WPT-301B Water Vapor Permeability Tester

Product Introduction

WPT-301B 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 periodically weighing method and auto zero before each weighing guarantee the accuracy and uniformity of the testing data
  • One sample for each test, the weighing system is controlled by the gas cylinder which assured the reliability of the test data.
  • Standard air velocity to prevent the humidity difference spread which ensures the accuracy of the test
  • Wide range and high-precision of automatic temperature and humidity control to support various combinations of non-standard test conditions
  • Micro computer control to assured the fully automatic testing process
  • The test results can be saved and exported in different format, the test report could be export in Excel format.
  • Wide range power input is available
  • Standard calibration weights to assured the accuracy of test data
  • Universal USB port is convenient for the data export and transmission
  • Supports Data Sharing System for uniform and systematic data management

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 0.01 ~ 10,000 g/m2·24h (Standard)
Number of Specimen 1pc
Accuracy 0.01 g/m2·24h
Resolution 0.0001g
Temperature Range 15°C ~ 65°C (Standard)
Temperature Accuracy ±0.5°C
Humidity Range 10%RH ~ 98%RH (Standard 90%RH)
Humidity Accuracy ±1%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 Φ74 mm
Port Size Ф6 mmPU tubing
Instrument Dimension 440 mm (L) × 450 mm (W) × 450 mm (H)
Power Supply AC 220V 50Hz
Net Weight 42 kg


Standard Configurations: Instrument, Professional Software and Communication Cable, Test Dishes, Desiccant Tube, Automatic Moisture Filter, Standard Weight, Round Sample Cutter, and Valve Set, Quantitative Dropper, Gloves

Optional Parts: Reference Film, Desiccant

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.
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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-301B Water Vapor Permeability Tester
WPT-301B Water Vapor Permeability Tester
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