Surface arc resistance

The arc resistance of a material is the time taken for the conductivity path to develop on the surface as the result of an arc passing between electrodes placed near the surface. [Pg.97]

Good arc resistance is necessary in conditions where high voltage discharges are unavoidable. Arc resistance is reduced by fire retardants. Arc resistance is highly [Pg.97]

Details of the equipment for carrying out this measuraneut according to ASTM D495-99 [8] are given in Table 5.1. [Pg.134]

Very few polymers have excellent surface arc assistauce. These are high-deusity polyethylene polypropylene, polyethylene terephthalate, and polymethyl methacrylate. [Pg.134]

Surface and interface analysis techniques, 24 73t, 75-116 Surface arc resistance, of... [Pg.910]

The surface arc-resistance of PTFE resins is high and is not affected by heat aging. They do not track or form a carbonized path when subjected to a surface arc in air.39... [Pg.39]

Polymer Filler Volume resistivity (Ohm- cm) Dielectric strength (mV/m) Dielectric constant (1 kHz) Dissipating factor (1 MHz) Surface arc resistance (Ohm) Tracking resistance (Ohm) Volume resistivity (Ohm/m) Dielectric strength (mV/m) Dielectric constant (IkHz Ohm) Dissipation factor (1 MHz) Surface arc resistance (Ohm) Tracking resistance (Ohm)... [Pg.129]

The incorporation of a fire retardant additive, in the case of some polymers, produces a deterioration in surface arc resistance and tracking resistance. [Pg.131]

Polymer Grade Volume resistivity (ohm.cm) Dielectric strength (mV/m) Dielectric constant at 1 kHz Dissipation factor at 1 kHz Surface arc resistance Tracking resistance... [Pg.94]

In general addition of 10-60% glass fibre causes an improvement in the dissipation factor in PC and PA 6,6, and in surface arc resistance in PPO and epoxy resins but causes deterioration of dielectric constant in PA 6,6 and in tracking resistance of PP epoxies and phenylene oxide. Glass fibre caused an improvement in the dielectric strength of epoxies. [Pg.104]

In general, carbon fibres causes a deterioration of volume resistivity in epoxy resins or PTFE, and improves the dielectric strength and dielectric constant in epoxies but causes deterioration of surface arc resistance and tracking resistance in epoxies. PTFE causes deterioration in the dielectric constant and surface resistance in PA 6,6. Mineral fillers also cause deterioration of the dielectric constant and surface arc resistance of PA 6,6. [Pg.105]

In general, 10%-60% glass fiber causes improvement in the dissipation factor in polycarbonate and polyamide 6,6 and in the surface arc resistance in polyphenylene... [Pg.135]

Volume resistivity 16.7 ohm.cm Dielectric strength 19 mV/m Dielectric constant at 1 kHz 3.2 Surface arcing resistance Very good Tracking resistance Good Dissipation factor 0.0016... [Pg.136]

Carbon fibers cause a deterioration of volume resistivity, and arc resistance in polyamide 6,6. Mineral fillers also decrease the dielectric constant and surface arc resistance in polyamide 6,6. This is confirmed by a comparison of electrical, mechanical, and thermal properties of polyoxymethylene, where the incorporation of 30% carbon fiber reduces volume resistivity and dielectric strength, in addition to a distinct improvement in tensile strength at heat distortion temperature (Table 5.10). [Pg.137]

The incorporation of a fire retardant additive, in the case of some polymers, produces a deterioration in surface arc resistance and tracking resistance. This has been observed in the case (Table 12.3) of diayllyl phthalale, polyamide 6,6 and polybutylene terephthalate. A slight deterioration in dissipation factor was also observed in the cases of polybutylene terephthalate, polyphenylene oxide, and polypropylene. [Pg.227]

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