3M™ Scotch-Weld™ Epoxy Adhesive EC-2216 B/A

Part Number EC-22163M Product Number EC-2216
  • 2:3 mix ratio simplifies mixing
  • 90 minute work time allows for positioning and adjusting for fit prior to setting
  • Available in bulk or duo-pak cartridges
  • Flexible to withstand vibration
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Container Size (Imperial)
Product Color
Products Available
Available options:
 Container Size (Imperial) and Product Color
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Attribute Name
Adhesive Type
Composite Bonding, Erosion Protection, Metal Bonding, Metal to Composite Bonding, Structural Bonding
Chemical Base
Color Family
Gray, Multi-color
Container Size (Imperial)
1 Gallon, 1 Pint, 1 Quart, 1.6 Liter, 1.69 fl oz (US), 2 Ounce, 6 Ounce
Container Size (Metric)
0.47 Liter, 0.95 Liter, 170.1 g, 3.79 Liter, 50 ml, 56.7 g
Cure Rate
7 days
Cure Temperature
Room Temperature
1.3 g/cc, 1.3 Gram Per Litre
National Stock Number
8040001450432, 8040001450530
Percent Volatile
0.06 Percent
Product Color
Gray, White
Product Form
Shelf Life
24 Month
Storage Environment
Room Temperature
Time to Handling Strength
8 - 12 Hours
100 g: 90 min @ 75 °F (24 °C)
  • 2:3 mix ratio simplifies mixing
  • 90 minute work time allows for positioning and adjusting for fit prior to setting
  • Available in bulk or duo-pak cartridges
  • Flexible to withstand vibration
  • Outstanding environmental performance
  • High peel and shear strength for strong bonds in critical applications
  • Excellent for creating bonds that can be used at cryogenic temperatures
  • Widely used for composite laminate edge sealing

Our 3M™ Scotch-Weld™ Epoxy Adhesive EC-2216 B/A Gray is a flexible, two-part, room-temperature curing epoxy adhesive that provides high shear and peel strength, making this an ideal adhesive for the most demanding aerospace applications. It maintains bond strength at low temperatures and stands up to challenging environmental conditions.

Epoxy adhesive applied to aluminum honeycomb panels for structural bonding
When bonding honeycomb to aluminum, note the large bonding area where the honeycomb will be firmly seated in the adhesive
You can use this high-performance epoxy adhesive to replace mechanical fasteners, screws, rivets and spot welds. 3M™ Scotch-Weld™ Epoxy Adhesive EC-2216 B/A Gray is excellent for bonding a variety of substrates such a metals and many plastics. It can be dispensed in duo-pak cartridges for use with the 3M™ EPX™ Applicator System for minimal waste and professional results. The mix ratio is 2:3 and the adhesive provides a 90 minute work life to allow time to adjust fit prior to setting. The adhesive reaches handling strength in approximately 12 hours and is fully cured in 7 days (at 72° F /22° C), but can be accelerated with heat. This epoxy is excellent for creating bonds that can be used at cryogenic temperatures. It's widely used for composite laminate edge sealing.

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.