Single-chamber WVTR Tester

Water Vapor Transmission Rate Tester is designed to measure the barrier properties of packaging materials against water vapor. The ability to block water vapor is a critical factor affecting the shelf-life quality of products and serves as an important reference for shelf-life analysis. By testing and analyzing this parameter, enterprises can address issues such as moisture-induced deterioration caused by the sensitivity of products to water vapor.

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Product Introduction

Function and Application

This instrument employs a gravimetric analysis method within a single test chamber structure to measure the water vapor transmission rate of flexible films, sheets, or soft packaging materials. Its primary objective is to obtain data on the material's water vapor transmission rate, which serves as one of the most critical indicators for evaluating packaging moisture barrier performance and predicting product shelf life.

Technical Parameters

Item	Parameter
Measuring range	0.02 - 10,000g/(m²·24h)
Test accuracy	±2%
Resolution	0.0001g
Maximum weighing capacity	200g
Test temperature	5°C - 55°C
Relative humidity	90%RH
Temperature control accuracy	±0.5°C
Power supply	AC 220V/50Hz
Test area	50.26cm² (other options available)
Chambers/ Cells	1 piece
Dimensions	400mm×500mm×330mm
Test area	Approximately 50.26cm²

Test Principle

The core principle of the gravimetric water vapor transmission rate tester is based on the Gravimetric Method, which calculates the amount of water vapor transmitted through a unit area of material per unit time by measuring the mass change of a sample caused by water vapor permeation under specific temperature and humidity conditions.

Specifically, during testing, a certain amount of desiccant (such as anhydrous calcium chloride) or water is placed into a sealed test cup. The cup opening is then sealed with the sample to be tested, forming an enclosed chamber. The entire test cup is placed in a constant temperature and humidity environment. If a desiccant is inside the cup, water vapor from the external environment permeates through the sample into the cup and is absorbed, leading to an increase in the total mass of the test cup. Conversely, if water is inside the cup, water vapor diffuses outward from the cup, resulting in a mass decrease. By periodically weighing the mass change of the test cup, the water vapor transmission rate can be calculated.

Applications

Food Packaging: Testing the moisture barrier properties of potato chip bags, coffee pouches, chocolate wrappers, etc.

Pharmaceutical Packaging: Evaluating the moisture resistance of pharmaceutical packaging materials such as aluminum-plastic composite films and tropical aluminum blister packs to ensure drug stability.

Electronics & Industrial Product Packaging: Testing moisture barrier bags used for protecting precision electronic components and metal products.

Material R&D and Quality Control: Used by packaging material manufacturers and end-users for developing new materials, conducting incoming material inspection, and performing production quality control.

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