3M Scotch-Weld 2216 Flexible Epoxy Adhesive for Metal Plastic and Composite Bonding

3M Scotch-Weld 2216 Flexible Epoxy Adhesive Performance

This flexible epoxy is designed to maintain dependable bond strength while accommodating movement within the assembly. Unlike highly rigid epoxy systems, its cured bond line can absorb impact and vibration, helping reduce concentrated stress around bonded components. This characteristic is valuable in transportation equipment, appliances, industrial machinery, electronic modules, construction assemblies, and components exposed to repeated thermal cycling.

3M Scotch-Weld 2216 Flexible Epoxy Adhesive also performs effectively at low temperatures and is widely recognized for cryogenic bonding applications. The product provides good retention of strength after environmental ageing and can be considered for assemblies exposed to humidity, temperature changes, and outdoor conditions after the complete bonding process has been validated.

Product Versions and Processing Options

The 3M 2216 product family is available in gray, translucent, and non-sag tan versions. The translucent grade supports applications where visual inspection of the substrate or bond area is helpful. The tan non-sag version provides improved bond-line control on vertical surfaces, while the gray grade is widely used for general structural bonding and industrial assembly.

Mixing ratio and working time depend on the selected version. Translucent products commonly use a 1:1 ratio and provide approximately 120 minutes of working time, while selected gray versions use a 2:3 ratio and offer approximately 90 minutes. Buyers should therefore confirm the exact color, package, mixing ratio, technical designation, and required application properties before ordering.

7 Benefits for Industrial Bonding Applications

• Flexible cured bond: Helps withstand vibration, impact, flexing, and thermal movement.
• High structural strength: Delivers strong peel and shear performance on correctly prepared substrates.
• Broad material compatibility: Bonds metals, plastics, wood, rubber, masonry, glass, and composites.
• Environmental durability: Retains useful strength after exposure to demanding service conditions.
• Extended working time: Allows accurate positioning and adjustment of larger components.
• Cryogenic capability: Maintains flexibility and bonding performance at very low temperatures.
• Multiple application methods: Suitable for bonding, sealing, coating, edge sealing, and potting.

Application and Curing Guidance

Clean both surfaces and remove grease, oil, moisture, dust, oxidation, release agents, and loose contamination. Abrasion may improve adhesion on selected metals and plastics when followed by appropriate cleaning. Measure the resin and accelerator according to the specified ratio for the exact product version, then mix thoroughly until the color and consistency are uniform.

Apply the mixed adhesive to one or both surfaces and assemble the parts within the available working time. Maintain correct alignment and suitable fixture pressure while handling strength develops. Full room-temperature curing typically requires approximately seven days at 22°C, although heat can accelerate the process. Cure schedules must be validated against substrate temperature limits, bond-line thickness, component mass, and production requirements.

Official Resources and Related Structural Adhesives

Review the official 3M Scotch-Weld 2216 product page and the official 3M 2216 technical data sheet for current mixing ratios, performance data, curing guidance, package options, and safety information.

Explore our flexible epoxy adhesives for additional vibration-resistant bonding products. You can also browse our industrial structural adhesives for epoxy, acrylic, polyurethane, and specialty assembly solutions. Contact our sales team for quotations, color selection, package availability, compatible dispensing equipment, technical documentation, and export support.