PR 1197

PPG PR-1197 is a sprayable polyurethane coating designed for use as a secondary fuel barrier on aircraft integral fuel tanks. It is typically applied to the exterior surfaces of the centre wing box tank; should a leak occur in the tank's primary seal system, it aids in containing the leak and preventing fuel migration. The mixed material is very thixotropic, giving good film thickness even on vertical surfaces, and cures at room temperature to a resilient transparent coating with high elongation and tensile strength.

Application Properties (BMS 5-81 Type II Class 2 test methods)

• Colour: Part A tan, Part B clear straw; mix ratio A:B 90:100
• Viscosity: A 30 P (3 Pa·s), B 20 P (2 Pa·s), mixed 45 P (4.5 Pa·s); application life ½ hour
• At 0.25–0.50 mm wet film: tack free 7 hours and cure 24 hours at 25 °C; ½ hour / 2 hours at 66 °C

Performance (cured 7 days at 25 °C)

• Non-volatile content: A 74%, B 92%; ultimate cure hardness 85
• Tensile strength 3000 psi (20 MPa), 4000 psi (27 MPa) after 24 hours at 121 °C; elongation 475% / 450%
• No loss of adhesion, blistering or other film failure

Application and Storage

• Two-part can kits; apply without thinning by brush or airless spray; 0.25–0.50 mm (10–20 mil) wet film on vertical surfaces
• May be thinned with ketone solvents (MEK, MBK, EAK, pentoxone) for conventional spray; thinning lengthens pot life and cure
• At least 6 months below 27 °C (80 °F) in unopened containers