TM 1-1520-240-BD Table 2-4.  Adhesive System Criteria ADHESIVE NO. OF POT LIFE SYSTEM COMPO- PHYSICAL AT 21.1 °C FLASH SHELF STORAGE NO. NENTS PROPERTIES (70⁰F) POINT LIFE TEMPERATURE 8 1 Cures to a rubbery 5 to 10 50°F 8 months Below 80°  F solid. Excellent (10°C) for adhesive (26.7°C) peel strength and for primer 12 months good insulating for primer properties. Resistant to water and ozone. Poor resistance to oil and no resistance to fuel 9 2 A rigid adhesive 1 hour 150°F 2 years Below 80°F high in tensile and (66°C) (26.7°C) shear strength, but low in peel strength. Good resistance to fuel and oil but poor resistance to water and salt spray 10 2 A tough flexible 30 minutes 150°F 6 months Below 80°F adhesive, resistant (66°C) (26.7°C) to water, fuel and oil. Poor resistance to salt spray 11 2 Cures to a tough, 1/2 hr for 800F 6 months 400 to 80 F SEE NOTE flexible rubber with B-1/2 1 hr (26.7°C) (4.5°  to 26.7°C) good peel strength. for B-1 Resistant to fuel, 2 hr for B-2 water, and salt 4 hr for B-4 spray 8 hr for B-8 12 2 A rigid adhesive 20 to 30 395°F 2 years Below 80°F high in shear and minutes (201.8°C) (26.7°C) tensile strength 13 3 A rigid adhesive 10 minutes - 1 year Below 75°  F which will not (23.9°C) craze acrylics NOTE The acceptable adhesives under this system are available in a choice of pot lives. For example, B-1/2 indicates a pot life of 30 minutes, B-1 a pot life of 1 hour, etc. 2-49