PR-1776M Class B is a low density, high temperature aircraft integral fuel tank sealant.
UN Number: UN3082 CL9 III
- It has a service temperature range from -65Â°F (-54Â°C) to 250Â°F (121Â°C), with very limited excursions up to 360Â°F (182Â°C).
- This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. It offers as much as a twenty percent weight savings, per unit volume, over traditional sealants used for these purposes.
- The cured sealant maintains excellent elastomeric properties after prolonged exposure to aircraft fuels both jet fuel and aviation gas, and will resist limited contact to diphosphate ester based hydraulic fluids.
- PR-1776M Class B is a two-part, manganese dioxide cured PermapolÂ® P-5 modified polysulfide. The uncured material is a low sag, 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. PR-1776M Class B is designed to be a direct replacement for PR-1776 Class B.
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