e-Therm 250

Thermaly Conductive Insulating Rubbers

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e-Therm 250 is a silicone rubber filled with proprietary, thermally conductive ceramic filler. This material has unique thermal conductivity and is useful were very high thermal conductivity is required while electrical insulation is maintained.
Very high thermal conductivity.  e-Therm250
High dielectric strength.
High thermal resistance and stability.
Low compression set.
Ability to conform to uneven surfaces improves thermal conductivity with time.
Thermal performance improves with age.
Effective over a wide range of temperature.
Can be molded to any shape.
Greaseless, non-flowing, non-cracking, one component material.
Flame retardant.
Chemical resistance for process cleaning agents.
Available also in sheets or custom die-cut parts.
Available also with pressure sensitive adhesive.
Physical Properties Typical Values Test Method
Elastomer binder Silicone  
Color Grey  
Operational Temperature, °C (-60) to (+180)  
Hardness, Shore A 75±5 ASTM D-2240
Tensile Strength, psi (Mpa) 210 (1.43) ASTM D-412
Elongation, % 10 ASTM D-412
Modulus, psi (MPa) 2150 (14.6) ASTM D-624
Volume Change in Water 24hr@25°C +0.08% ASTM D-471
Specific Gravity, gr/cm3 2.3 ASTM D-792
Low Temperature Brittleness, °C -55  
Heat Aging after 70hr @ 200°C  200°C ASTM D-573
Hardness Change, points 2  
Modulus Change, % +26  
Elongation Change, % -6  
Thermal Conductivity, W/m-K 20.0 ASTM D-5470
Volume Resistivity (ohm-cm) >1014 ASTM D-5470
Dielectric Constant 6.6  ASTM D-150

NOTICE: The information contained herein is true to the best of our knowledge. However, since varied condition of potential use are beyond our control, users should make their own tests and evaluation to determine the suitability of our products in any specific situation and use. These products are sold without warranty, either expressed or implied, of fitness for a particular purpose or otherwise, except to the extent otherwise stated on Alvas quotation, order confirmation or invoice. We disclaim any liability incurred in connection with the use of information contained herein, or otherwise. All risks of such are assumed by the user.