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P/S 870 Class B 1/2 Corrosion Inhibitive Sealant



P/S 870 Class B 1/2 Corrosion Inhibitive Sealant

P/S 870 Description

It has a service temperature range from -65°F (-54°C) to 250°F (121°C). with intermittent excursions up to 275°F (135°C). This material acts as an effective barrier against the common causes of corrosion on the aluminium alloys or between dissimilar metals. The cured sealant maintains elastomeric properties after limited exposure to both jet fuel and also aviation gas.

P/S 870 Class B is a two-part, manganese dioxide cured polysulfide compound. The uncured material is a low sag, and also thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.


  • Boeing Specification: BMS 5-95 Type I Class B-1/2
  • US Military Specification: MIL-S-81733 Type II, and also Class 1 Grande A
  • Lastly, US Military Specification: MIL-PRF-81733 Type II, Class 1 Grande A

Storage Life

Lastly, The storage life of PS-870 Class B is at least 6 months when stored at temperatures below 80°F (27°C) in original unopened containers.


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