3M DP640
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- 40-Minute Working Window
- Thixotropic Non-Sag Placement
- 2,160 lb/in^2 Aluminum Overlap Shear
Product Description
3M™ Scotch-Weld™ Urethane Adhesive DP640 Brown is a two-part, non-sag polyurethane adhesive that forms tough, flexible bonds across a range of substrates. It is particularly suited to wood and many properly abraded and cleaned plastics, with documented adhesion to painted metals, ceramics, and glass. The 1:1 mix ratio and thixotropic consistency support controlled application, while a 40-minute work life and 60-minute open time provide an extended assembly window. At 23 °C, the adhesive reaches handling strength in approximately 6–8 hours and develops at least 80% of ultimate strength after 7 days. For maximum bond durability in moist conditions, glass surfaces require priming.
Key features
- Tough, flexible bonding: Produces flexible cured bonds with 100% elongation and 75 Shore A hardness.
- Extended assembly window: Provides a 40-minute work life and up to 60 minutes of open time.
- Non-sag 1:1 formulation: Thixotropic consistency supports controlled dispensing on vertical and overhead surfaces.
Applications / Suitable for
- Bonding wood
- Bonding properly abraded and cleaned plastics
- Bonding painted metals
- Bonding ceramics and glass
- Applications requiring a non-sag adhesive
Technical Specifications
General Properties
Physical Properties
Mechanical Properties
Thermal Properties
Electrical Properties
Additional Information
As-supplied / before-processing properties
Typical values for the individual components and mixed adhesive. These values are representative and are not intended for specification purposes.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Mixed color | Brown | — | Typical mixed adhesive |
| Mix ratio by volume | 1:1 | B:A | As supplied in a dual-component cartridge |
| Base density | 10.0–10.5 | lb/gal | Base component |
| Accelerator density | 11.1–11.5 | lb/gal | Accelerator component |
| Base viscosity | 10,000–40,000 | cP | 27 °C; Brookfield RVF, spindle #6, 10 rpm |
| Accelerator viscosity | 15,000–55,000 | cP | 27 °C; Brookfield RVF, spindle #6, 10 rpm |
| Work life | 40 | min | 10 g mixed adhesive at 23 °C |
| Open time | 60 | min | Maximum time after application before the bond is closed and fixed |
After-processing / final-state properties
Typical cured and bonded performance values under the stated test conditions. Results may vary with substrate, preparation, bondline, and curing conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Cured color | Brown | — | Typical cured adhesive |
| Shore A hardness | 75 | Shore A | ASTM D2240 at 23 °C |
| Elongation | 100 | % | ASTM D882 |
| Overlap shear strength — aluminum | 2,160 | lb/in² | ASTM D1002 / ISO 4587; 23 °C; 7-day dwell; MEK/abrade/MEK preparation |
| Overlap shear strength — cold-rolled steel | 1,960 | lb/in² | ASTM D1002 / ISO 4587; 23 °C; 7-day dwell; MEK/abrade/MEK preparation |
| Overlap shear strength — ABS | 1,729 | lb/in² | ASTM D1002 / ISO 4587; 23 °C; 7-day dwell; IPA wipe/abrade/IPA wipe |
| Bell peel | 64 | lb/in width | ASTM D3167; aluminum substrate at 23 °C |
| Volume resistivity | 2.6 × 10¹⁴ | Ω-cm | ASTM D257 at 23 °C |
