Water Vapor and Food Packaging: Proper Barrier Testing Matters for Product Quality In the food packaging industry, ensuring the barrier and sealing properties of packaging materials is critical. Among numerous influencing factors, water vapor transmission rate (WVTR) is a commonly overlooked yet vital element. If packaging materials permit moisture penetration, it may lead to product quality degradation, reduced shelf life, and compromised consumer experience. Conducting proper and compliant WVTR testing effectively prevents water vapor permeation. Understanding Infrared Testing Method The infrared method is employed to measure a material's permeability to water vapor, thereby evaluating the barrier properties of different materials. Its core principle relies on the infrared absorption characteristics of water vapor within the 3-4 micrometer wavelength range. Infrared sensors precisely measure water vapor concentration by detecting changes in infrared radiation at these specific wavelengths. During testing, the membrane material is exposed to a controlled humidity

environment. An infrared sensor positioned on the opposite side of the membrane monitors changes in water vapor concentration as it permeates through the material, enabling the calculation of water vapor transmission rate. Understanding Gravimetric Method The gravimetric method is a commonly used technique for testing water vapor transmission rate (WVTR). Its principle is simple and intuitive: it determines the water vapor transmission rate by measuring the change in water vapor permeating through the membrane material over a specific period of time. Water vapor

Infrared Testing Method Machines W201 Water Vapor Transmission Rate Tester W203H Water Vapor Transmission Rate Tester Based on infrared testing principles, this method provides wide-range, high-efficiency water vapor transmission rate (WVTR) testing for medium-to-high barrier materials. It is suitable for determining the water vapor transmission rate of various materials including plastic films, composite films, bags, bottles, and materials used in medical and construction applications.

Gravimetric Method Machines W301 Water Vapor Transmission Rate Tester W306 Water Vapor Transmission Rate Tester W309 Water Vapor Transmission Rate Tester Based on the cup method testing principle, this instrument is suitable for determining water vapor transmission rate and water vapor transmission coefficient of various materials such as plastic films, composite films, bags, bottles, and materials in medical and construction fields. It enables control and adjustment of material technical specifications to meet diverse product application requirements.

Is your packaging truly protecting your products? Conducting safety-compliant water vapor transmission rate testing not only safeguards product longevity but also elevates brand credibility. Whether for snacks, frozen foods, or pharmaceuticals, quality packaging is essential for maintaining product integrity and consumer trust. Contact Saicheng today to verify if your packaging meets standard protection requirements. We are committed to ensuring your products remain in optimal condition.