The Importance of Moisture-Proof Performance Testing for Military Packaging Materials

During the storage and transportation of military products, packaging may be exposed to environmental factors such as high temperatures, high humidity, rain, direct sunlight, chemical gases, and mold. The primary purpose of moisture-proof packaging is to protect the contents from external damp gases or effectively block them, ensuring that when users open the package, the product inside remains free from moisture-related damage.

Good moisture-proof performance of packaging materials is one of the critical safeguards against corrosion damage during the storage of military equipment. So, Military Product Packaging Inspection What are the important implications of conducting moisture-proof performance tests on military packaging materials?

Military packaging materials are a crucial tool for effectively shielding against corrosive gases, playing a vital role in corrosion prevention during the storage of military equipment. Common corrosive gases found in the air include oxygen, carbon dioxide, sulfur dioxide, and others—these gases trigger metal corrosion via electrochemical reactions.

Therefore, when equipment is exposed to humid environments, water vapor adsorbs onto the metal surfaces, forming a thin water film that dissolves certain gases like oxygen and carbon dioxide, creating an electrolyte solution. This, in turn, triggers electrochemical reactions on the metal surface, significantly accelerating corrosion. To ensure long-term protection against corrosion for military equipment stored in dry conditions, the packaging materials must exhibit superior moisture-proof properties—this necessitates careful material selection and design. Military Product Packaging Inspection Conducting moisture-proof performance testing.

Currently, methods for testing the water vapor transmission rate of plastic film materials include the cup method, electrolytic sensor method, infrared sensor method, and humidity sensor method. Given that the moisture-proof performance of the test sample is particularly high—with a low water vapor transmission rate—an electrolytic sensor method was chosen for the analysis, following the standard GB/T 21529-2008 "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets—Electrolytic Sensor Method."

Military Product Packaging Inspection Experimental equipment typically uses the C330 water vapor transmission rate testing system to measure the water vapor permeability of samples. Military Product Packaging Inspection Test.

Military product packaging inspection The principle of the test is based on the electrolysis sensor, which calculates a material’s water vapor transmission rate by measuring the quantitative relationship between water molecule electrolysis and the resulting electrolytic current. During the test, the sample is clamped securely between the upper and lower chambers of the testing device, ensuring that the two chambers remain completely independent. A carrier gas with a controlled humidity level flows through the upper chamber, while dry carrier gas circulates in the lower chamber. This setup creates a distinct humidity gradient across the sample: water vapor migrates from the humidified upper chamber, permeating through the sample into the drier lower chamber, where it is carried away by the carrier gas directly to the sensor for electrolysis. The device then quantitatively determines the material’s water vapor transmission rate by analyzing the electrolytic charge produced in proportion to the number of water molecules involved. If the sample is in the form of a container, the inner side of the container is exposed to dry carrier gas, while the outer surface faces the humidified carrier gas environment.

Moisture protection is a critical step in the corrosion prevention process for military equipment, and moisture-proof performance testing is also essential. Military Product Packaging Inspection One of the key projects. As protective materials for military equipment, the moisture resistance of packaging materials directly affects the level of humidity to which military devices are exposed during storage, making it crucial for preventing corrosion of the equipment.