THERM-A-GAP™ gap-filler sheets and pads offer excellent thermal properties and highest conformability at low clamping forces.
Features/BenefitsUltra 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.
Features/Benefits
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 |
Color |
N/A Yellow |
Carrier |
N/A Aluminum foil - with PSA Woven glass - no PSA |
Test Method Thicknesses |
N/A ASTM D374 |
Standard Thickness1 | N/A 0.5–5.0 mm0.020–0.200 in |
Test Method Specific Gravity |
N/A ASTM D792 |
Specific Gravity |
N/A 2.9 |
Test Method Hardness |
N/A ASTM D2240 |
Hardness, Shore 00 |
N/A 45 |
Test Method Extractable Silicone |
N/A Chomerics |
Extractable Silicone |
N/A 6 % |
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 7 % |
Percent Deflection at Various Pressures (0.125 in) at 69 kPa (10 psi) Deflected |
N/A 10 % |
Percent Deflection at Various Pressures (0.125 in) at 172 kPa (25 psi) Deflected |
N/A 20 % |
Percent Deflection at Various Pressures (0.125 in) at 345 kPa (50 psi) Deflected |
N/A 30 % |
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 4.5 ºC-cm²/W0.7 ºC-in²/W |
Test Method Thermal Conductivity |
N/A ASTM D5470 |
Thermal Conductivity |
N/A 3 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 |
Coefficient of Thermal Expansion |
N/A 150 ppm/K |
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 8.0 |
Test Method Dissipation Factor |
N/A Chomerics Test |
Dissipation Factor at 1000 kHz |
N/A 0.010 |
Test Method Flammability Rating |
N/A UL 94 |
Flammability Rating |
N/A V-0 |
Test Method RoHS Compliant |
N/A Chomeric Certification |
RoHS Compliant |
N/A Yes |
Test Method Outgassing |
N/A ASTM E595 |
Outgassing TML |
N/A 0.18 % |
Outgassing CVCM |
N/A 0.05 % |
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.