3M EC-3501

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

3M EC-3501

Main features

  • Rapid Structural Repair Bonding
  • Controlled Composite Defect Filling
  • High Room Temperature Shear

Product Description

3M Scotch-Weld Epoxy Adhesive EC-3501 B/A Gray is a gray, rapid-curing two-part epoxy for structural bonding and surface repair on prepared metals, composites, and selected plastics. Equal-volume mixing, a 6 to 10 minute work life at 24 deg C, and thixotropic flow support controlled placement in short-cycle assembly or repair. It can fill pinholes and localized surface porosity in cured fiber composites. After cure, the adhesive reaches Shore D 75 to 80 hardness and delivers 3200 psi aluminum overlap shear at 24 deg C with FPL-etched adherends.

Key features

  • Rapid Room Temperature Cure: A 6 to 10 minute work life supports short-cycle bonding and repair.
  • Composite Surface Repair: The epoxy fills localized porosity and pinholes in cured fiber composites.
  • Controlled Thixotropic Flow: High viscosity limits migration after the mixed adhesive is placed.

Applications

Structural bonding of prepared metals, composites, and selected plastics; localized porosity and pinhole repair in cured fiber composites.

Product Family

3M EC-3501

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Viscosity (Part A)
20-35 mPa.s
Viscosity (Part B)
40-55 mPa.s
General Properties
Color
The color
Gray
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
1:1
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
27.56 kV/mm
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.
1.2 x 10 ^13 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
Part B colorWhite-Base before mixing
Part A colorBlack-Accelerator before mixing
Mix ratio by volume1:1B:ATwo-part system
Mix ratio by weight1.05:1B:ATwo-part system
Base press-flow time15 to 40secAt 24 deg C
Accelerator press-flow time35 to 60secAt 24 deg C
Work life6 to 10min20 g mixed at 24 deg C
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
ColorGray-Cured
Hardness75 to 80Shore DCured
Overlap shear strength1500psiFPL-etched aluminum; tested at -55 deg C
Overlap shear strength3200psiFPL-etched aluminum; tested at 24 deg C
Overlap shear strength500psiFPL-etched aluminum; tested at 82 deg C
T-peel strength4piwAluminum; tested at 24 deg C
Dielectric strength700V/milCured adhesive

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