Arc resistance (D495)
Arc resistance, in accordance with ASTM-D495, is expressed as the number of seconds that a material resists the formation of a surface-conducting path when subjected to an intermittently occurring arc of high voltage, low current characteristics. The results of testing the nominal 3 mm thickness are considered representative of the material's performance in any thickness.
| D495 range | PLC |
| 420 and longer | 0 |
| 360 through 419 | 1 |
| 300 through 359 | 2 |
| 240 through 299 | 3 |
| 180 through 239 | 4 |
| 120 through 179 | 5 |
| 60 through 119 | 6 |
| Less than 60 | 7 |
