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The breathable vapor-permeable adhesive medical dressing is a clinically common medical material that must exhibit excellent moisture permeability, with a water vapor transmission rate exceeding the rate at which moisture naturally evaporates from the skin. This article primarily introduces the testing methods and significance of moisture permeability in adhesive medical fixation dressings.
Medical dressings are used to cover skin wounds, sores, or other injuries—they serve as the medical materials that protect and bandage these lesions. Currently, commonly used materials for medical dressings include natural materials, synthetic materials, medicated dressings, and fixation dressings. Among these, adhesive medical fixation dressings fall under the category of fixation dressings.
Commonly used fixed adhesive materials include adhesive bandages and gauze, cohesive bandages and gauze, acrylic tape, and zinc oxide rubber cloth, among others. Adhesive bandages and gauze are made by coating a layer of adhesive—such as rubber or polyacrylic acid—onto fabric, non-woven material, or plastic film, enabling them to stick securely in place. Cohesive bandages, on the other hand, feature a layer of finely dispersed natural latex applied to an elastic bandage, allowing it to adhere firmly to itself during use without sticking to skin or clothing. Depending on their application, adhesive medical fixation dressings can be categorized into breathable vapor-permeable films and waterproof dressings.
The normal human skin loses between 240 and 1,800 grams of moisture per square meter over 24 hours (at 37°C). In the case of water-vapor-permeable film dressings, if the dressing's moisture permeability is lower than the skin's natural rate of moisture evaporation, water vapor may accumulate between the skin and the dressing. In severe cases, this can lead to skin maceration, impairing both wound healing and the adhesive performance between the dressing and the skin.
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