Puncture resistance, electrical

High electrical voltages can cause electrical burn-through or puncture. Electrical puncture resistance is the quotient of the voltage at which puncture occurs and the distance between the conductive parts to which the voltage is applied (i.e. thickness d of the test specimen) ... 

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). 

Polyethylene (PE) Plastic Made from a mixture of UHMW PE powder, fine silica powder, and mineral oil. The mixture is extruded as a film, calendered, and made porous by extraction Fine pore size, low electrical resistance, high puncture resistance, and strongly resistant to oxidation... 

Types Toe protection Metatarsal protection Puncture resistant Electrical insulation Other (Explain) ... 

Copolymers of butadiene, acrylonitrile and a third monomer that contains a carboxylic acid group (usually methacrylic acid). Gloves made from this copolymer are often termed nitrile . The particular advantages of this polymer are resistance to many solvents and excellent mechanical protection (abrasion and puncture resistance). Nitrile also has a significantly lower surface electrical resistivity than natural rubber, and therefore finds use in gloves for use in areas where static electricity might be a problem. 

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

This phenomenon can be explained in terms of the variation kinetics of the electrical resistance of systems with punctured films (Fig. 2.59b). In contrast to non-plasticized films, for which R diminishes with time, the resistance of the plasticized samples increases as a result of, firstly, incrementing oil content in the film, and secondly, filling of the puncture hole in the film with a hydrophobic mineral oil through S3meresis [72]. 

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