Investigation of Polyurethane Adhesives for Use in the Apache Aviator NBC Protective Mask

摘要

Polyurethane adhesives are currently used in Apache aviator masks to secure polycarbonate lenses to a bromobutyl-natural rubber face piece. An alternative polyurethane adhesive packaged in a pre-measured assembly was investigated to determine its suitability for mask remanufacturing operations. Seventy-five prototype assemblies were prepared with the standard and alternative adhesive. The composite assemblies were then destructively tested on an Instron machine, in tension, to compare rupture strength of the polycarbonate-adhesive-rubber joint as a function of curing regime and surface preparation. Rupture load measurements indicate the alternative adhesive investigated is adequate for securing lenses within the aviator mask. Stress applied at joint failure ranged from 146 to 343 pounds per square inch. Prototypes cured at 63 degrees Celsius are approximately 38% stronger than ambient cured specimens.