Technical Data Sheet

3M™ Scotch-Weld™ Urethane Adhesive EC-3549 B/A NF

II. Floating Roller Peel (Bell Peel) (ASTM D3167)

Bell peel strengths were measured on 1 in. wide bonds at the temperatures noted. The testing jaw separation

rate was 6 in. per minute. The bonds were made with 0.064 in. bonded to 0.025 in. thick adherends.

III. Cure Cycle

All bonds were cured 7 days at 73°F (23°C) at 50% RH before testing or subjected to further conditioning or

environmental aging.

Handling and Application Information

Product Application

Note: This information is provided as a general application guideline based upon typical conditions. No two applications are identical

due to differing assemblies, method of heat and pressure application, production equipment and other limitations. It is therefore

suggested that experiments be run, within the actual constraints imposed, to determine optimum conditions for your specific

application and to determine suitability of product for particular intended use.

I. Surface Preparation

A thoroughly cleaned, dry, and grease-free surface is essential for maximum performance. Cleaning

methods that will produce a break-free water film on metal surfaces are generally satisfactory.

For aluminum, the best performance will be achieved with the surface preparation by alkaline

degreasing, then FPL etching according to ASTM D2674, and followed by phosphoric acid anodizing

according to ASTM D3933.

II. Directions for Use

3M™ Scotch-Weld™ Urethane Adhesive EC-3549 B/A NF is supplied in dual syringe plastic cartridges

as part of the 3M™ EPX™ Applicator System. To use the EPX cartridge system, simply insert the

cartridge into the EPX applicator. Next, remove the cartridge cap and expel a small amount of adhesive

to be sure both sides of the cartridge are flowing evenly and freely. If simultaneous mixing of Part A and

Part B is desired, attach the mixing nozzle to the -pak cartridge and begin dispensing the adhesive.

When mixing Part A and Part B manually the components must be mixed in the ratio indicated in the

typical uncured properties section of this data sheet.

Complete mixing of the two components is required to obtain optimum properties.

Shelf Life and Storage Conditions

3M™ Scotch-Weld™ Urethane Adhesive EC-3549 B/A NF shelf life is 12 months from the date of shipment from 3M

when stored between 60° to 80°F (15° to 27°C) in the original unopened container.

Additional Information

In the U.S. call toll free 1-800-235-2376, or fax 1-800-435-3082 or 651-737-2171. For U.S. Military, call 1-866-556-5714. If you are

outside of the U.S., please contact your nearest 3M representative.