KE-521 A/B

Product Description

Shin-Etsu's KE-521 A/B is a dual component, room-temperature cure, self-leveling potting encapsulant that will cure to form a durable, flexible foam to protect electronic components. KE-521 A/B is a chemically foaming, dimethyl-based, silicone material that will triple in volume during the curing process.

Product Features

  • Triple-volume foam
  • Dual component
  • Room-temperature cure
  • Self-leveling

Typical Applications

  • Potting applications that require a decreased density

Typical Properties

Potting Encapsulant
Cure Type
One/Two Component
Density @ 23C (g/cm3)
Viscosity A (cps)
Mix Ratio by weight
Cure Conditions
24hr @ 23C
Working Time
8 Minutes
Shore A Hardness
Tensile Strength (MPa)
% Elongation
Volume Resistivity (TΩ·m)
Dielectric Strength (kV/mm)
Dielectric Constant
2.2 @ 50Hz
Dielectric Dissipation Factor
5x10-3 @ 50Hz
Thermal Conductivity (W/m·K)
Usable Temperature Range (C)
-40 to +180

Note: Values are not for specification purposes.

Warranty- The information and data contained herein are believed to be accurate and reliable; however it is the user's responsibility to determine suitability of use. Since Shin-Etsu Silicones, Inc. cannot know all of the uses to which its products may be put or the conditions of use, it makes no warranties concerning the fitness or suitability of its products for a particular use or purpose. You should thoroughly test any proposed use of our products and independently conclude satisfactory performance in your application. Likewise, if the manner in which our products are used requires governmental approval or clearance, you must obtain it. Shin-Etsu Silicones, Inc. warrants only that its products will meet its specifications. There is no warranty of merchantability of fitness of use, nor any other expressed or implied warranties. The user's exclusive remedy and Shin-Etsu Silicones, Inc.'s sole liability is limited to refund of the price or replacement of any product shown to be otherwise than as warranted. Shin-Etsu Silicones, Inc. will not be liable for incidental or consequential damages of any kind. Suggestions of uses should not be taken as inducements to infringe any patents.

Contact Us
Shin-Etsu Silicones of America, Inc.
1150 Damar Drive
Akron, Ohio 44305-1201

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