3M ScotchWeld DP420 NS (NonSag) Black 20-Minute Toughened Epoxy Adhesive

Product Name

3M Scotch-Weld DP420 NS (NonSag) Black 20-Minute Toughened Epoxy Adhesive

Brief Description

3M Scotch-Weld DP420 NS is a black, two-part, toughened, non-sag epoxy structural adhesive known for its high strength, impact, and fatigue resistance. It is engineered to replace mechanical fasteners in many demanding applications, providing durable bonds that withstand challenging environmental conditions.

Popular Applications & Uses

- Small joint assembly- Heavy-duty mounting assembly- Metalworking- Carbon fiber epoxy bonding- Joining, gluing, potting, panel bonding, and structural bonding- Replacing mechanical fasteners, screws, rivets, and spot welds- Bonding components in crash-zone repair or wind turbine blades- Bonding electronic, optical, and medical components

Industries that Commonly Use It

- Aerospace/Defense- Automotive Service/Repair- Construction/ Building Services- Electrical Services or Products- Fabrication- General Manufacturing- Marine- Medical Device/ Prosthetics- Metal Fabrication- Plastic Fabrication- Transportation/ Specialty Vehicle

Special and Unique Features

- Toughened for high impact and fatigue resistance- Non-sag (no-drip) formulation, ideal for vertical and overhead applications- Maintains bond strength at high and low temperatures- Withstands paint bake operations up to 400°F (204°C) for 60 minutes- High peel and shear strength- 20-minute work life provides ample time for positioning and adjustment- UL 94 HB flammability standard certified

Key Properties

- Type: Two-part epoxy adhesive- Color: Black- Mix Ratio (Volume): 2:1 (Base:Accelerator)- Work Life (Open Time): 20 minutes (for 10g mixed)- Handling Strength: Approximately 2 hours- Full Cure Time: 24 hours at 72°F (22°C)- Shore D Hardness: 85, 75-80- Shear Strength: 4,500 psi (on etched aluminum)- Viscosity (approx. @ 73°F/23°C): Base: 190,000-270,000 cP; Accelerator: 60,000-130,000 cP

Surface Compatibility

- Metals- Ceramics- Wood- Glass- Many Composites- Many Plastics

Known backups / known substitutes

- Maven Epoxy EAF420- Araldite 2019- Araldite 2031-1- Other 3M Scotch-Weld DP420 series variants (e.g., DP420 Black, DP420 Off-White)

Comparison Note

- Toughened epoxies like DP420 NS offer enhanced toughness and impact resistance compared to standard epoxies, making them suitable for applications with vibration, impact, or dynamic loads.- They provide improved flexibility and ductility, allowing them to absorb energy and distribute stress more effectively, reducing bond failure in applications subject to movement or temperature swings.- Unlike conventional epoxies which can be too rigid and prone to cracking under cyclic loads or temperature extremes, toughened epoxies maintain high strength while offering greater resistance to fatigue and thermal shock.