PPG PR-1772 Class B is a low weight fuselage sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It offers as much as 30% weight savings per unit volume over traditional sealants used for these purposes, and maintains elastomeric properties after limited exposure to jet fuel and aviation gasoline. It is a two-part, chemically curing polysulfide, a low sag, thixotropic paste applied by extrusion gun or spatula that cures at room temperature. Tests are run to Boeing BMS 5-142 Class B methods.
Application Properties (B-2)
- Colour: A black, B off-white, mixed dark brown; mix ratio by weight 10:100
- Base viscosity 9000 P (900 Pa·s); slump 3.81 mm
- B-2: application life 2 hours; tack free under 6 hours; 30 Shore A in under 10 hours
Performance
- Specific gravity 1.09; non-volatile content 91%; hardness 45 Shore A
- Peel (14 day cure, aluminium, stainless steel, titanium, BMS 10-11 and BMS 10-60 coatings) 120–169 N/25 mm, 100% cohesive
- Tensile strength 1311 kPa (190 psi); elongation 280%
- No corrosion, adhesion loss or blistering after 7 days in JRF at 49 °C; weight loss 4.9%
Storage
- At least 9 months at 4–32 °C in unopened containers
| Packing | 6 Oz |