W405L Water Vapor Transmission Rate Tester
High-Precision Instrument for Packaging Material Permeability Test

Product Introduction
W405L Infrared Water Vapor Transmission Rate Tester is a high-end precision packaging testing instrument newly developed and upgraded by the GBPI R&D team based on ASTM, GB standards and market demands. It is used to test the water vapor transmission rate of samples under set temperature and humidity conditions.
It is widely used for water vapor transmission performance testing of films, sheets, paper, packages and various materials in food, pharmaceutical, medical devices, daily chemicals, photovoltaic electronics and other industries.
Test Principle
W405L adopts the infrared test principle. The pre-processed sample is fixed in the middle of the test chamber, dividing the chamber into a high-humidity chamber and a low-humidity chamber. Compressed air flows in the high-humidity chamber, and dry nitrogen (carrier gas) flows in the low-humidity chamber at a fixed rate.
Due to the humidity gradient, water vapor permeates from the high-humidity chamber to the low-humidity chamber. The water vapor passing through the sample is carried by the flowing dry nitrogen to the infrared sensor, and parameters such as the water vapor transmission rate are obtained through the electrical signal output by the sensor.
Compliance Standards
- ISO 15106-2
- ISO 21760-1
- ASTM F1249
- GB/T 26253
- JIS K7129-2
- Chinese Pharmacopoeia 2025 Edition 4010
- YBB 00092003
Technical Parameters
Product Features
High-Precision Infrared Sensor
Independent patented sensor with ultra-high stability, low failure rate and long service life. Resolution up to 0.0001 g/(m²·24h).
Accurate & Reliable Data
Precise temperature & humidity control. Real-time monitoring, stable test environment, high repeatability.
Wide Test Range
3 independent test chambers, supports 3 same or different samples simultaneously. Suitable for high, medium and low barrier materials.
Intelligent System
User-friendly OS, audit trail, multi-level user rights, electronic signature, customized reports, GMP compliant.
Professional Calibration
National certified standard materials (GBW(E)130543 / GBW(E)130544) ensure accurate and authoritative test data.
Applications
About GBPI
GBPI is a professional manufacturer of packaging testing instruments with independent R&D, production and service capabilities. Our products comply with international standards and are widely used in global food, pharmaceutical and material industries.
We provide professional calibration, after-sales and technical support services to ensure stable operation of instruments and reliable test data.

info@gbtest.cn



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