3M™ Scotch-Weld™ Structural Void Filling Compound EC-3550 B/A FST is a two-part, low-density, flame-retardant epoxy compound that can be stored, applied and cured at room temperature.

Scotch-Weld EC-3550 B/A FST a non-sag, non-brittle compounds designed for void-filling, edge sealing/close-out, corner reinforcement, local reinforcement for mechanical fixation and complex gap-filling in honeycomb sandwich structures. The cured materials meet 14 CFR 25.853 (a) and Airbus Directive (ABD) 0031. 

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