3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR

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Self-extinguishing, flame retardant adhesive passes 14 CFR 25.853 (a) Burn Test requirements

4-8 minute work life after mixing

Applies easily with convenient cartridges, resulting in minimal waste

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  • Self-extinguishing, flame retardant adhesive passes 14 CFR 25.853 (a) Burn Test requirements
  • 4-8 minute work life after mixing
  • Applies easily with convenient cartridges, resulting in minimal waste
  • 1:1 mix ratio simplifies mixing
  • Does not contain intentionally added brominated or antimony-based flame retardants

3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR is a self-extinguishing, two-part flame retardant epoxy adhesive. This adhesive meets the 14 CFR 25.853 (a) Burn Test requirements and has a work life of 4-8 minutes after mixing. It is ideal for many applications requiring a self-extinguishing structural epoxy adhesive system.

3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR is excellent for applications requiring a self-extinguishing, flame retardant epoxy adhesive on surfaces including steel, aluminum, plastics, rubber and glass. This two-part epoxy adhesive is supplied in a dual syringe plastic cartridge as part of the 3M™ EPX™ Applicator System for minimal waste and professional results. The mix ratio is 1:1 and the adhesive provides a 4 to 8 minute work life to allow time to adjust fit prior to setting. The adhesive is fully cured in 24-48 hours at 73°F (23°C).

What Are Epoxy Adhesives?
3M™ epoxy adhesives are part of the class of adhesives called "structural adhesives," which also includes polyurethane and acrylic adhesives. Epoxy adhesives are typically formulated with reactive components (Base and Accelerator) that cure when mixed to form a solid plastic material. 3M provides epoxy adhesives in multiple formats to support your processing needs:

Two Part – The 3M™ Scotch-Weld™ Epoxy Adhesive EC-3531 B/A FR is a two-part adhesive. In this format, the Base and Accelerator are stored separately which enables the adhesive to have a long shelf life even when stored at room temperature. When stored in the original, unopened container at the storage conditions suggested, this product has a shelf life of 15 months from the date of shipment from 3M. These materials are available in cartridges for use with the 3M™ EPX™ Applicator System, enabling you to simultaneously meter, mix and apply two-part adhesives. For larger scale operations, you can purchase these in bulk. Because these parts are mixed at point of use, you can reduce waste by saving non-mixed unused material for a later job.

One Part – In this format, 3M does the mixing for you and ships it frozen. You store it in a freezer, then remove and thaw it when you’re ready to use it.

Adhesive Films – In this one-part format, 3M not only does the mixing for you, but also turns it into a film that can be specifically cut to size and placed into your bond line. 3M offers a variety of films in different weights/thickness and supports. These films must be stored frozen.

In a two-part epoxy adhesive, once the two parts are mixed in their specified ratio, they begin the curing process and offer a limited working time where the adhesive can be applied and the two surfaces positioned as needed. Similarly, in a one-part adhesive there is a limited out time after which material is thawed during which it must be used. This work life or out time lasts anywhere from a few minutes to 48 hours or longer.

In general, epoxy adhesives provide high shear and peel strengths and have good environmental resistance. These adhesives are preferred for their ease of use, mechanical strength and chemical resistance. Depending on the formulation, epoxy adhesives can be flexible or rigid, transparent or opaque, quick setting or slow setting, high flow or low flow, room temperature or elevated temperature cure. Epoxy adhesives are among the strongest adhesives available, making them well-suited for jobs requiring strength and durability.

Our Best for Your Best
3M is proud to partner with organizations across the spectrum of aerospace and related industries. Enabling efficiencies, reducing process times and lowering aircraft weight is how 3M executes its never-ending mission to offer best-in-class adhesives, sealants, surface protection products and composite resins that effectively reduce costs on multiple fronts. Professionals across the industry know the numerous advantages of 3M Automotive and Aerospace Solutions. The brand is widely recognized for the highest standards of quality and performance, adding value to the final results. By engineering reliability, longevity and value into all of its products, 3M has a history of saving money by reducing waste, rework and time.

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Typical properties