3M 7100148736 Scotch-Weld Epoxy Adhesive DP420, Off-White, 50 mL Duo-Pak
3M 7100148736 Scotch-Weld Epoxy Adhesive DP420, Off-White, 50 mL Duo-Pak
3M Scotch-Weld DP420 is a toughened, two-part structural epoxy adhesive delivering 4,500 psi shear strength with high impact and fatigue resistance. With a 20-minute open time and 24-hour full cure at 72°F, it bonds metals, ceramics, wood, glass, composites, and many plastics — and can replace mechanical fasteners, screws, rivets, and spot welds. Sold as a 50 mL Duo-Pak (2:1 mix ratio). Pricing shown is per single item; sold as 12/case.
Product Specifications
| Specification | Value |
|---|---|
| Part Number | 7100148736 |
| Manufacturer | 3M |
| Brand | Scotch-Weld |
| Adhesive Type | Toughened two-part epoxy |
| Color | Off-White |
| Volume | 50 mL Duo-Pak |
| Mix Ratio | 2:1 (base:accelerator) |
| Open Time | 20 minutes @ 72°F (22°C) |
| Handling Strength | ~2 hours |
| Full Cure | 24 hours @ 72°F (22°C) |
| Shear Strength | 4,500 psi |
| Hardness | 75–80 Shore D |
| Specific Gravity | 1.14 |
| High Temp Resistance | Withstands paint bake up to 400°F for 60 min |
| Certification | UL 94 HB |
| Storage Temperature | 72°F (22°C) |
Key Features & Benefits
- Toughened Formula — High impact and fatigue resistance for demanding structural bonding applications
- High Shear Strength — 4,500 psi shear strength for long-lasting, durable bonds
- 20-Minute Open Time — Ample working time for positioning and adjustment before cure begins
- Replaces Mechanical Fasteners — Can substitute for screws, rivets, and spot welds in many assemblies
- Broad Substrate Compatibility — Bonds metals, ceramics, wood, glass, composites, and many plastics
- Paint Bake Resistant — Withstands temperatures up to 400°F for 60 minutes
- UL 94 HB Certified — Meets flammability requirements for industrial and electronics applications
- Low Odor — Suitable for use in enclosed or ventilation-limited environments
Typical Applications
- Small joint and heavy-duty mounting assembly
- Metalworking and carbon fiber epoxy bonding
- Structural bonding in sporting goods and transportation
- Panel bonding and potting in general industrial applications
- Replacing rivets, screws, and spot welds in assemblies
- Electronics and military/defense component bonding
Frequently Asked Questions
What is the mix ratio for 3M DP420?
The mix ratio is 2:1 (base to accelerator) by volume. Use a 3M EPX Duo-Pak applicator gun for accurate metering and mixing. Do not attempt to mix manually — incorrect ratios will result in incomplete cure.
How long does 3M DP420 take to cure?
It reaches handling strength in approximately 2 hours and achieves full cure in 24 hours at 72°F (22°C). Higher temperatures will accelerate cure; lower temperatures will slow it.
Can DP420 replace mechanical fasteners?
Yes — it is specifically designed to replace screws, rivets, and spot welds in many structural applications, providing a continuous bond line that distributes stress more evenly than point fasteners.
Is 3M DP420 suitable for high-temperature applications?
It withstands paint bake operations up to 400°F (204°C) for 60 minutes, making it suitable for assemblies that go through post-bond finishing processes.
What applicator is needed for the 50 mL Duo-Pak?
Use the 3M EPX Plus II Manual Applicator (50 mL, 2:1 ratio) for dispensing. The applicator ensures accurate mix ratio and consistent bead output. Contact MTE Solutions for applicator availability.
