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TAPPI TIP 0304-69 Understanding Wet Strength: What are MRA, WRA, and WPA?
standard by Technical Association of the Pulp and Paper Industry, 2011
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To determine the wet strength needs of a corrugated box plant, we must first define the level of wet strength needed. Generally, our industry has accepted three levels of wet strength adhesive.Moisture Resistant (MRA) used for the lightest possible applications.
Water Resistant (WRA) medium level of performance.
Waterproof (WPA) highest level of performance.
This Technical Information Paper will identify the key characteristics of each type of ?wet strength? adhesiveand when it would be used. Proper test methods to determine the level of water resistance of a particular box wil bediscussed