PPG PR-1425 Class B is an aircraft windshield and canopy sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It is designed for fillet sealing of properly prepared glass, polycarbonate, acrylic and other aircraft applications; it is formulated not to craze substrates and resists UV and weather exposure. It is a two-part, dichromate cured polysulfide, a low sag, thixotropic paste applied by extrusion gun or spatula.
Application Properties (B-2)
- Colour: A, B and mixed black; mix ratio by weight 10:100
- Base viscosity 16,000 P (1600 Pa·s); slump 5.08 mm
- Application life 2 hours; tack free under 24 hours; 30 Shore A in 48 hours
Performance
- Specific gravity 1.49; non-volatile content 93%; hardness 55 Shore A
- Dry peel: glass 222 N/25 mm, acrylic 214 N/25 mm, polycarbonate, stainless steel, titanium and aluminium 205 N/25 mm, 100% cohesive
- Acrylic and polycarbonate abraded with 220 grit and primed with PR-142 Adhesion Promoter
- No cracking or loss of adhesion at −54 °C
Storage
- At least 9 months at 5–27 °C in unopened containers; kits and Semco cartridges
| Packing | 6 OZ |