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

3M Scotch-Weld DP420 NS is a black, two-part toughened structural epoxy adhesive engineered for high-strength bonding applications requiring durability, impact resistance, and controlled non-sag application. Designed to replace mechanical fasteners such as screws, rivets, and spot welds, 3M DP420 NS delivers strong structural bonds across a wide range of substrates.

This 3M DP420 NS epoxy features a thick, non-sag, no-drip gel consistency that remains in place on vertical and overhead surfaces, allowing for more controlled adhesive placement during assembly and fabrication. The toughened epoxy formulation provides excellent resistance to vibration, fatigue, impact, and thermal cycling, making it well-suited for demanding industrial bonding environments.

With a 20-minute work life, 3M DP420 non-sag provides sufficient time for positioning and adjustment while still achieving handling strength in approximately two hours and full cure within 24 hours at 72°F (22°C). The adhesive maintains bond strength across high and low temperatures and can withstand paint bake operations up to 400°F (204°C) for limited exposure periods.

APPLICATIONS

3M DP420 NS is commonly used for:

• Structural bonding and panel bonding

• Replacing screws, rivets, and spot welds

• Heavy-duty mounting assemblies

• Metalworking and composite assembly

• Carbon fiber epoxy bonding

• Potting and general industrial bonding

• Crash-zone and transportation component repair

• Wind turbine blade bonding

• Bonding electronic, optical, and medical components

FEATURES

• Toughened structural epoxy formulation for high impact and fatigue resistance

• Non-sag, no-drip gel consistency for vertical and overhead applications

• High peel and shear strength performance

• Maintains bond strength at elevated and low temperatures

• Resistant to vibration and cyclic loading

• 20-minute work life for positioning flexibility

• Suitable for replacing mechanical fastening methods

• UL 94 HB flammability certified

• Compatible with metals, ceramics, wood, glass, composites, and many plastics

PERFORMANCE

3M Scotch-Weld DP420NS is designed for demanding structural bonding applications that require durability and long-term bond performance.

Working & Cure Properties

• Work Life/Open Time: 20 minutes (10g mixed)

• Handling Strength: Approximately 2 hours

• Full Cure Time: 24 hours at 72°F (22°C)

• Mix Ratio by Volume: 2:1 (Base:Accelerator)

Mechanical Properties

• Shear Strength: 4,500 psi (etched aluminum)

• Shore D Hardness: 85 / 75–80

Viscosity

• Base: 190,000–270,000 cP @ 73°F (23°C)

• Accelerator: 60,000–130,000 cP @ 73°F (23°C)

Temperature Resistance

• Maintains bond strength at both high and low temperatures

• Withstands paint bake operations up to 400°F (204°C) for up to 60 minutes

Surface Compatibility

• Metals

• Ceramics

• Wood

• Glass

• Many composites

• Many plastics

This 3M DP420 NS epoxy is engineered to provide durable structural bonding performance in applications exposed to impact, vibration, temperature fluctuations, and dynamic loading conditions.