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3M™ Scotch-Weld™ Structural Adhesive EC-3984

Part Number EC-39843M Product Number EC-39843M ID 62398465401
  • Excellent strength from -67°F (-55°C) to 300°F (149°C)
  • One-part formula for easier spray application of the adhesive
  • Viscosity minimizes blockage on perforated acoustic components
  • Formulated to permit low pressure bonding
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Specifications
Attribute Name
Value
Adhesive Type
Epoxy
Application
Composite Bonding, Metal Bonding, Metal to Composite Bonding
Brand
Scotch-Weld™
Color
Blue
Composition
Solvent Based
Cure Rate
1 Hour
Cure Temperature
250 Degree Fahrenheit
Density
0.88 g/cc
Percent Volatile
75-85 Percent
Shelf Life
6 Month
Storage Environment
Freezer Storage
Product Details
  • Excellent strength from -67°F (-55°C) to 300°F (149°C)
  • One-part formula for easier spray application of the adhesive
  • Viscosity minimizes blockage on perforated acoustic components
  • Formulated to permit low pressure bonding
  • High and low temperature performance provides high structural strength at elevated temperatures

We offer 3M™ Scotch-Weld™ Structural Adhesive EC-3984 as a version of 3M™ Scotch-Weld™ Structural Adhesive Film AF 3109-2 in a sprayable liquid form. It delivers excellent performance up to 300°F (149°C). Our adhesive is commonly used for bonding wire mesh on engine nacelles, thrust reversers, and acoustic panels for aircraft and aircraft engines.

3M™ Scotch-Weld™ Structural Adhesive EC-3984 combines the strength and performance of our 3M™ Scotch-Weld™ Structural Adhesive Film AF 3109-2 with the convenience and efficiency of a spray for precise coating requirements or to cover larger areas economically and effectively. Our sprayable formula can be used to hold screens or other components in place that need structural adhesive strength at elevated temperatures. Ideal for bonding wire mesh on engine nacelles, thrust reversers, and acoustic panels for aircraft and aircraft engines, this adhesive delivers reliable performance in temperatures up to 300°F (149°C). 3M Scotch-Weld™ Structural Adhesive EC-3984 can be cured at temperatures as low as 225°F (107°C) and up to up to 350°F (177°C). This variable cure rate combined with the film's easy handling gives you flexibility to design efficient processes.

Epoxy adhesive applied to large aluminum honeycomb panels for structural bonding
3M Aerospace adhesives combine high mechanical strength with excellent durability
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 — 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. These materials are available in a duo-pak 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, we do the mixing for you and ship 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, we not only do the mixing for you, but we also turn it into a film that can be specifically cut to size and placed into your bond line. We offer 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 we execute our 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 Aerospace. Our 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 our products, we have a history of saving money by reducing waste, rework and time.

Learn More about 3M Interior Adhesive Solutions (PDF, 14.96 Mb)

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