At SRT Plastics, we provide the technical data and precision-fabricated components necessary to meet the CTI (Comparative Tracking Index) requirements defined in IEC 60112. Surface tracking is a critical safety concern in electrical engineering, where a conductive path can form across an insulating surface due to contamination and voltage stress. A higher CTI class indicates a material’s superior resistance to this tracking, which in turn allows engineers to design more compact layouts by reducing the required creepage and clearance distances. We specialize in machining terminal covers, shields, and insulating plates from materials with verified CTI ratings, ensuring your assemblies remain safe, reliable, and compliant with international electrical standards.
CTI is determined by a standardized test that applies a contaminant and voltage to the material surface. The measured value places the material into a CTI class. A higher class indicates greater resistance to tracking. Use CTI together with creepage and clearance design rules from your product standard. We can help align material choice with your required class.
Near busbars or terminals a higher CTI class can allow more compact layouts within the rules of the product standard. Always confirm that the grade used in production matches the CTI value in design documentation. We can propose available grades and keep the traceability clear from sheet supply to finished parts.
We supply a Certificate of Conformity for fabricated parts and can share supplier data sheets and test reports where available for the selected grade. Keeping a clear record of grade color and thickness supports audits and repeat orders. Ask us for a material and document pack with your shipment.
