3M 2158 | Krayden

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

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Mix Ratio

1:1

Solids

100 %

Work life @25°C

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

54 %

Peel Strength

3 lb/in width

Electrical Properties

Volume Resistivity

1.4E+15 Ohms⋅cm

Thermal Properties

Glass Transition Temperature (Tg)

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