Puncture strength, electrical

Brand name Backweb thickness (mm) Electrical resistance ( mficnr) Oil content (%) Porosity (%) Puncture strength (N) Supplier... 

Dielectric strength (electric strength) n. A measure of the voltage required to puncture an insulating material, expressed in volts per mil of thickness (SI V/rrmi). The voltage is the root-mean-square voltage difference between the two electrodes in contact with opposite surfaces of the specimen at which electrical breakdown occurs under prescribed test conditions. Ku CC, Liepins R (1987) Electrical properties of polymers. Hanser Publishers, New York. Weast RC (ed) (1971) Handbook of chemistry and physics, 52nd edn. The Chemical Rubber Co., Boca Raton, FL. 

Permeability Porosity Pore size Thickness Chemical composition Thermal stability Mechanical strength Electrical resistivity, voltage drop, air flow Calculated from dimensions, basis weight, and skeletal density Image analysis, Hg porometry Micrometer Atomic absorption, differential scanning calorimetry, others Hot electrical resistivity, thermal-mechanical analysis Tensile properties, puncture strength... 

U.S. market is about 20 million pounds per year. The applications are those where one needs very high flame resistance (clothing for firefighters and welders, welder s protective shield, upholstery and drapes), heat resistance (ironing board covers, insulation film for electrical motors and transformers, aerospace and military), dimensional stability (fire hose, V- and conveyor belts), or strength and modulus (circuit boards, bulletproof vests, fiber optic and power lines, ship mooring ropes, automobile tire cord, puncture-resistant bicycle tires). 

Dielectric strength. The electric stress, measured in volts, at which a given thickness of dielectric material breaks down and is punctured by an electric discharge. 

The maximum power density at which a corona reactor can be operated without puncturing the barrier is a function of the dielectric strength of the barrier material, the total thickness of the barrier, the ambient temperature in which it is operated, and the gap spacing between barriers. The dielectric constant of the barrier affects both the voltage gradient across the barrier, and the corona power which can be dissipated in the reactor. The dissipation factor is a measure of the electric losses which produce heating of the barrier. 

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