PPG PS870B-2 (500-ml-Kit)

P/S 870 Class B Corrosion Inhibitive Sealant

P/S 870 Class B is a corrosion inhibitive aircraft sealant with a service temperature range of -65°F (-54°C) to 250°F (121°C), with intermittent resistance up to 275°F (135°C). It acts as an effective barrier against common corrosion mechanisms on aluminum alloys and dissimilar metals. Once cured, the material maintains elastomeric properties after limited exposure to jet fuel and aviation gasoline.

This product is a two-part, manganese dioxide–cured polysulfide compound. The uncured sealant is a low-sag, thixotropic paste that can be applied by extrusion gun or spatula. It cures at room temperature to form a resilient, durable seal with excellent adhesion to typical aircraft substrates. All tests referenced meet MIL-PRF-81733 Type II standards.

Application Properties (Typical)

• Color: Part A Black, Part B White, Mixed Gray
• Mixing Ratio (By weight): 17:100 (Part A : Part B)
• Base Viscosity (Brookfield #7 @ 2 rpm): 11,000 Poise (1,100 Pa·s)
• Slump, inches (mm):
  • B-1/2: 0.15 (3.81)
  • B-2: Initial 0.10 (2.54), 50 min 0.15 (3.81), 90 min 0.15 (3.81)
  • B-4: Initial 0.10 (2.54), 50 min 0.10 (2.54), 90 min 0.15 (3.81)
• Application Life & Cure Time @ 77°F (25°C), 50% RH:
  • B-1/2: Life 0.5 hr, Tack-free <4 hrs, 30A hardness 9 hrs
  • B-2: Life 2 hrs, Tack-free <14 hrs, 30A hardness 20 hrs
  • B-4: Life 4 hrs, Tack-free <32 hrs, 30A hardness 72 hrs

Performance Properties (Typical)

• Cured 14 days @ 77°F (25°C), 50% RH:
  • Specific Gravity: 1.48
  • Nonvolatile Content: 95%
  • Ultimate Cure Hardness: Durometer A 50
  • Soluble Chromate: 4%
• Peel Strength — 100% Cohesion:
  • MIL-A-8625 Anodized Aluminum — 30 pli (133 N/25 mm)
  • MIL-T-9046 Titanium Comp. C* — 29 pli (129 N/25 mm)
  • After NaCl-H2O immersion: Aluminum 32 pli (142), Titanium 31 pli (138)
  • *Primed with PR-148 Adhesion Promoter
• Tensile Strength: 358 psi (2470 kPa)
• Elongation: 400%
• Low Temperature Flexibility: No cracking at -65°F (-54°C)
• Hydrocarbon Resistance: 7 days @ 140°F (60°C) in Type III fuel; weight loss 6.0%
• Mandrel Bend: No cracking after 180° bend over 0.125 inch (3.18 mm)
• Repairability: Excellent on fresh, fuel-aged, and abraded fillets
• Salt Spray (ASTM B117, 670 hrs): No corrosion or sealant degradation
• Fungus Resistance: Non-nutrient

Surface Preparation

Before applying P/S 870 Class B to primed substrates, clean surfaces thoroughly using approved solvents and lint-free AMS 3819 cloths. Remove contaminants such as oil, dirt, and lubricants. Avoid using reclaimed solvents or tissue paper. Always wet the cloth with solvent rather than dipping it to prevent contamination. Wipe one small area at a time and dry before evaporation to prevent contaminant redeposition.

Because substrates vary, adhesion testing is recommended prior to full-scale application. For more detailed procedures, refer to SAE AIR 4069.

Packing Options

P/S 870 Class B is available in:

• Two-part kits
• Semco® cartridges
• Pre-mixed and frozen cartridges

Mixing Instructions

Mix Part A and Part B separately to ensure uniformity. Combine the full contents of both parts and mix thoroughly, ensuring no unmixed material remains on container walls or bottom. Follow the specified weight ratio precisely.

Storage Life

• Standard Packaging: At least 9 months below 80°F (27°C)
• Pre-mixed & Frozen: At least 30 days at -40°F (-40°C)

Health and Safety

This product is safe when used according to recommended guidelines. Review the Material Safety Data Sheet (MSDS) before use for health, environmental, and first-aid information. Use proper PPE, avoid overexposure, and seek medical attention in severe cases. Industrial use only — keep away from children.