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The Comparative Tracking Index or CTI is used to measure the electrical breakdown (tracking) properties of an insulating material. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to heat chars the material, and the char is more conductive than the original insulator, producing more current flow, more heat, and eventually complete failure.
High comparative tracking index polycarbonate compositions with improved flame retardant and hydro-stability properties
Polycarbonate compositions include: (a) from about 45 wt% to about 90 wt% of a polycarbonate homopolymer; (b) from about 1 wt% to about 25 wt% of a polycarbonate copolymer; (c) from about 0.1 wt% to about 20 wt% of a first flame retardant component including a brominated flame retardant; (d) from about 0.01 wt% to about 1 wt% of a second flame retardant component including an alkyl sulfonate salt, an aromatic sulfone sulfonate, an aromatic sulfonate salt, or a combination thereof; and (e) from about 0.1 wt% to about 20 wt% of a siloxane-free acrylic core-shell impact modifier. The combined weight percent value of all components does not exceed 100 wt%, and all weight percent values are based on the total weight of the composition.
Owner:SHPP GLOBAL TECH BV