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THERM-A-GAP™ gap-filler sheets and pads offer excellent thermal properties and highest conformability at low clamping forces.

  • Ultra low deflection force
  • High thermal conductivity
  • High tack surface reduces contact resistance
  • "A" version offers high strength acrylic PSA for permanent attachment
  • UL recognized V-0 flammability
  • RoHS compliant

  • All products are available on aluminum foil (A) or on "clean break" glass (G) fiber carrier. As with all previous Chomerics gapfillers, the "A" versions have a high strength acrylic pressure sensitive adhesive (PSA) for permanent attachment to the cold surfaces.
    Unit of Measure

    Test Method Color

    N/A Visual


    N/A Orange


    N/A Aluminum foil - with PSA Woven glass - no PSA

    Test Method Thicknesses

    N/A ASTM D374
    Standard Thickness1 N/A 0.25–5.0 mm0.010–0.200 in

    Test Method Specific Gravity

    N/A ASTM D792

    Specific Gravity

    N/A 2.0

    Test Method Hardness

    N/A ASTM D2240

    Hardness, Shore 00

    N/A 4

    Test Method Extractable Silicone

    N/A Chomerics

    Test Method Percent Deflection at Various Pressures

    N/A ASTM C165 MOD (0.125 in “G” Type, 0.50 in dia. probe, 0.025 in/min rate)

    Percent Deflection at Various Pressures (0.125 in) at 34 kPa (5 psi) Deflected

    N/A 26 %

    Percent Deflection at Various Pressures (0.125 in) at 69 kPa (10 psi) Deflected

    N/A 36 %

    Percent Deflection at Various Pressures (0.125 in) at 172 kPa (25 psi) Deflected

    N/A 59 %

    Percent Deflection at Various Pressures (0.125 in) at 345 kPa (50 psi) Deflected

    N/A 73 %

    Operating Temperature Range

    N/A –55 to 200 ºC–67 to 392 ºF

    Test Method Thermal Impedance

    N/A ASTM D5470

    Thermal Impedance at 10 psi, at 1mm Thickness, G Version

    N/A 9.7 ºC-cm²/W1.5 ºC-in²/W

    Test Method Thermal Conductivity

    N/A ASTM D5470

    Thermal Conductivity

    N/A 1 W/m·K

    Test Method Heat Capacity

    N/A ASTM E1269

    Heat Capacity

    N/A 1 J/g-K

    Test Method Coefficient of Thermal Expansion

    N/A ASTM E831

    Test Method Dielectric Strength

    N/A ASTM D149

    Dielectric Strength

    N/A 8 KVac/mm200 Vac/mil

    Test Method Volume Resistivity

    N/A ASTM D257

    Volume Resistivity

    N/A 1014 O/cm

    Test Method Dielectric Constant

    N/A ASTM D150

    Dielectric Constant at 1000 kHz

    N/A 5.3

    Test Method Dissipation Factor

    N/A Chomerics Test

    Dissipation Factor at 1000 kHz

    N/A 0.013

    Test Method Flammability Rating

    N/A UL 94

    Flammability Rating

    N/A Not tested

    Test Method RoHS Compliant

    N/A Chomeric Certification

    RoHS Compliant

    N/A Yes

    Test Method Outgassing

    N/A ASTM E595

    Outgassing TML

    N/A 0.44 %

    Outgassing CVCM

    N/A 0.13 %

    Test Method Shelf Life

    N/A Chomerics

    Shelf Life, Months from Date of Shipment G

    N/A 24

    Shelf Life, Months from Date of Shipment A

    N/A 18
    • 1 Thickness tolerance, mm(in.) ±10 % nominal thickness at 2.5 mm (100 mil) or less; ± 0.25 mm (10 mil) at nominal thickness greater than 2.5 mm (100 mil). Custom thicknesses may be available upon request.