3M ScotchWeld DP420 Black 20-Minute Toughened Epoxy Adhesive

Product Name

3M ScotchWeld DP420 Black 20-Minute Toughened Epoxy Adhesive

Brief Description

3M Scotch-Weld DP420 Black is a toughened, two-part epoxy structural adhesive engineered to deliver high strength, exceptional impact, and fatigue resistance for demanding bonding challenges. It is designed to replace mechanical fasteners, screws, rivets, and spot welds in numerous applications.

Popular Applications & Uses

- Small joint assembly- Heavy-duty mounting assembly- Metalworking and carbon fiber epoxy bonding- General joining, gluing, attaching, assembling, combining, and repairing- Panel bonding and structural bonding- Potting applications- As an alternative to riveting, welding, bolt setting, and frame building- Bonding electrical connectors

Industries that Commonly Use It

- Aerospace/Defense- Automotive Service/Repair- Construction/ Building Services- Energy (e.g., solar and wind energy)- General Manufacturing (including consumer goods and sporting goods)- LED/Electronics- Metal Fabrication- Plastic Fabrication (including composites)- Sign & Display- Transportation/ Specialty Vehicle

Special and Unique Features

- Toughened for high impact and fatigue resistance, ideal for tough environmental challenges- Provides high peel and shear strength for durable bonds- Maintains bond strength across a wide range of temperatures (high and low)- Can withstand paint bake operations up to 400°F (204.4°C) for 60 minutes- Cures at room temperature, offering convenience, with faster strength development achievable with heat cure- Features a 20-minute work life, allowing ample time for positioning and adjustment of parts- Exhibits low odor during application- UL 94 HB Certified, indicating a level of flame retardancy- Effectively replaces mechanical fasteners, screws, rivets, and spot welds in many applications

Key Properties

- Adhesive Type: Two-part epoxy structural adhesive- Color: Black (also available in off-white)- Mix Ratio (Volume Base:Accelerator): 2:1- Work Life (Open Time): 20 minutes at 72°F (22°C)- Handling Strength: Approximately 2 hours- Full Cure Strength: 24 hours at 72°F (22°C)- Hardness: 75-80 Shore D- Shear Strength: 4500 psi- Peel Strength: 20 to 60 piw (depending on temperature)- Viscosity (approx.): Base: 20,000-50,000 cP; Accelerator: 8,000-14,000 cP- Specific Gravity: Part A: 1.12; Part B: 1.14

Surface Compatibility

- Metals- Ceramics- Wood- Glass- Many Composites (including carbon fiber reinforced polymers - CFRP)- Many Plastics

Known backups / known substitutes

- Araldite 2019- Other 3M Scotch-Weld Epoxies such as DP100, DP125, DP190, DP420NS (Non-Sag), and DP420 LH (Low Halogen) may serve as alternatives depending on specific application requirements

Comparison Note

3M Scotch-Weld DP420 stands out as a toughened epoxy, specifically formulated for applications requiring high impact and fatigue resistance, making it ideal for environments with vibration and significant stress. Its 20-minute work life offers a good balance between assembly time and cure speed, providing more flexibility than faster-setting epoxies like 3M Scotch-Weld DP100 (5-minute work life). The adhesive's high shear and peel strength make it a robust and durable alternative to traditional mechanical fastening methods.