Pyralux HP Dk and Df
DuPont Pyralux HP: Dk 2.8 and Df 0.0035 at 10 GHz (HP250000 sheet adhesive, ASTM D2520). In the pcbplanner material library it is listed under flex materials materials.
Datasheet values
| Entry | Dk | Df | at | Tg | Construction and test method |
|---|---|---|---|---|---|
| Pyralux HP epoxy adhesive | 2.8 | 0.0035 | 10 GHz | — | HP250000 sheet adhesive, ASTM D2520. |
| Pyralux HP composite coverlay | 3.0 | 0.0045 | 10 GHz | — | HP252500 complete film/adhesive composite. Do not assign the composite Dk to both individual plies. |
Dk and Df depend on the glass style, the resin content and the test method, so the same product has different values in different constructions. Compare materials at the same frequency and, where possible, with the same method; for a construction not listed here, use the manufacturer’s construction table.
Dk and Df from 1 to 20 GHz
The datasheet gives one frequency. The table extends that point with the Djordjevic–Sarkar wideband Debye model, the same model the impedance and trace-loss calculators use: it keeps Df nearly flat and lets Dk fall slowly with frequency. These are model values, not measurements.
| Entry | 1 GHz | 2 GHz | 5 GHz | 10 GHz | 20 GHz |
|---|---|---|---|---|---|
| Pyralux HP epoxy adhesive | 2.81 / 0.0036 | 2.81 / 0.0036 | 2.80 / 0.0036 | 2.80 / 0.0035 | 2.80 / 0.0034 |
| Pyralux HP composite coverlay | 3.02 / 0.0046 | 3.01 / 0.0046 | 3.01 / 0.0046 | 3.00 / 0.0045 | 2.99 / 0.0043 |
Each cell is Dk / Df.
Use it in a calculation
- Impedance and trace width on Pyralux HP epoxy adhesive · insertion loss per inch
- Impedance and trace width on Pyralux HP composite coverlay · insertion loss per inch
Similar materials
- DuPont Pyralux AP – Dk 3.2 and Df 0.003 at 10 GHz
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Sources
- DuPont Pyralux HP adhesive data sheet EI-10208. HP250000: Dk 2.8, Df 0.0035 at 10 GHz, ASTM D2520.
- DuPont Pyralux HP coverlay data sheet EI-10209. HP252500 composite coverlay: Dk 3.0, Df 0.0045 at 10 GHz, ASTM D2520. Use for the complete film/adhesive composite, not each constituent.