3M ScotchWeld DP420 Off-White 20-Minute Toughened Epoxy Adhesive

3M Scotch-Weld DP420 Off-White is a high-performance, two-part toughened epoxy adhesive engineered for applications requiring exceptional durability and strength. It provides outstanding resistance to shear and peel forces, as well as excellent performance in the face of shock and impact. With a 20-minute work life, it allows for careful positioning of components, making it a reliable choice for demanding bonding applications where a non-black color is preferred.

Popular Applications & Uses
- Structural bonding of metals, composites, and plastics in a variety of industries.
- Assembly of components where a lighter color is needed for aesthetic reasons.
- Bonding inserts and hardware into composite parts.
- Applications in sporting goods and general manufacturing requiring high impact strength.

Industries that Commonly Use It
- General Industrial and Manufacturing
- Aerospace and Transportation
- Sporting Goods
- Medical Device Assembly

Special and Unique Features
- Provides very high shear and peel strength for robust, durable bonds.
- Toughened to resist impact, vibration, and thermal cycling.
- A 20-minute work life allows for adjustment and repositioning of parts.
- The off-white color is suitable for applications where a black bond line is undesirable.
- Cures with low shrinkage and provides good environmental resistance.

Key Properties
- Base: Epoxy
- Color: Off-White / Cream
- Mix Ratio: 2:1 by volume
- Work Life: 20 minutes
- Time to Handling Strength: 1.5 - 2 hours
- Excellent strength retention after environmental aging.

Materials Bonded
- Metals (Aluminum, Steel)
- Composites (FRP, Carbon Fiber)
- High-Performance Plastics (ABS, PC, Acrylic)
- Wood and Ceramics

Cure Information
- Mix Ratio: 2:1 by volume
- Work Life (Pot Life): 20 minutes at 73 F (23 C).
- Time to Handling Strength: Approximately 1.5 - 2 hours.
- Full Cure: 24-48 hours at room temperature.

Known backups / known substitutes for this product
- 3M Scotch-Weld DP420 Black (for applications where color does not matter)
- Loctite EA E-20HP

Araldite 2031-1

Maven EAF 420

Comparison Note
- The 3M DP420 Off-White and DP420 Black formulations offer virtually identical performance in terms of strength, toughness, and cure profile. The only significant difference is the color. The choice between them is typically based on the aesthetic requirements of the final assembled product. Like its black counterpart, it is a direct competitor to Loctite E-20HP for high-performance structural bonding.