PR-1776M Class B Overview
PR-1776M Class B is a low density, high-temperature aircraft integral fuel tank sealant. It has a service temperature range from -65°F (54°C) to 250°F (121°C), with very limited excursions up to 360°F (182°C). This material is designed for fillet sealing of fuel tanks and other 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 Permapol® 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.