WPT-301 Water Vapor Permeability Tester

WPT-301 is based on the Gravimetric method, and is applicable to the water vapor transmission rate test of plastic films, composite films, sheets and other materials.

Product Introduction

WPT-301 is based on the Gravimetric method, and is applicable to the water vapor transmission rate test of plastic films, composite films, sheets and other materials used in packaging, medical and construction industry. By testing the water vapor transmission rate, the technical index of the materials could be controlled to meet the requirements for production.

Product Features

  • Standard periodic weighing method and auto-zeroing function guarantee the accuracy and uniformity of the testing data.
  • Touch interface is more convenient to operate.
  • The test data is reliable due to the automatic process and the weighing system controlled by the electric cylinder.
  • Innovative circulating dehumidification system with built-in vacuum pump can effectively prevent the formation of humidity gradient and ensure the accuracy.
  • High-precise and automatic control system of temperature can be used under different conditions.
  • Adjustable air velocity enables the appropriate humidity for testing.
  • The data can be stored and outputted in multi-format (including report in excel and cloud sharing).
  • The rapid calibration mode with standard weight-counter is provided.
  • GMP management of user's three-level authority complies with international standard.
  • The instrument processes statistical analysis of single and group data.
  • Equipped with ISP control online and upgrade function.
  • Specialized communicating software can display in real-time, analyze and store data.

Test Principle

Under a certain test temperature, the constant difference of humidity is generated between two sides of the test specimen. The water vapor permeates through the specimen and is into the dry side. By measuring the weight changes of the test dish in different time, water vapor transmission rate and other parameters can be obtained.

Test Standards

This test instrument conforms to many national and international standards:

ISO 2528, ASTM E96, ASTM D1653, TAPPI T464, DIN 53122-1, JIS Z0208, GB/T 1037, GB/T 16928, YBB 00092003


Basic Applications

Including plastic films, plastic composite films, paper-plastic composite films, geomembranes, coextruded films, aluminized films, aluminum foils, aluminum foil composite films, breathable water-proof films and many other film materials

Including engineering plastics, rubber, waterproof building materials and thermal insulation materials, e.g. PP, PVC, PVDC and nylon

Paper, Paperboard
Including paper and paper board

Textile and Non-woven
Including textiles and nonwovens

Technical Specifications

Items Specifications
Test Range 0.1 ~ 10,000 g/m2·24h (Standard)
Number of Specimen 1pc (One chamber)
Accuracy 0.01 g/m2·24h
Resolution 0.0001g
Temperature Range Room temperature ~ 55°C (Standard)
Temperature Accuracy ±0.5°C
Humidity Range 50%RH ~ 90%RH (Relative humidity)
Humidity Accuracy ±2%RH
Air Velocity 0.5 ~ 2.5 m/s (Customization is available)
Test Area 33.18 cm2
Sample Thickness ≤ 3 mm (Customization is available)
Sample Size Φ72 mm
Port Size Ф6 mmPU tubing
Instrument Dimension 440 mm (L) × 450 mm (W) × 450 mm (H)
Power Supply AC 220V / 50Hz ( can be changed to local requirement)
Net Weight 42 kg


Standard Configurations: Instrument, Professional Software, Test Dishes, Desiccant Device, Automatic Moisture Filter, Communication Cable, Round Sample Cutter, Quantitative Dropper, Gloves.

Optional Parts: Standard Film, Container of Desiccant, Air Compressor, 4A Molecular Sieve.

Note: 1. The gas supply port of the instrument is Φ6 mm PU Tubing;
2. Customers will need to prepare for gas supply and distilled water.

Please Note: Jinan Saicheng is always dedicated to the innovation and improvement of product performance and function. Therefore, technical specifications are subject to change without further notice. Jinan Saicheng reserves the rights of final interpretation and revision.
Write a Review
Click to refresh authentication code
Customer Reviews and Testimonials
Original Source:
Jinan Saicheng Instrument, focusing on the R&D of packaging material testing instruments, provides you with cost-effective quality control solutions. We accept customization products for customer special need.
WPT-301 Water Vapor Permeability Tester
WPT-301 Water Vapor Permeability Tester

Why Saicheng Instrument?

Production Facility
Production Facility
Production Facility
Quality Control & Testing Laboratory
Quality Control
Testing Laboratory
Need help or have a question?
For more information about testing technologies, please contact us. Our expert will reply to you ASAP.
Contact Us Today