What does WAI mean in UNCLASSIFIED

The Water Absorption Index (WAI) is a measure of the amount of water absorbed by a material. It is calculated by measuring the weight of a dry material before and after immersion in water for a specified period. The difference in weight is then divided by the original dry weight to express the water absorption capacity as a percentage.

WAI is a crucial factor in selecting materials for various applications. For instance, in the construction industry, materials with low WAI are preferred for exterior applications where exposure to water is unavoidable. It helps prevent water damage, such as cracking, swelling, and mold growth.

WAI is measured following specific standards, such as ASTM C150 or ISO 15148. These standards outline the sample preparation, immersion procedure, and calculation methods to ensure consistent and reliable results.

Several factors can affect the WAI of a material, including porosity, density, and chemical composition. Materials with higher porosity tend to absorb more water, resulting in a higher WAI. Additionally, materials with a lower density are more likely to have a higher WAI.

WAI finds applications in various industries, including construction, manufacturing, and pharmaceuticals. In construction, it is used to assess the durability and suitability of building materials. In manufacturing, it helps determine the performance of products that come into contact with water, such as textiles and packaging materials. In pharmaceuticals, WAI is a parameter for characterizing drug delivery systems and ensuring patient safety.