3M 3738
Harmonization Code : 3214.10.00 | Putty and other mastics | Resin cements, caulking compounds and other mastics
Main features
- 2,875 cP Melt Viscosity at 191 deg C
- 50-Second Open Time
- 375 psi Douglas Fir Shear
Product Description
3M Hot Melt Adhesive 3738 is a tan, 100% solids thermoplastic hot-melt adhesive for bonding wood, corrugated materials, selected plastics, and foundry sand cores. The recommended application range is 177 to 196 deg C, with a typical viscosity of 2,875 cP at 191 deg C by Brookfield Thermocel testing. Typical open time is 50 seconds for a 3.2 mm bead on a nonmetallic surface at 24 deg C. The adhesive sets as it cools, with typical Douglas fir-to-Douglas fir overlap shear of 375 psi. Its typical temperature-resistance result is 54 deg C under a 14 kPa dead load.
Key features
- 2,875 cP application viscosity: Typical viscosity at 191 deg C is measured with Brookfield Thermocel spindle 27 at 10 rpm.
- 50-second open time: This typical maximum application-to-joining interval applies to a 3.2 mm bead on a nonmetallic surface at 24 deg C.
- 375 psi wood overlap shear: This typical bond-strength result applies specifically to Douglas fir bonded to Douglas fir.
Applications
Foundry sand cores; cabinetry and woodworking; corrugated packaging; furniture and upholstery; point-of-purchase displays; sound damping; general industrial assembly.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Thermal Properties
Chemical Properties
Other Properties
Additional Information
As-supplied / before-processing properties
Values are typical and not specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Tan | - | Solid adhesive |
| Density | 0.95 | g/cm^3 | Solid adhesive |
| Recommended application temperature | 177 to 196 | deg C | Hot-melt application |
| Viscosity | 2,875 | cP | 191 deg C; Brookfield Thermocel #27 at 10 rpm |
| Open time | 50 | s | 3.2 mm bead on nonmetallic substrate at 24 deg C |
| Delivery time | 35 | s | 25 x 76 mm PG cartridge |
After-processing / final-state properties
Values are typical and not specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Heat resistance | 54 | deg C | Highest temperature supporting a 14 kPa dead load |
| Ball and ring melt point | 86 | deg C | ASTM E28-67 |
| Overlap shear strength | 375 | psi | Douglas fir bonded to Douglas fir |
| Peel strength | 13 | piw | Flexible canvas bonded to Douglas fir |
