3M 2158

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

3M 2158

Main features

  • High-Strength Structural Bonding
  • 120-Minute Working Window
  • 1:1 Meter-Mix Processing

Product Description

3M™ Scotch-Weld™ Epoxy Adhesive 2158 B/A is a two-part, high-strength epoxy adhesive that chemically cures at room temperature to form a durable gray bond. It provides excellent adhesion to a wide variety of substrates, including metals, many plastics, wood, and damp concrete. Featuring a convenient 1:1 mix ratio by weight or volume, it is also recognized as meeting UL 94 HB standards for flammability.

Key features

  • Convenient mix ratio: Features a 1:1 mix ratio by weight or volume for simplified dispensing and application.
  • Versatile adhesion: Bonds strongly to multiple substrates, including metals, plastics, wood, and damp concrete.
  • Extended work life: Offers a 120-minute open time at room temperature, allowing ample time for complex assemblies and positioning.

Applications / Suitable for

  • High-strength structural bonding
  • Assembling metals, plastics, and wood
  • Applications requiring bonding to damp concrete
Product Family

3M 2158

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
1:1
Solids
100 %
Work life @25°C
Work life is the amount of time we have to work with a material until it is no longer able to be easily worked and applied on a substrate. It is based on the change in viscosity and it can rely on the application requirements.
2 hours
Physical Properties
Viscosity (Part A)
200,000 - 800,000 mPa.s
Viscosity (Part B)
250,000 - 450,000 mPa.s
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
54 %
Peel Strength
3 lb/in width
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.
1.4E+15 Ohms⋅cm
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.
52 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Typical properties; these values are not intended for use in preparing specifications.

Property Value Unit Method / condition
Mix Ratio 1:1 - By weight or volume
Color White - Base
Color Dark Gray - Accelerator
Viscosity 250,000 - 450,000 cP Base at 23°C
Viscosity 200,000 - 800,000 cP Accelerator at 23°C
Work Life 120 minutes 100g mixed at 23°C
Technical properties

After-processing / final-state properties

Typical properties; these values are not intended for use in preparing specifications.

Property Value Unit Method / condition
Cured Color Gray - -
Durometer Hardness 85 Shore D ASTM D2240
T-Peel Adhesion 3 lb/in width ASTM D1876, FPL Etched Aluminum
Dielectric Constant 5.6 - 1 KHz (ASTM D150)
Volume Resistivity 1.4E+15 Ohm-cm ASTM D257

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