When silicone contamination is a concern, finding a thermal insulator pad that still conducts heat reliably can be a challenge. Parker Chomerics CHO-THERM T444 is a beige non-silicone thermal pad designed for exactly that situation. Its 0.003-inch low-profile construction and optional pressure-sensitive adhesive backing make it a practical drop-in replacement for greased mica in silicone-sensitive applications. At NEDC, we convert and stock CHO-THERM T444 in custom die-cut sizes for customers who need both electrical isolation and a clean silicone-free interface.
Key Specifications
- Material: Non-silicone filled polyimide with optional PSA
- Thickness: 0.003 in (0.08 mm) with plus or minus 0.0005 in tolerance
- Color: Beige
- Thermal Conductivity: 0.4 W per meter-Kelvin (ASTM D5470)
- Thermal Impedance at 300 psi: 0.37 degrees C-inch squared per watt
- Voltage Breakdown Dry: 5,000 Vac per mil (200 kVac per mm, ASTM D149)
- Volume Resistivity Dry: 10 to the 14 power ohm-cm (ASTM D257)
- Tensile Strength: 3,000 psi (20.7 MPa, ASTM D412)
- Hardness: Shore A 90 (ASTM D2240)
- Specific Gravity: 1.70 (ASTM D792)
- Flammability: UL 94 V-0 (See UL File E140244)
- Heat Capacity: 1 J per gram-degree C (ASTM E1269)
- Coefficient of Thermal Expansion: 400 ppm per degree C (ASTM E831)
- Operating Temperature: minus 40 to 392 degrees F (minus 40 to 200 degrees C)
- Shelf Life: 12 months from shipment (with PSA)
Why Choose CHO-THERM T444?
T444 stands out for two reasons. First, its non-silicone construction makes it compatible with assemblies where silicone contamination could interfere with downstream processes such as conformal coating or optical bonding. Second, its 0.003-inch profile makes it one of the thinnest electrical insulators in the CHO-THERM family. That keeps thermal impedance low despite moderate bulk conductivity, making it ideal for tight-gap assemblies.
Typical Applications
- Consumer electronics with thin form factors
- Automotive modules where silicone outgassing is restricted
- Telecommunications hardware with low-clearance boards
- LED lighting and display inverters
NEDC supplies CHO-THERM T444 in standard configurations and custom formats. Available options include die-cut parts on continuous rolls, slit roll stock, and individual sheets with or without PSA. For standard roll formats, contact our team through the NEDC contact form. You can also learn more about our full range of gap filler pads.
For more on the CHO-THERM family, see T441 for a silicone alternative, T609 for higher conductivity, or 1674 for more mechanical strength.