PR 1750 A2

PPG PR-1750 Class A is an aircraft integral fuel tank sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 182 °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. Tests are run to AMS 3276 Class A methods.

Application Properties (A-2)

• Colour: A black, B beige, mixed dark grey; mix ratio by weight 10:100
• Base viscosity 300 P (30 Pa·s)
• Application life 2 hours; tack free under 24 hours; 35 Shore A in 48 hours

Performance

• Specific gravity 1.57; non-volatile content 86%; hardness 50 Shore A
• Peel: 151–165 N/25 mm after JRF, 151–165 N/25 mm after JRF/salt water, 100% cohesive
• Weight loss 5.0% and swell 10.1% after 7 days in JRF at 60 °C
• No cracking or loss of adhesion at −54 °C; can be sanded and painted

Storage

• At least 9 months below 27 °C in unopened containers