The Water Vapor Transmission Rate (WVTR) Tester
The Water Vapor Transmission Rate (WVTR) Tester is a precision instrument designed to measure the water vapor permeability of various materials under controlled environmental conditions. The system can simulate real-world application environments, providing highly accurate and reproducible results. Its automated operation ensures consistent testing across multiple samples, making it suitable for research, quality control, and industrial applications.
Applications
(1) Measurement of water vapor transmission through textiles, nonwovens, films, and leather.
(2) Testing of high-tech components and industrial consumer products for moisture barrier performance.
(3) Evaluation of food packaging materials for water vapor permeability.
(4) Filtration and membrane materials testing for moisture transport.
(5) Research and development in personal care, hygiene, and medical products.
(6) Performance testing for varying environmental conditions including humidity, temperature, and pressure gradients.
Standards
The WVTR Tester is compliant with the following international and national standards:
(1) GB 1037 – Test method for water vapor permeability of paper
(2) YBB0009-2003 – Medical material vapor transmission
(3) ASTM E96 – Standard Test Methods for Water Vapor Transmission
(4) GB/T 17146 – Textile water vapor permeability test
(5) GB/T 16928 – Leather water vapor permeability
(6) YY/T 0471.2 – Medical textile vapor transmission
(7) ASTM D1653 – Water vapor transmission rate of plastic films
(8) ISO 2528 – Textiles – Determination of water vapor permeability
(9) DIN 53122-1 – Plastic films – Water vapor transmission
(10) JIS Z 0208 – Textile materials water vapor transmission
(11) TAPPI T464 – Paper and board moisture transmission
Parameters
| Parameter | Specification |
|---|---|
| Humidity Range | 1% – 100% RH |
| Temperature Range | Ambient – 100°C |
| Pressure Difference Accuracy | ±0.15% |
| Mass Flow Sensor Accuracy | ±1% |
| Mass Flow Controller Accuracy | ±1% |
| Sample Size | Large range of flat specimens supported |
| Test Method | Independent gas flow on both sides of the sample, measuring humidity and gas flow to calculate WVTR |
| Automation | Fully automated testing, data acquisition, storage, and simplified reporting |
Features
(1) Independent control of humidity on both sides of the sample.
(2) Precise control of applied pressure gradients.
(3) Wide range of test temperatures to simulate application environments.
(4) Ability to control humidity gradients in the pressure cell.
(5) Supports a large variety of flat sample sizes.
(6) Fully automated testing, data acquisition, and data storage.
(7) User-friendly software interface for real-time monitoring and reporting.
Accessories
(1) Main WVTR tester unit
(2) Temperature and humidity sensors
(3) Gas flow controllers and mass flow sensors
(4) Sample holders for flat specimens
(5) PC interface and software (optional)
(6) Calibration kits (optional)
Test Procedures
Place the sample in the dedicated sample holder.
Set desired humidity and temperature conditions on both sides of the sample.
Adjust the pressure gradient according to test requirements.
Start the automated measurement sequence.
Monitor real-time humidity and gas flow data.
The instrument calculates WVTR using mass balance principles.
Data can be stored internally or exported for further analysis.
Maintenance Information
(1) Regularly clean sensors and sample holders to avoid contamination.
(2) Calibrate humidity, temperature, and flow sensors periodically according to standards.
(3) Check tubing and seals for leaks to maintain measurement accuracy.
(4) Avoid exposing the instrument to corrosive gases or extreme conditions.
(5) Perform software updates and backup data routinely.
FAQ
What is this product?
A precision tester for measuring the water vapor transmission rate of various materials under controlled conditions.
What is it used for?
To determine moisture permeability in textiles, films, leather, packaging, and other industrial or medical products.
Why is it important?
Ensures product performance in moisture-sensitive applications, quality control, and compliance with international standards.
Which industries can use it?
Textiles, leather, nonwovens, food packaging, filtration/membrane, medical, hygiene, and consumer goods.
What types are available?
Standard WVTR testers with varying sample size capacity and automation levels; optional PC interface and flow control systems.
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