PPG PS 890 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 and fay sealing of 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 white, mixed grey; mix ratio by weight 10:100
- Base viscosity 250 P (25 Pa·s)
- A-2: application life 2 hours; tack free under 30 hours; 35 Shore A in 60 hours
Performance
- Specific gravity 1.55; non-volatile content 85%; hardness 50 Shore A
- Peel: 151–178 N/25 mm after JRF, 156–173 N/25 mm after JRF/salt water, 100% cohesive
- Tensile strength 2413 kPa (350 psi); elongation 250%
- Weight loss 4.0% after 7 days in JRF at 60 °C; no corrosion after 20 days in salt water/JRF
- No cracking or loss of adhesion at −54 °C; repairable to itself
Storage
- At least 9 months below 27 °C in unopened containers
| Packing | 6 OZ / 100 ML or 1 Pint |