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Celanese Insulated Litz Wire
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Celanese was the first synthetic yarn used for insulation of wire. It was introduced by the Celanese Corporation of America in 1934 as a substitute for silk, then the only high-grade insulating yarn available. Celanese was immediately accepted in electronic coil operations due to its excellent radio frequency characteristics. Celanese is an acetate. Chemically it is an acetic acid ester of cellulose, which differs in physical, chemical and electrical properties from regenerated cellulose and cotton.
The operating temperature rating is 105°C. As with other ether thermoplastic yarns, celanese will stick, soften, and melt at elevated temperatures. Softening and sticking occur at 190-205°C, and melting occurs at about 260°C, well below the soldering temperature of polyurethane film insulated wire |
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Celanese is soluble in acetone. Since celanese yarn dissolves and fuses when wet with acetone, this property may be used to fabricate the coil and to facilitate winding operations. A controlled amount of acetone can be applied to the wire as it is being wound, and, when the coil is completed, the acetone can be evaporated with a blast of hot air, leaving the winding firmly cemented.
The layer-to-layer dielectric strength of celanese insulation is 100 volts per mil minimum. Tests performed on celanese insulated wire wound coils at radio frequencies show them to have excellent Q values. |
Most textile fibers absorb moisture from the surrounding atmosphere. The amount present is referred to as moisture regain, and is expressed as a percentage of the oven-dry weight. The standard regain of celanese at 70°F and 65% RH is generally accepted as 5.5%.
Celanese insulated wire normally comes in the natural color (white). Other colors can be supplied for coil or lead identification purposes. These would include green, red and blue. |
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