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Comparative Tracking Index (CTI) ASTM D3638

This method is used to assess the relative resistance of insulating materials to tracking.

Close-up of electrical testing inside laboratory

 CTI / TRACKING ASTM D3638

 

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

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