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3M™ Scotch-Weld™ Structural Epoxy Adhesive EC-7246-2 B/A FST

Part Number 7246-23M Product Number 7246-2
Products
  • Excellent adhesion to a wide variety of substrates such as metals, ceramics and plastics
  • Thixotropic, non-sag formulation makes it easy to apply without dripping or deformation
  • 2:1 mix ratio simplifies mixing
  • 90 minute work time allows for positioning and adjusting for fit prior to setting
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Specifications
Attribute Name
Value
Adhesive Type
Epoxy
Application
Insert Potting, Metal Bonding, Metal to Composite Bonding, Structural Bonding
Brand
Scotch-Weld™
Color
Off white
Cure Rate
7 days
Cure Temperature
Room Temperature
Flame Retardant
FST
Meets Specifications
14 CFR-25.853(a)(d), ABD-0031
Storage Environment
Room Temperature
Time to Handling Strength
5 Hours
Worklife
90 minutes @ Room Temperature
Product Details
  • Excellent adhesion to a wide variety of substrates such as metals, ceramics and plastics
  • Thixotropic, non-sag formulation makes it easy to apply without dripping or deformation
  • 2:1 mix ratio simplifies mixing
  • 90 minute work time allows for positioning and adjusting for fit prior to setting
  • Ideal for bonding interior sidewall panels, cargo bay panels, bar units, coatrooms and passenger doors
  • Flexible to withstand vibration
  • Outstanding environmental performance
  • High peel and shear strength for strong bonds in critical applications
  • Meets several industry fire, smoke and toxicity requirements

3M™ Scotch-Weld™ Structural Epoxy Adhesive 7246-2 B/A FST is a two component epoxy adhesive which cures at room temperature or with mild heat to form a strong structural bond with impact resistance. It has an excellent adhesion to a wide variety of substrates such as metals, ceramics and plastics, including GFRP and CFRP. The adhesive meets several fire, smoke and toxicity requirements.

Epoxy adhesive applied to large aluminum panels for structural bonding
Combines high mechanical strength with excellent durability
3M™ Scotch-Weld™ Structural Epoxy Adhesive 7246-2 B/A FST is a two component epoxy adhesive which cures at room temperature or with mild heat to form a strong structural bond with impact resistance. It has an excellent adhesion to a wide variety of substrates such as metals, ceramics and plastics, including GFRP and CFRP. Once cured it provides extremely high mechanical strength over a wide temperature range, with excellent resistance to harsh environments and chemicals. Scotch-Weld adhesive 7246-2 B/A FST simplifies many aircraft interior manufacturing tasks by allowing builders to complete assembly and FST (Fire, Smoke, Toxicity) compatibility operations in a single step. The versatile product could also replace several different types of conventional adhesive, simplifying stocking requirements and improving productivity.

3M™ Scotch-Weld™ Structural Epoxy Adhesive 7246-2 B/A FST is designed for honeycomb sandwich constructions typically found in aircraft interiors such as galley structures, luggage bins, partition walls, lavatory structures, crew rest compartments, seating structures, ceiling panels, closets, stowage compartments, sidewall panels, cargo bay panels, bar units, coatrooms and passenger doors. Its thixotropic, non-sag formulation makes it easy to apply without dripping or deformation. The adhesive allows completed assemblies to meet FST requirements without additional surface treatment. The epoxy adhesive is light tan in color to match conventional honeycomb skin materials, and can be over painted using the same surface coatings as the panels without leaving unsightly shadows.

Scotch-Weld adhesive 7246-2 B/A FST has a typical worklife of 90 minutes and reaches handling strength in three to four hours under the same conditions. It is available in a cartridge for simple, accurate application or in bulk containers for hand mixing or use with automated mixing equipment. This structural adhesive is compatible with most common aerospace interior substrates including aluminum honeycomb, polycarbonate, glass/phenolic panels, polyetherimide and polyphenylsulfone, It is resistant to damage by water, salt spray, jet fuel and mineral oils.

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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