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3M™ Scotch-Weld™ Epoxy Adhesive DP405 Black

Brand: 3M™ Scotch-Weld™
Package Sizes: 50 ml, 200 ml, 400 ml cartridges
Shelf Life: 18 months

Product Description

3M™ Scotch-Weld™ Epoxy Adhesive DP405 Black is a two-part, 2:1 mix ratio, toughened epoxy structural adhesive. It features a 5-minute work life and accelerated cure with excellent shear and peel strengths, good impact resistance, and durability. It bonds effectively to metal and composite surfaces and has low odor compared to traditional fast-cure epoxies and acrylic adhesives.

Key Features

  • Fast curing – 5-minute work life
  • Excellent shear and peel strengths
  • Low odor
  • Easy mixing and application

Recommended Applications

  • Metal bonding, including aluminum, steel, and brass
  • Composite bonding in aerospace, automotive, and industrial applications
  • Structural bonding requiring high shear and peel strength
  • Electronics and electrical assembly where impact resistance is needed
  • General industrial manufacturing for durable, high-strength adhesive joints

Uncured Properties

Property Value
Color Black (may vary from nearly white to yellow/amber)
Accelerator Color Clear
Mix Ratio (B:A) by Weight 2.1:1
Mix Ratio (B:A) by Volume 2:1
Base Resin Epoxy
Base Viscosity (at 23°C) 11,000 cP
Accelerator Viscosity (at 23°C) 6,500 cP
Base Net Weight Approx. 10 lb/gal
Accelerator Net Weight Approx. 9.2 lb/gal

Curing & Strength Buildup

Time Strength (Aluminum, ASTM D1002, 23°C)
15 min 43 psi
30 min 110 psi
1 hour 240 psi
2 hours 630 psi
3 hours 1,630 psi
6 hours 4,410 psi
24 hours 4,790 psi
Property Value
Open Time 4 min
Work Life (23°C) 4 min
Set Time 8 – 10 min
Time to Full Cure (23°C) 15 hours
Cured Hardness (Shore D, ASTM D2240) 77

Performance Characteristics

Substrate Shear Strength (psi) (ASTM D1002, 23°C)
Aluminum 2,580 psi
Cold Rolled Steel 2,260 psi
Galvanized Steel 2,050 psi
Copper 2,300 psi
Brass 2,830 psi
Test Temperature Strength
Bell Peel (Aluminum, ASTM D3167) -55°C 18 lb/in width
23°C 40 lb/in width
82°C 8 lb/in width

Electrical & Thermal Properties

Property Value
Dielectric Constant (ASTM D150, 1 kHz) 4.1
Dissipation Factor (ASTM D150, 1 kHz) 0.016
Volume Resistivity (ASTM D257) 4.4 × 10¹⁵ Ω-cm
Coefficient of Thermal Expansion (20–70°C) 180 × 10⁻⁶
Coefficient of Thermal Expansion (20–100°C) 105 × 10⁻⁶

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