PPG PS870C-12 (1-ea-S654)
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Information
Description
P/S 870 Class C is a corrosion inhibitive, two-part manganese dioxide–cured polysulfide sealant designed for fuselage and roller/faying surface sealing applications. It maintains excellent elastomeric properties over a temperature range of -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 275°F (135°C). This material provides a reliable barrier against corrosion on aluminum alloys and between dissimilar metals.
Benefits
- Corrosion inhibitive for critical aircraft components
- Excellent adhesion to common aircraft substrates
- Resilient elastomeric properties even after limited fuel exposure
- Low-sag paste designed for roller and faying surface sealing
- Durable performance across wide temperature ranges
- Repairable to fresh and aged sealant
Technical Data
- Color (mixed): Gray
- Mix ratio (A:B by weight): 17:100
- Base viscosity: 2,500 poise (Brookfield #6 @ 2 rpm)
- Cure time (hours/days): B-12 = 14 days, B-24 = 21 days, B-48 = 56 days
- Cured specific gravity: 1.50
- Nonvolatile content: 90%
- Ultimate hardness: 50 Shore A
- Tensile strength: 250 psi (standard cure, 14 days)
- Elongation: 250%
- Low temperature flexibility: No cracking at -65°F (-54°C)
- Hydrocarbon resistance: Excellent after 7 days @ 140°F (60°C)
- Weight loss: 7%
- Salt spray resistance: 670 hrs. ASTM B117, no corrosion or sealant deterioration
- Lap shear strength (100% cohesion): 232–250 psi depending on substrate and conditions
Application
- Fuslage sealing and roller/faying surface applications
- Aircraft maintenance and OEM assembly use
- Works on anodized aluminum, titanium, and other aerospace substrates
Surface Preparation
Clean surfaces thoroughly with approved solvents and lint-free cloths. Remove all dirt, grease, or processing lubricants. Dry surfaces completely before application to prevent contamination.
Mixing Instructions
Mix Part A and Part B separately to uniformity, then combine per specified ratio. Thoroughly blend to avoid unmixed areas, and apply using a spatula or extrusion gun.
Packing Options
Supplied in two-part kits and Semco® cartridges.
Storage Life
Minimum 6 months when stored below 80°F (27°C) in original, unopened containers.
Notes
- Adhesion may vary depending on substrate composition; testing is recommended.
- Results may vary slightly due to environmental or processing conditions.
- For industrial use only; follow MSDS safety precautions.
Restrictions
Recommended Alternatives
Shipping Information
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