High Performance Adhesives and Sealants Technical Data Sheet December 2009 Ultrabond® 55391 Product Description Hernon® Ultrabond® 55391 is a UV curable adhesive product that provides excellent impact resistance, and adhesion to a wide selection of substrates including composites, metals, glass, ceramics, and plastics such as polyester, PVC, cellulose acetate, and nylon. Product Benefits • UV fluorescence for in-process inspection • Color changes from blue to clear after UV exposure for process verification • 100% solid system (no solvents) • Excellent adhesion to a variety of surfaces • Excellent environmental resistance • Good gap filling properties • No shrinkage due to solvent evaporation • Rapid room temperature cure Typical Properties (Uncured) Typical Properties (Cured) General Information This product is not recommended for use in pure oxygen and/or oxygen rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials. For safe handling information on this product, consult the Material Safety Data Sheet (MSDS). Factors Affecting UV Curing • Dark surfaces lengthen cure time. • Full range (UV-A, B & C) lamps provide faster cures than filtered sources. • All UV sources degrade with use. Check output with a radiometer. • Thicker films require longer cures. • Light intensity decreases as distance from UV source increases. • Some clear plastics may contain UV inhibitors.

Hernon Technical Data Sheet Ultrabond® 55391 Page 2 of 2 Precautions When Using UV Lamps • Never look directly at UV source. • Wear protective UV goggles • Do not expose bare skin to high intensity UV light. • Wear protective clothing. • Use in a well-ventilated area. Some UV sources generate ozone. Provide shielding around high intensity UV sources. • High intensity UV sources generate heat. Take appropriate precautions. Storage Ultrabond® 55391 should be stored in a cool, dry location in unopened containers at a temperature between 46°F to 82°F (8°C to 28°C) unless otherwise labeled. Optimal...