3M DP420NS
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- High-Strength Structural Bonding
- Toughened Epoxy Bonding
- Non-Sag Placement Control
Product Description
3M™ Scotch-Weld™ Epoxy Adhesive DP420NS Black is a black, toughened, non-sag, two-part epoxy structural adhesive designed for high-strength bonding applications. It provides excellent shear strength, excellent peel strength, high impact and fatigue resistance, and a 20-minute open/work time for positioning and adjustment. DP420NS Black bonds a variety of substrates including metals, ceramics, wood, glass, many composites and plastics, and can be used for joining, gluing, potting, panel bonding and structural bonding.
Key features
- High-strength structural epoxy: Provides excellent shear and peel strength for demanding bonding applications.
- Toughened performance: Supports impact and fatigue resistance in bonded assemblies.
- Non-sag formulation: Helps adhesive remain where applied on vertical or controlled-placement applications.
- 20-minute open time: Provides time for positioning and adjustment before the bonded joint must be closed and fixed.
- UL 94 HB recognition: Documented as recognized as meeting UL 94 HB.
Suitable for
- Small joint assembly and heavy-duty mounting assembly
- Metalworking and structural bonding
- Carbon fiber epoxy bonding, panel bonding and composite bonding
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Thermal Properties
Mechanical Properties
Additional Information
3M™ Scotch-Weld™ Epoxy Adhesive DP420NS Black
3M™ Scotch-Weld™ DP420NS Black is a black, toughened, non-sag, two-part epoxy structural adhesive for demanding bonding applications. It combines excellent shear and peel strength with impact and fatigue resistance, a 20-minute open time and a 2:1 mix ratio by volume. It is suitable for bonding metals, ceramics, wood, glass, many composites and plastics.
Toughened, non-sag two-part epoxy adhesive for structural bonding.
Key processing properties
DP420NS Black is supplied as a two-part epoxy adhesive with an amine accelerator and epoxy base. Its non-sag rheology supports controlled placement, while its open time allows positioning before the joint is closed and fixed.
| Property | Typical value | Condition/ Test method |
|---|---|---|
| Accelerator resin (part A) | Amine | - |
| Base resin (part B) | Epoxy | - |
| Mix ratio by weight, B:A | 2:0.99 | For bulk/manual proportioning |
| Accelerator viscosity | 89,000 mPa·s | 23°C; cone-and-plate viscometer, 4 sec⁻¹ shear rate |
| Base viscosity | 211,000 mPa·s | 23°C; cone-and-plate viscometer, 4 sec⁻¹ shear rate |
Technical values are representative or typical only and should not be used for specification purposes.
Mixing, dispensing and bonding
DP420NS Black is compatible with 3M™ EPX™ Duo-Pak cartridge dispensing and may also be used with two-part mixing, proportioning and dispensing equipment for intermittent or production-line use. Complete mixing of Part A and Part B is required to obtain optimum properties.
Recommended visual: surface preparation, 2:1 metering, mixing, non-sag adhesive placement, joint closure and cure.
Storage and handling
Store DP420NS Black under normal conditions of 16–27°C and 40–60% relative humidity in the original packaging, out of direct sunlight. For best performance, use this product within 24 months from the date of manufacture. Review the product label and applicable SDS before handling.
Selected overlap shear and peel performance
DP420NS Black is documented with high overlap shear strength on prepared metals and composites, plus peel and impact data. Values are substrate-, preparation-, bondline-, cure- and test-specific and should not be treated as universal joint-strength ratings.
| Dwell time | Substrate | Surface preparation | Typical value |
|---|---|---|---|
| 24 h | Aluminum | Etched | 29.4 MPa |
| 7 d | Aluminum | Sandblasted | 26.0 MPa |
| 7 d | Cold rolled steel | Acetone / abrade / acetone | 18.8 MPa |
| 7 d | FRP, epoxy | Acetone / abrade / acetone | 30.8 MPa |
| 7 d | Polycarbonate | IPA wipe | 3.9 MPa |
Overlap shear results used ASTM D1002 / ISO 4587. The documented standard specimen used 25 mm wide, 12.7 mm overlap samples with a 0.13–0.20 mm bondline unless otherwise stated.
Thermal and environmental performance indicators
The cured adhesive has documented hardness, thermal properties and environmental overlap-shear data. These values should be interpreted with their test method, substrate and exposure conditions.
| Exposure condition | Typical value | Reported retention basis |
|---|---|---|
| 200°C / 30 minutes | 31.2 MPa | 120% |
| 85°C + 85% RH, 500 hours | 31.2 MPa | 96% |
| Diesel fuel, 500 hours | 28.9 MPa | 111% |
| Gasoline, 500 hours | 25.0 MPa | 97% |
| Salt water, 5 wt% in water, 500 hours | 21.6 MPa | 83% |
Environmental results were measured on aluminum specimens with MEK / sandblast / MEK surface preparation at 23°C after seven days dwell. Application-specific testing is required for actual joint geometry, exposure and service conditions.
Structural bonding applications
DP420NS Black is intended for industrial and occupational structural bonding applications requiring high strength, impact resistance, fatigue resistance and non-sag placement.
Metalworking and heavy-duty mounting
Use for metalworking and mounting assemblies where prepared metal substrates require high-strength structural bonds.
Composite and carbon fiber bonding
Documented applications include carbon fiber epoxy bonding, with tested overlap shear data on epoxy and polyester fiber-reinforced plastic.
Small joint, panel and structural bonding
The non-sag formulation and 20-minute open time support controlled placement, positioning and assembly before cure.
Evaluate 3M™ Scotch-Weld™ DP420NS Black for your structural bonding process
Contact Krayden to review substrate preparation, dispensing format, open time, cure requirements, bondline design and application-specific strength or environmental testing for your structural bonding application.
