021200-65223 - 3M Scotch-Weld Urethane Adhesive EC-3549 B/A

The 3M Scotch-Weld Urethane Adhesive EC-3549 B/A is a two-part, room-temperature curing polyurethane adhesive engineered to form tough, high-peel-strength structural bonds.3 Its formulation is designed for impact resistance and long-term durability across various challenging environments, making it a versatile choice for bonding dissimilar materials.4The $\mathbf{B/A}$ designation confirms it is a two-component product where the Base (Part B) and Accelerator (Part A) are mixed 1:1 by volume.

Key Features

• Impact Resistant: The cured urethane is known for its flexibility and ability to absorb shock and vibration, providing a more durable bond than many rigid epoxies.
  
• High Peel Strength: Provides a strong, durable bond that resists peeling forces, essential for structural panel and composite assemblies.
  
• Sag-Resistant: Designed to develop sag resistance approximately 30 seconds after mixing, ensuring precise handling and application on vertical or overhead surfaces.
  
• Versatile Substrate Adhesion: Excellent bond strength to many primed or painted metals and a wide variety of plastics, wood, and composites.
  
• Cure Flexibility: Cures reliably at room temperature, but the cure time can be accelerated with heat.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization). Returns without prior notice or written authorization will not be accepted.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.