W-E-31-G

Triple-Cell Water Vapor Transmission Rate Tester

Designed for Comparative Testing, Material Evaluation and Laboratory Efficiency

The LabStone W-E-31-G Water Vapor Transmission Rate Tester is a triple-cell electrolytic WVTR analyzer developed for laboratories that require simultaneous testing of multiple specimens while maintaining high measurement accuracy.

Compared with traditional single-cell systems, the W-E-31-G allows researchers and quality engineers to evaluate multiple material formulations, suppliers or production batches in parallel, significantly improving laboratory efficiency and decision-making speed.

Why Choose a Triple-Cell WVTR Tester?

In many laboratories, the challenge is not simply measuring WVTR.

The real challenge is comparing materials efficiently.

For example:

• Which supplier provides better barrier performance?
• Which coating thickness performs best?
• Which multilayer structure offers longer shelf life?
• How does a new formulation compare with the current product?

Testing samples one by one can dramatically slow down development and qualification projects.

The W-E-31-G addresses this challenge by allowing three specimens to be evaluated simultaneously under identical environmental conditions.

Ideal Applications:

Comparative Material Studies

Simultaneously compare:

• Different film formulations
• Different barrier coatings
• Different suppliers
• Different production batches

under the same test conditions.

Packaging Optimization Projects

Used for evaluating:

• Multilayer packaging structures
• Barrier film upgrades
• Shelf-life extension programs
• Sustainable packaging alternatives

Supplier Qualification Programs

Many manufacturers receive materials from multiple vendors.

The W-E-31-G enables side-by-side WVTR comparison, making supplier evaluation faster and more reliable.

Process Improvement Studies

Suitable for comparing:

• Coating process variations
• Extrusion conditions
• Lamination methods
• Material modifications

Research and Development

Useful for:

• Product development
• Material screening
• Barrier performance benchmarking
• Laboratory validation studies
   

Function：

Determining water vapor permeability characteristics of materials and container.

Suitable for: Film, sheet, container and construction material of plastic, textile, leather and metal.

Principle:

The W-E-31-G employs the Electrolytic Detection Sensor Method.

A humidity-controlled environment is maintained on one side of the specimen while dry carrier gas continuously sweeps the opposite side.

Water vapor passing through the specimen is transported into the electrolytic sensor chamber.

The sensor directly measures the absolute amount of transmitted moisture and automatically calculates:

• Water Vapor Transmission Rate (WVTR)
• Water Vapor Permeability
• Moisture Barrier Performance

Because all three cells operate under identical environmental conditions, direct sample comparison becomes highly reliable.

Compliance Standards：

International Standards

• ISO 15106-3
• ASTM F3299
• JIS K7129
• DIN 53122-2

China Standards

• GB/T 21529
• Current YBB pharmaceutical packaging requirements

Key Features：

Triple Independent Test Cells

Three specimens can be tested simultaneously.

Advantages include:

• side-by-side comparison
• improved laboratory efficiency
• reduced project timelines
• better data consistency

High-Sensitivity Electrolytic Sensor

Features:

• absolute moisture detection
• excellent repeatability
• stable long-term performance
• low measurement uncertainty

Comparative Testing Advantage

All specimens are tested under:

• identical temperature
• identical humidity
• identical gas flow conditions

providing highly reliable comparative results.

Precision Environmental Control

Supports:

• Humidity: 35%–90% RH
• Temperature: 15–45°C

for realistic storage condition simulation.

Leak-Free Pneumatic Clamping

Advanced H-type clamping system ensures:

• easy installation
• consistent sealing
• reduced operator influence

Intelligent Automation

Supports:

• automatic diagnostics
• one-click testing
• unattended operation
• automatic calculations
• automatic report generation
  
  

Specification:

 Notice:   Notice:Measure Error to 0.0001 g/m2.24h is optional.

System Configuration: 

Mainframe, testing computer, professional testing software, water trap, sampler, nitrogen cylinder pressure reducing valve, sealing grease. 

Optional: GMP computerized system function module, container test component, container temperature control test component, specimen MASK (7cm²/1cm²）.

Self-Supply: High purity nitrogen, distilled water.

Application Industries:

Flexible Packaging

Used for comparing barrier performance of:

• PET structures
• PE films
• EVOH multilayer films
• PVDC coated materials
• Aluminum-coated films

Pharmaceutical Packaging

Supports development and qualification of:

• blister materials
• medical pouches
• pharmaceutical sachets
• drug packaging laminates

Sustainable Packaging

Suitable for:

• biodegradable films
• recyclable packaging
• compostable materials
• bio-based barrier films

Electronics Industry

Applicable to:

• OLED barrier films
• battery packaging
• flexible electronic substrates
• moisture-sensitive materials

Testing Laboratories

Ideal for:

• certification projects
• customer sample evaluation
• comparative performance testing
• verification studies

Typical Users:

The W-E-31-G is widely used by:

• Packaging Development Teams
• Material Evaluation Laboratories
• Pharmaceutical Packaging R&D Centers
• Flexible Packaging Manufacturers
• Third-Party Testing Laboratories
• Universities
• Research Institutes
• Sustainability Research Centers

Frequently Asked Questions(FAQ):

Why choose a triple-cell WVTR tester?

A triple-cell system allows direct comparison of multiple materials under identical testing conditions, improving efficiency and confidence in material selection.

Is the W-E-31-G suitable for supplier comparison projects?

Yes. It is particularly useful for comparing barrier performance among different suppliers or production batches.

Can all three specimens be tested simultaneously?

Yes. Three specimens are tested in parallel under the same environmental conditions.

What is the advantage over a single-cell WVTR tester?

The main advantage is faster comparative analysis and improved laboratory productivity.

Is the instrument suitable for biodegradable materials?

Yes. It is widely used for evaluating sustainable packaging and bio-based barrier materials.

Can containers be tested?

Yes. Optional container testing accessories are available.

What industries commonly use this model?

Packaging, pharmaceuticals, sustainability research, electronics and third-party testing laboratories.

Does this product have other names?

English

• Triple Cell WVTR Tester
• Water Vapor Transmission Rate Tester
• Comparative WVTR Analyzer
• Moisture Barrier Tester
• Water Vapor Permeability Tester
• Electrolytic WVTR System

German

• Dreikammer-Wasserdampfdurchlässigkeitsprüfer

French

• Analyseur Triple Cellule de Transmission de Vapeur d’Eau

Spanish

• Analizador de WVTR de Tres Celdas

Portuguese

• Testador WVTR de Três Células

Japanese

• 三セル水蒸気透過率試験機