ARALDITE CW 177

Harmonization Code : 3909509090 | Polyurethanes potting

ARALDITE CW 177

Main features

  • Mineral-Filled Electrical Casting Epoxy
  • 22,000 to 27,000 mPa s Casting Viscosity
  • Transformer and Capacitor Encapsulation

Product Description

ARALDITE® CW 177 Epoxy Casting Resin is a modified, mineral-filled epoxy casting resin for use in compatible two-component electrical encapsulation systems. The beige, gray, or black liquid resin is formulated for flow during casting or impregnation and is documented for transformer, filter, and capacitor applications. Its filled composition provides thermal conductivity, but final cure conditions and cured properties depend on the selected hardener and system formulation. The resin has a typical viscosity of 22,000 to 27,000 mPa·s at 25°C and a specific gravity of 1.7.

Key features

  • Filled epoxy casting resin: The modified mineral-filled resin is used in compatible electrical encapsulation systems.
  • Casting and impregnation flow: Typical viscosity is 22,000 to 27,000 mPa·s at 25°C.
  • Electrical component applications: Documented applications include transformers, filters, and capacitors.

Applications / Suitable for

  • Transformer casting and impregnation
  • Electrical filters
  • Capacitor encapsulation
Product Family

ARALDITE CW 177

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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 (CW 177 CI / HY 177 CI)
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
100 : 20
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.7 / 0.98
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.
40 °C
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
0.4 W/m.K
Chemical Properties
Water Absorption
0.28 %

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied values unless otherwise stated. These values are not sales specifications.

Property Value Unit Method / condition
Product form Modified mineral-filled epoxy resin N/A As supplied
Appearance Beige, gray, or black liquid N/A As supplied
Viscosity 22,000 to 27,000 mPa·s ISO 2555 at 25°C
Specific gravity 1.7 N/A At 25°C
Flash point 135 °C As supplied
Handling Homogenize before use N/A Filler may settle during storage

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