Amortization Seams for Mold Cavity Surface Treatment Failure Risk between Toolmaker and Molder
Decouple cavity surface treatment warranties from tool steel structural guarantees in procurement RFQs to allocate early recoating costs fairly.
Dielectric Isolation Tracking
Meaning
Electrical breakdown phenomena involve the progressive formation of conductive carbonized paths across the surface of solid insulating materials due to high voltage stress. This degradation mechanism, known as dielectric isolation tracking, occurs when localized discharges decompose the polymer matrix under electric fields. It is a critical safety consideration for high-voltage battery pack housings and terminal barriers.
Tracking Progress
Contaminants and moisture deposit on the insulating surface to form conductive films that carry leakage currents. These currents generate localized heating, vaporizing the moisture and creating dry bands where micro-arcs initiate to carbonize the polymer.
Material Resistance
Comparative tracking index measurements quantify the resistance of plastic housings to this specific breakdown process. High-voltage insulation requires materials with high index values to prevent fire risks.
Design Rule
Creepage distances must be designed with sufficient margin to minimize the risk of discharge propagation under humid conditions. Geometric barriers and molded ribs interrupt continuous leakage paths across the plastic surfaces.