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3M™ Scotch-Weld™ Structural Void Filling Compound EC-3550 B/A FST (Fire Smoke Toxicity) is an advanced technology compound developed to help cut production cost and time, reduce weight and address safety regulations governing aircraft interiors. Our lightweight, low density product helps eliminate process steps, reduces worker touch time and speeds throughput compared to hand mixing and applying.
Customers Talk, We Listen
You told us you needed a product that combined ease of use and superior performance. 3M™ Scotch-Weld™ Structural Void Filling Compound EC-3550 B/A has the combination of superior extrudability, low density that is easy to apply and finish for fast, professional results. And its stand-alone fire, smoke and toxicity performance provides the confidence of using the right product in the right place.
Less touch time means less cycle time. Our specially engineered low density flame-retardant formula, EC-3550 B/A FST offers complex gap filling and simplifies other applications for faster and more economical performance. EC-3550 B/A FST offers a unique combination of easy “dispense-ability” and non-sag performance, resulting in a number of productivity-enhancing advantages.
Fast, Direct Application
EC-3550 B/A FST is extrudable and pumpable. It reduces or eliminates hand troweling, avoiding the trapped air that results in pinholes, voids and porosity while reducing product waste. EC-3550 is ideal for filling edges in honeycomb sandwich construction for galleys, luggage bins, partition walls, lavatories, seating, ceiling panels, floorboards and passenger doors.
Non-Brittle, Non-sag Material
EC-3550 B/A FST is easier to handle and resists chip-outs and breakouts when cured. Its non-sag property allows application to multiple work pieces at one time. In addition, this compound exhibits good paint retention and adhesive bond strength.
Put a Freeze on Inventory Cost
Our shelf-stable formula requires no freezer storage. It costs less to store and can be closer to the work when needed. In aircraft manufacture and MRO, time is money so we made EC-3550 B/A FST fast and easy to use. Depending on cure methods, EC-3550 B/A FST can be sanded and machined within 6 to 12 hours and help reduce cycle times.
Science Applied to Common Sense
The versatile formula also helps meet a variety of requirements in aircraft manufacture and MRO. Our aerospace-minded chemists and engineers teamed up to create this non-sag, non-brittle compound for void-filling, edge sealing/close-out, corner reinforcement, local reinforcement for mechanical fixation and complex gap-filling in honeycomb sandwich structures. It carries stand-alone FR/FST compliance and is non-halogenated and antimony free. EC-3550 offers excellent water and chemical resistance and professional, void-free results.
Packaging Options to Meet the Need
3M™ Scotch-Weld™ Structural Void Filling Compound EC-3550 B/A FST is available in dual-chamber cartridges for precise application and dispensing. Our 400ml cartridges and 60L bulk kits are ideal for use with pneumatic dispensers and bulk pumping equipment, respectively.
Our Best for Your Best
3M is proud to partner with organizations across the spectrum of aerospace and related industries. Creating efficiencies, reducing process times and lowering aircraft weight is how we execute our never-ending mission to offer best-in-class adhesives, sealants and other products that effectively reduce costs on multiple fronts. Professionals across the industry know the cost-saving advantages of 3M Aerospace. Our brand is widely recognized for the highest standards of quality and performance and adds value to the final results. By engineering reliability, longevity and performance into all of our products, we have a history of saving money by reducing waste, rework and time.
3M maintaints partnerships with every major aircraft OEM in the world. Find your spec today.
Safety Data Sheets
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Regulatory Data Sheet
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