PR-1776M Fuel Tank Sealant

PR-1776M Fuel Tank Sealant, 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 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 Fuel Tank Sealant, 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.

PACKAGING OPTIONS: PR-1776M Fuel Tank Sealant, Class B is available in the following application life B 1/2 (1/2 hour), B2 (2 hours), B4 (4 hours) and B6 (6 hours) in a two-part Semkit package, two-part can kit and a pre-mixed and frozen cartridge.
MIXING INSTRUCTIONS: Mix according to the ratios indicated in the application properties section. Mix Part A and Part B separately to uniformity, then thoroughly mix entire contents of both parts of the kit together taking care to avoid leaving unmixed areas around the sides or bottom of the mixing container. 
PR-1776M Class B is designed to be a direct replacement for PR-1776 Class B
Storage Life: The standard storage life of PR-1776M Class B in a Semkit package or can kit is at least 9 months when stored at temperatures between 40℉ (4.5℃) and 80℉ (27℃) in original, unopened containers.  The storage life of PR-1776M Class B pre-mixed and frozen cartridges is 28 days when stored at temperatures of -40℉ (-40℃) or below.

Safety Precautions: Comply with all local safety, disposal and transportation regulations. Check the Safety Data Sheet (SDS) and label of the individual products carefully before using the products. SDS’s are available on request.

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Label Value
Boeing BMS 5-4
*Ensure all required specifications are listed when requesting a quote or placing an order, as not all specifications are tested at the time of production.


Title File
Technical Data Sheet Download