CONATHANE EN-21

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

CONATHANE EN-21

Main features

  • Low-viscosity
  • Room-temperature cure
  • Good electrical and thermal properties

Product Description

CONATHANE® EN-21 Polyurethane Encapsulant is a two-component, unfilled, low-viscosity polyurethane potting compound for electronic circuits, components, and power devices. The system supports hand-mix, meter-mix, and vacuum potting or casting processes and may cure at room temperature or with low-temperature heat. Documented applications include transformers, coils, reed and mercury switches, inductors, ignition systems, voltage regulators, ballasts, microcircuits, rectifiers, and printed circuit assemblies. Typical cured properties include Shore A 80 hardness, 155% elongation, 0.3 W/m·K thermal conductivity, moisture resistance, and thermal-shock performance.

Key features

  • Low-viscosity processing: Typical initial mixed viscosity is 2,000 cP at 25°C.
  • Room-temperature or heat cure: Recommended cure options are seven days at 25°C or four hours at 80°C.
  • Electrical and thermal properties: Typical data include 650 V/mil dielectric strength and 0.3 W/m·K thermal conductivity.

Applications / Suitable for

  • Transformers, coils, switches, and inductors
  • Voltage regulators, ballasts, and rectifiers
  • Microcircuits and printed circuit assemblies
Product Family

CONATHANE EN-21

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
Clear Amber / Clear Amber
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two (Urethane Prepolymer / Curative)
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.
1.14 / 0.96

Additional Information

Technical properties

As-supplied / before-processing properties

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

Property Value Unit Method / condition
Part A viscosity 6,000 cP At 25°C
Part B viscosity 800 cP At 25°C
Part A specific gravity 1.14 N/A At 25°C
Part B specific gravity 0.96 N/A At 25°C
Mix ratio 100:116 parts by weight Part A : Part B
Initial mixed viscosity 2,000 cP At 25°C
Pot life 40 min At 25°C
Cure options 7 days at 25°C; 4 h at 80°C N/A Recommended schedules
Technical properties

After-processing / final-state properties

Typical final-state values under the stated system and test conditions. These values are not sales specifications.

Property Value Unit Method / condition
Hardness 80 Shore A ASTM D2240 at 25°C
Tensile strength 2,000 psi ASTM D412 at 25°C
Ultimate elongation 155 % ASTM D412 at 25°C
Tear strength 120 pli ASTM D624 at 25°C
Dielectric strength 650 V/mil ASTM D149, 1/16 in specimen
Volume resistivity 7.2 × 10¹⁴ ohm·cm ASTM D257 at 25°C
Thermal conductivity 0.3 W/m·K ASTM C177 at 25°C
Coefficient of thermal expansion 210 ppm/°C ASTM D696 at 25°C

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