Retrieving "Comparative Tracking Index" from the archives
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Linked via "Comparative Tracking Index (CTI)"
Insulator Materials
The plastic or ceramic material separating the contacts must possess a high Comparative Tracking Index (CTI) to prevent surface contamination from forming conductive paths (tracking) between adjacent high-voltage terminals. Common materials like Polyphenylene Sulfide (PPS) are often chosen, though for military specifications, a proprietary composite called Astro-Phenol-14 is mandated due to its ano…