3M EC-1838

Harmonization Code : 3214.10.00 | Putty and other mastics | Resin cements, caulking compounds and other mastics

3M EC-1838

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.

Product Family

3M EC-1838

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two (Accelerator | Base)
Other Properties
Storage Temperature
16 - 27 °C
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
55 °C
Electrical Properties
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
1.5 x 10¹⁵ Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
Mix ratio by volume4:5B:ATwo-part system
Mix ratio by weight1:1B:ATwo-part system
Base colorWhite-Before mixing
Accelerator colorGreen-Before mixing
Base viscosity70000 to 600000cPAt 27 deg C
Accelerator viscosity300000 to 1000000cPAt 27 deg C
Work life60min100 g mixed at 23 deg C
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
ColorGreen-Cured
Hardness82Shore DASTM D2240 at 23 deg C
Elongation at break2 to 3%At 23 deg C
Tensile strength at break4290psiAt 23 deg C
Glass transition temperature55deg CDSC midpoint
Volume resistivity1.5 x 10^15ohm-cmASTM D257 at 23 deg C

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