Comparative Tracking Index (CTI) - UL 746 Test Standard Explained

Comparative Tracking Index (CTI) - UL 746

The voltage which causes tracking after 50 drops of 0.1% ammonium chloride solution have fallen on the material. The results of testing at 3 mm thickness are considered representative of the material's performance in any thickness.

Tracking is an electrical breakdown on the surface of an insulating material. A large voltage difference gradually creates a conductive leakage path across the surface of the material by forming a carbonized track.

Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.

Similar Standards

• IEC 60112

Property information for specific grades of resin are available in the Prospector.
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