3M™ Scotch-Weld™ Structural Void Filling Compound EC-3505 B/A FR is a two-part, low-density, flame-retardant epoxy compound that is stored, applied and cured at room temperature for significant savings in handling and inventory costs. Its extrudable, pumpable and non-sag performance helps aircraft manufacturers eliminate steps through reduced touch and cycle times.
We formulated 3M™ Scotch-Weld™ Structural Void Filling Compound EC-3505 B/A FR to be non-sagging and non-brittle. This helps make it an ideal solution for void-filling, edge-sealing/close-out, corner reinforcement, local reinforcement for mechanical fixation and complex gap-filling in honeycomb sandwich structures. EC-3505 B/A FR starts as a high viscosity, thixotropic paste for easy, controlled dispensing that won't drip, sag or migrate. The mix ratio is 2:1 and provides a 60 minute work life to allow plenty of time to adjust fit prior to setting. EC-3505 B/A FR provides a four hour time window to reach handling strength and becomes fully cured in 48 hours at room temperature.
To help meet stringent standards for aerospace manufacture and maintenance flammability requirements (FR), the cured materials are designed to meet key industry fire retardancy regulations. Scotch-Weld EC-3505 B/A FR Compound is available in dual-chamber cartridges and bulk kits for use with pneumatic dispensers and bulk pumping equipment to meet needs small and large.
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-3505 B/A FR has the combination of superior extrudability, low density that is easy to apply and finish for fast, professional results. And its fire retardancy 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-3505 B/A FR offers complex gap filling and simplifies other applications for faster and more economical performance EC-3505 B/A FR offers a unique combination of easy "dispense-ability" and non-sag performance, resulting in a number of productivity-enhancing advantages.
Fast, Direct Application
EC-3505 B/A FR can be hand-mixed. It reduces or eliminates hand troweling and trapped air that helps eliminate pinholes, voids and porosity. EC-3505 B/A FR is ideal for filling edges in honeycomb sandwich construction for galleys, luggage bins, partition walls, lavatories, seating, ceiling panels, floorboards and passenger doors.
Fast-Cure, Non-Brittle, Non-Sag Material
EC-3505 B/A FR 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 exhibitsgood paint retention and adhesive bond strength.
Ready to Sand
At a room temperature of 75°F (24°C), this compound is sandable and machinable within 6 hours of mixing to keep processes moving forward. 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-3505 B/A FR fast and easy to use. Our shelf-stable formula requires no freezer storage.
Packaging Options to Meet the Need
3M™ Scotch-Weld™ Structural Void Filling Compounds EC-3505 B/A FR is available in a variety of kit sizes ideal for myriad applications and needs.
Learn More about 3M Scotch-Weld™ Structural Void Filling Compounds (PDF, 2.68 MB)
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.