The Comparative Tracking Index (CTI) is a parameter used to evaluate the resistance of insulating materials to electrical tracking. 

A summary of testing capability in ADL supporting CTI tests is listed below. More technical details can be found here.

Capability DescriptionsSolvay Labs

Voltage: 0~600 VAC

Standards: IEC 60112, ASTM D3638

ADL Alpharetta

Voltage: 0~1000 VAC

Standards: ASTM D3638

ADL Alpharetta
Voltage: 100~600 V
Standards: UL746A, IEC 60112,IEC 60335, GB2099.1, GB/T4207, GB4706.1, ASTM D 3638-92		ADL GCN