to 2 mm thick, including PET, PE, PP, PVDC, EVOH, aluminum foil composites, metallized papers, and pharmaceutical blister lidding materials. Its Φ60 mm test area (28.2744 cm²) and standardized cup geometry comply strictly with specimen dimensional requirements in ASTM E96 (Procedure A/B), ISO 2528, and YBB 00092003. All hardware and firmware are validated per ICH Q5C stability protocol guidelines, supporting regulatory submissions for FDA 21 CFR Part 11–compliant environments when paired with optional electronic signature and audit trail modules.

Software & Data Management

GBPI’s proprietary WinWVTR software provides full lifecycle data governance: real-time multi-channel plotting (mass vs. time, derivative curves), automatic slope validation per ASTM E96 §7.3.2, outlier rejection algorithms, and configurable pass/fail thresholds. Raw data files are stored in encrypted binary format with embedded metadata (operator ID, timestamp, environmental logs, calibration history). Export options include CSV for LIMS integration, PDF reports with header/footer branding, and XML for ERP synchronization. Software adheres to ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) and supports 21 CFR Part 11 compliance through role-based access control and electronic signature workflows.

Applications

• Quality assurance of food packaging barrier performance under accelerated shelf-life simulation conditions.
• Development and validation of high-barrier coatings for flexible electronics encapsulation.
• Stability testing of pharmaceutical blister packs per USP and Ph. Eur. 5.3.
• Comparative WVTR screening of biodegradable films (PLA, PHA, starch blends) under varying RH gradients.
• Process validation of vacuum metallization, SiO_x sputtering, and ALD coating lines.
• Regulatory dossier preparation for FDA, EMA, and NMPA submissions requiring documented permeation data.

FAQ

What standards does the W360 fully support out-of-the-box?
The instrument is pre-configured to execute ASTM E96 (Desiccant and Water Methods), ISO 2528, GB/T 1037, and YBB 00092003 test protocols, with software templates, calculation engines, and reporting formats aligned to each standard’s acceptance criteria.

Can the W360 operate unattended for extended periods?
Yes — it supports continuous 168-hour (7-day) uninterrupted testing with automatic data logging every 10 minutes, integrated power-failure recovery, and email/SNMP alerting upon deviation from setpoint tolerances.

Is third-party calibration certification available?
GBPI offers UKAS-accredited calibration services for balance, temperature, and humidity subsystems, with certificates valid for 12 months and traceable to NPL and NIM standards.

How is humidity accuracy verified during routine use?
The system includes a dual-channel capacitive RH sensor with automatic self-diagnostic cycling; users may perform in-situ verification using NIST-traceable chilled-mirror hygrometers or saturated salt solutions per ISO 17025 Annex C.

Does the software support multi-user environments with permission tiers?
Yes — WinWVTR implements three-tiered access (Operator, Supervisor, Administrator) with password complexity enforcement, session timeout, and full action logging compliant with 21 CFR Part 11 §11.10(d).