3M EC2216 B-A Aerospace High Performance Flexible Cold-Resistant Shock Resistant 90-Minute Set Epoxy

3M EC2216 B/A is a flexible, two-part epoxy adhesive that cures at room temperature. It is renowned for its exceptional performance in extreme conditions, particularly its ability to maintain high peel and shear strength over a wide temperature range, including cryogenic temperatures. Its flexibility makes it ideal for bonding dissimilar surfaces and applications requiring high shock, vibration, and impact resistance.

Popular Applications & Uses
- Bonding panels, brackets, and components in aircraft and aerospace manufacturing.
- Applications requiring performance at cryogenic temperatures, such as in scientific instruments or liquefied gas systems.
- Bonding dissimilar materials with different coefficients of thermal expansion (e.g., metal to plastic).
- Potting and encapsulating electronic components that are sensitive to shock and thermal cycling.
- General industrial bonding where flexibility and high environmental resistance are critical.

Industries that Commonly Use It
- Aerospace and Aviation
- Defense and Military
- Specialty Vehicle and Transportation
- Electronics and Scientific Instrumentation
- General Industrial and Metalworking

Special and Unique Features
- Outstanding performance at low temperatures, retaining flexibility and strength down to -423 F (-253 C).
- High peel strength and flexibility provide excellent shock, vibration, and impact resistance.
- The long work life (90 minutes) allows ample time for positioning and adjusting large or complex parts.
- The base and accelerator are color-contrasting (off-white and gray) to provide a visual indicator of a proper mix.
- Low viscosity ensures easy mixing and application.

Key Properties
- Base: Epoxy
- Color: Gray when mixed
- Mix Ratio: 2:3 by volume (Base to Accelerator)
- Work Life: 90 minutes at 75 F (24 C)
- T-Peel Strength: 25 piw (pounds per inch of width)
- Overlap Shear Strength (at 75 F): 3200 psi

Materials Bonded
- Metals: Aluminum, Steel, and many other common metals.
- Plastics: A wide variety of plastics (testing is recommended).
- Rubber (Neoprene, Nitrile)
- Wood and Glass
- Masonry

Cure Information
- Mix Ratio: 2:3 by volume or 100:135 by weight (Base to Accelerator).
- Work Life (Pot Life): 90 minutes for a 100g mass.
- Time to Handling Strength: 8-12 hours at 75 F (24 C).
- Full Cure: 7 days at 75 F (24 C).
- Cure can be accelerated with heat; for example, 30 minutes at 200 F (93 C).

Known backups / known substitutes for this product
- Loctite EA 9309.3NA AERO (Hysol EA 9309)
- Huntsman Araldite 2011

Comparison Note
- 3M EC-2216 is distinguished by its extreme low-temperature performance and flexibility, making it a go-to choice for cryogenic applications and bonding dissimilar materials. Loctite EA 9309 and Araldite 2011 are also high-performance, toughened adhesives used in aerospace and industrial applications. However, EC-2216's specific formulation gives it a unique advantage in applications demanding flexibility and performance in severe cold, while other epoxies might offer higher strength at room temperature but become brittle in the cold.