PS 870 C-48

PPG PS 870 Class C 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 designed for roller and faying surface sealing. Tests are run to MIL-PRF-81733 Type IV and OEM specification methods.

Application Properties (C-48)

• Colour: A black, B white, mixed grey; mix ratio by weight 17:100
• Base viscosity 2500 P (250 Pa·s)
• C-48: application life 48 hours; assembly time 168 hours; 30 Shore A in 56 days

Performance

• Specific gravity 1.50; non-volatile content 90%; hardness 50 Shore A; soluble chromate 4%
• Peel: 93–116 N/25 mm after JRF, 111–116 N/25 mm after JRF/3% salt water, 100% cohesive
• Tensile strength 1724 kPa (250 psi); elongation 250%; lap shear on BMS 10-11 epoxy primer 1601 kPa
• 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