Sealing Compound, Polythioether Rubber Fast Curing for Integral Fuel Tanks and General Purpose, Intermittent Use to 360 °F (182 °C) AMS3277K

DOI: https://doi.org/10.4271/AMS3277K

Issuing Committee: AMS G9 Aerospace Sealing Committee

Publisher: SAE International

Pages: 16

Rationale: Adds Class C-12(48) and C-48(168) application times with corresponding requirements. Adds accelerated cure times for Class C. Removes Class A and B low temperature cure test requirements except for 1/4 and 1/2 application times. Changes the 14-day hardness requirement to 7 days. Updates Peel Strength requirements to include dry peels on AMS-C-27725 substrate. Clarify Low Temperature Curing and Low Temperature Tack-Free Time requirements. Added AMS2629 fuel exposure to the Low Temperature Flexibility test that was deleted in Rev. B. Changed a Tensile and Elongation 7-day heat exposure requirement from 300 °F (149 °C) to 285 °F (141 °C). Deleted Chalking as an Initial Acceptance Test. For Acceptance, Accelerated Storage, and Shelf-Life testing, changed aging of sealant in AMS2629 instead of AMS2629/3% salt water to be consistent with other Integral Fuel Tank Sealing Compound specifications.