PPG PS 870 Class A is a corrosion inhibitive sealant. Service temperature is −54 to 121 °C, with intermittent excursions up to 135 °C. It is an effective barrier against the common causes of corrosion on aluminium alloys and between dissimilar metals, and maintains elastomeric properties after limited exposure to jet fuel and aviation gasoline. It is a two-part, manganese dioxide cured polysulfide applied by brush in thicknesses up to 25 mils. Tests are run to MIL-PRF-81733 Type I methods.
Application Properties (A-2)
- Colour: A black, B white, mixed grey; mix ratio by weight 15:100
- Base viscosity 300 P (30 Pa·s)
- Application life 2 hours; tack free under 24 hours; 30 Shore A in 64 hours
Performance
- Specific gravity 1.45; non-volatile content 86%; hardness 50 Shore A; soluble chromate 4%
- Peel: 125–129 N/25 mm after JRF, 133–138 N/25 mm after JRF/3% salt water, 100% cohesive
- Tensile strength 1724 kPa (250 psi); elongation 250%
- No corrosion after 670 hours salt fog (ASTM B117); no cracking or loss of adhesion at −54 °C
Storage
- At least 6 months below 27 °C in unopened containers; kits and Semco cartridges
| Packing | 6 OZ or 1 Pint |