3M EC-1838
Harmonization Code : 3214.10.00 | Putty and other mastics | Resin cements, caulking compounds and other mastics
Main features
- Controlled Flow Structural Placement
- One Hour Assembly Work Life
- Durable Environmental Bonding
Product Description
3M Scotch-Weld Epoxy Adhesive EC-1838 B/A is a green, controlled-flow structural epoxy for prepared metals, wood, and selected plastics. Mix Part B and Part A at 4:5 by volume or 1:1 by weight; the paste provides a 60 minute work life at 23 deg C and limits migration after placement. Handling strength develops in 6 to 10 hours at room temperature or 15 to 20 minutes at 65 deg C. The cured adhesive reaches Shore D 82 hardness, 2% to 3% elongation, and a 55 deg C glass transition temperature.
Key features
- Controlled Flow Placement: The paste formulation limits migration after the adhesive is applied.
- One Hour Work Life: A 60 minute processing window supports coating, alignment, and fixturing.
- Durable Structural Epoxy: High shear strength and environmental resistance support prepared industrial joints.
Applications
Structural bonding of prepared metals, wood, selected plastics, and assemblies requiring controlled adhesive flow.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Component SystemComponent System
Two (Accelerator | Base)Other Properties
Storage TemperatureStorage Temperature
16 - 27 °CThermal Properties
Glass Transition Temperature (Tg)Glass Transition Temperature (Tg)
55 °CElectrical Properties
Volume ResistivityVolume Resistivity
1.5 x 10¹⁵ Ohms⋅cmAdditional Information
Technical properties
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Mix ratio by volume | 4:5 | B:A | Two-part system |
| Mix ratio by weight | 1:1 | B:A | Two-part system |
| Base color | White | - | Before mixing |
| Accelerator color | Green | - | Before mixing |
| Base viscosity | 70000 to 600000 | cP | At 27 deg C |
| Accelerator viscosity | 300000 to 1000000 | cP | At 27 deg C |
| Work life | 60 | min | 100 g mixed at 23 deg C |
Technical properties
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Green | - | Cured |
| Hardness | 82 | Shore D | ASTM D2240 at 23 deg C |
| Elongation at break | 2 to 3 | % | At 23 deg C |
| Tensile strength at break | 4290 | psi | At 23 deg C |
| Glass transition temperature | 55 | deg C | DSC midpoint |
| Volume resistivity | 1.5 x 10^15 | ohm-cm | ASTM D257 at 23 deg C |
