3M Scotch-Weld DP2216 & 2216 B-A Gray - High Performance Flexible Cold-Resistant Shock Resistant 90-Minute Set Epoxy

3M Scotch-Weld 2216 is a flexible, two-part epoxy adhesive known for its exceptional performance in extreme conditions, particularly its ability to maintain high peel and shear strength at very low temperatures. Its long work life and flexible cure make it ideal for bonding dissimilar surfaces and applications requiring high shock and vibration resistance. This adhesive is the same formula whether sold in bulk cans (as EC-2216 or 2216 B/A) or in Duo-Pak cartridges (DP2216).

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.
- Available in various packaging, including Duo-Pak cartridges (DP2216) for easy metered dispensing.
- Good resistance to weathering and aging.

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
- 3M Scotch-Weld EC-2216 (bulk version of the same product)
- Loctite EA 9309.3NA AERO (Hysol EA 9309)
- Huntsman Araldite 2011

Comparison Note
- The 3M adhesive formula 2216 is sold under different product numbers based on its packaging. DP2216 refers to the Duo-Pak cartridge system for easy application with a dispensing gun, while EC-2216 or 2216 B/A refers to the same adhesive supplied in bulk cans. Functionally, it competes with other tough, flexible epoxies like Loctite EA 9309, but 2216's defining characteristic is its superior performance and flexibility in cryogenic conditions.