Kappa 438 laminates offer dielectric constants (Dk) tailored to FR-4 industry standard norms which facilities ease of converting existing FR-4 designs where better electrical performance is needed.
Please see below for a sampling of data for this material formulation. For detailed material information and to use advanced features such as filtering, visit the Laminate Properties Tool.
| Kappa™ 438 | |
|---|---|
| Dielectric Constant, @10GHZ (2.5 GHz) Typical (Process) | 4.10+/-0.08 |
| Dielectric Constant, @10GHZ (2.5 GHz) Typical (Design) | 4.38 |
| Dissipation Factor TAN @10 GHz (2.5 GHz) (Typical) | 0.005 |
| Thermal Coefficient εr -50°C to 150°C ppm/°C (Typical) | -21 |
| Volume Resistivity Mohm (Typical) | 2.9x109 |
| Surface Resistivity Mohm (Typical) | 6.2x107 |
| Water Absorption D48/50% (Typical) | 0.12 |
| Thermal Conductivity W/m/°K (Typical) 50°C ASTM D5470 | 0.64 |
| Coefficient of Thermal Expansion -55° to 288°C ppm/°C (Typical) X | 13 |
| Coefficient of Thermal Expansion -55° to 288°C ppm/°C (Typical) Y | 16 |
| Coefficient of Thermal Expansion -55° to 288°C ppm/°C (Typical) Z | 42 |
| Peel Strength 1 oz (35um) ED Foil lbs/in. (N/mm) (Typical) | 5.8 |
| Density gm/cm3 (Typical) | 1.99 |
| Flammability Rating UL94 | V-0 |
| Lead-Free Process Compatible | Y |
| PIM dBc Typical |
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