Adhesin® 51-3264BL™ is a light blue colored full resin front seal designed for use on envelopes that are to be stored under high humidity conditions. This adhesive, sometimes referred to as a "tropical gum", possesses the highest level of humidity resistance and layflat attainable in a front seal formulation. Excellent adhesion to a variety of proprietary papers as well as laser printer compatibility are other important features of this specialty gum. Suitable for use on all roller type seal application systems.