PPG PS 895 Class B is an aerodynamic smoothing sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It is designed for sealing aircraft structures and pressurized cabins and for depression filling and smoothing applications, and maintains elastomeric properties after prolonged exposure to jet fuel and aviation gasoline. It is a two-part, manganese dioxide cured polysulfide, a low sag, thixotropic paste applied by extrusion gun or spatula. Tests are run to MIL-S-38228 Class B methods.
Application Properties (B-1/2)
- Colour: A black, B silver grey, mixed silver grey; mix ratio by weight 10:100
- Base viscosity 15,000 P (1500 Pa·s); slump 1.27 mm
- B-1/2: application life 1/2 hour; tack free under 8 hours; 30 Shore A in 24 hours
Performance
- Specific gravity 1.56; non-volatile content 97%; hardness 50 Shore A
- Peel: 107–111 N/25 mm after JRF, 120–125 N/25 mm after JRF/salt water, 100% cohesive
- Tensile strength 2069 kPa (300 psi); elongation 300%; 2758 kPa after 7 days at 121 °C
- Weight loss 5.5% 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 | 1 Pint |