CTI / tracking ASTM D3638
This method is used to assess the relative resistance of insulating materials to tracking.
| Test specimen | ≥50 mm x ≥50 mm x ≥2,5 mm |
| Test voltage | Between 100 V and 600 V (50 Hz) in 25 V steps |
| ASTM Test solution | 385 Ωcm |
| Drop volume | 20 mm³ |
| Failure criteria | Current on breaking ≥0,9 A >0,5 s material burns |
Results of the test method:
The results of testing the nominal 3mm thickness are considered representative of the material’s performance in any thickness.
| PLC | CTI |
|---|---|
| 0 | 600 ≤ CTI |
| 1 | 400 ≤ CTI < 600 |
| 2 | 250 ≤ CTI < 400 |
| 3 | 175 ≤ CTI < 250 |
| 4 | 100 ≤ CTI < 175 |
| 5 | 0 ≤ CTI < 175 |
