PR 1440 A2

PPG PR-1440 Class A is an aircraft integral fuel tank sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It is designed for brush sealing of fasteners in fuel tanks and other fuselage sealing applications, and maintains elastomeric properties after prolonged exposure to jet fuel and aviation gasoline. It is a two-part, manganese dioxide cured polysulfide applied by brush in thicknesses up to 25 mils, curing at room temperature. Tests are run to AMS-S-8802 Class A methods.

Application Properties (A-2)

• Colour: A black, B off-white, mixed dark grey; mix ratio by weight 10:100
• Base viscosity 300 P (30 Pa·s)
• A-2: application life 2 hours; tack free under 36 hours; 35 Shore A in 72 hours

Performance

• Specific gravity 1.57; non-volatile content 86%; hardness 48 Shore A
• Peel: 156–165 N/25 mm after JRF, 142–156 N/25 mm after JRF/salt water, 100% cohesive
• Tensile strength 2241 kPa (325 psi); elongation 225%
• No corrosion after 20 days in JRF/salt water; no cracking or loss of adhesion at −54 °C; repairable to itself

Storage and Packaging

• Kits and Semco cartridges: at least 9 months below 27 °C in unopened containers
• Pre-mixed and frozen Semco cartridges: at least 30 days below −40 °C