3M Scotch-Weld DP420 High-Strength Epoxy for Metal Structural
Bonding
Basic Properties
3M DP420 is a two-part epoxy adhesive available in Black, NS Black,
Off-White, and LH variants. It features a 2:1 mix ratio, 15-30 min
worklife at 23°C, and is engineered for ultra-high-strength bonding
of metals and composites, with UL 94 HB flammability rating
(Off-White).
Product Description
DP420 delivers 4500 psi shear strength on etched aluminum and
retains 570 psi at 121°C. The LH variant complies with IEC
61249-2-21 (<1500 ppm halogens) for electronics. Resists water,
oils, and solvents with >85% strength retention after 30-day
immersion.
Characteristics
| Property | DP420 Black | DP420 Off-White | Test Condition |
|---|
| Viscosity (cP) | 20k-50k (B)
8k-14k (A) | 20k-50k (B)
8k-14k (A) | Brookfield @23°C |
| Al Shear @23°C (psi) | 4,500 | 4,500 | Etched Al, ASTM D1002 |
| T-Peel Strength (PIW) | 50 | 50 | Aluminum, ASTM D1876 |
| Volume Resistivity | 1.6×10¹⁵ ohm·cm | 1.3×10¹⁴ ohm·cm | ASTM D257 |
| Thermal Conductivity | 0.104 BTU·ft/ft²·hr·°F | 0.104 BTU·ft/ft²·hr·°F | @45°C |
| Full Cure Time | 24 hr @60°C + 7d @23°C | 24 hr @60°C + 7d @23°C | Optimal strength |
Application Scenarios
Aerospace Structures: Bonds aluminum wing skins to frames. Complies with Boeing BMS
5-133 thermal cycling, applied in Airbus A320 flaps.
Heavy Truck Axles: Mounts steel axles to suspension brackets. Withstands 180°C oil
immersion (3000 psi), meets Daimler DBL 9435.
Railway Bogies: Bonds stainless steel bogie components. Passes EN 45545 fire
safety (smoke density <50), implemented in CRRC Fuxing trains.
Semiconductor Sealing: Seals aluminum chambers in wafer handlers. Passes SEMI F47 voltage
sag test, used in ASML lithography tools.
FAQ:
1. Who are we?
We are Shenzhen Huazhisheng New Material Technology Co., Ltd., a
professional industrial adhesives and sealants supplier based in
China since 2018. we serve global markets: Mainland China (60%),
Southeast Asia (20%), North America (10%), and Europe (10%).
2. What products do you offer?
we supply high-performance adhesives and sealants from global
leaders including:
Cemedine, Dow Corning, Shin-Etsu, Araldite, and Momentive,etc.
3. How do you guarantee product quality?
Quality assurance through:
Mandatory pre-production samples approval
Final inspection by QC team before shipment
International certifications: SGS, UL, FDA, RoHS, REACH
4. Why choose us over other suppliers?
Reliable Supply:Authentic products from top manufacturers
Expert Support:Technical guidance for product selection
Global Compliance:Certifications meeting target market standards
Efficient Service:Customized solutions & professional support
5. What services do you provide?
Delivery:EXW/FOB/CIF
Payment:USD/EUR/CNY/HKD via T/T, L/C
Support:Technical consultation & logistics coordination
