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3M Scotch-Weld EC-3550 FST Structural Void Filling Compound 400ml Dual Cartridge

3M Scotch-Weld EC-3550 FST Structural Void Filling Compound 400ml Dual Cartridge
3M™ Scotch-Weld™ Structural Void Filling Compounds EC-3550 B/A FST (Fire Smoke Toxicity) is two-part, low-density, flame-retardant epoxy compounds that can be stored, applied and cured at room temperature.
£50.86 excl VAT
£61.03 inc VAT
No stock - lead time 17 days
UN Number: UN3077 CL9 & 3263 CL8 III/III
Commodity Code: 39073000
Bulk discounts
£50.86 + VAT
£48.32 + VAT
£47.05 + VAT
£45.77 + VAT
We can only guarantee a shelf life of 365 days for this product

Features of 3M EC-3550:

  • 100% solids.
  • Base is brown with black spots; accelerator is off-white.
  • Meets the flammability requirements of J.A.R./F.A.R. 25.853 (a).
  • Meets Airbus stand-alone FST requirement.
  • Available in duo-pack cartridges with static mixing nozzle or in bulk pumpable kits.
  • Thixotropic properties for ease of application.
  • Excellent sag resistance.
  • Scotch-Weld EC-3550 B/A FST: Sandable & machinable within twelve hours at 75°F (23°C) of mixing or 1/2 hour at 175°F (80°C).
  • Cures to a strong, low-density material within 48 hours at 75°F (24°C) or one hour at 175°F (80°C).
  • Service temperature of -65°F to 212°F (-55°C to 100°C).
  • Seals honeycomb panel edges and provides impact resistance to panel.
  • Paintable.


Scotch-Weld EC-3550 B/A FST is non-sag, non-brittle compounds designed for void-filling, edgesealing/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. Scotch-Weld 3550 B/A FST  Compounds are available in dual-chamber cartridges and bulk kits for use with pneumatic dispensers and bulk pumping equipment.

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Orders requiring Pre 10.00am Next Day delivery has also been lowered from £35.00 to £19.50** 

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