Frequently Asked Questions


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and Other Metals

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or diagnosing

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Environmental & Toxic
Substance Regulations

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Magnet Wire Questions

It is an insulated copper or aluminum conductor typically used to wind electromagnetic devices such as motors and transformers. The insulation may be a thin film of varnish called enamel; a fibrous polyester or fiberglass yarn; or a combination of both enamel and fibrous insulations. The fibrous insulation may be impregnated with a varnish to bind the insulation to the conductor and enhance thermal endurance. Other conductors such as copper and nickel alloys, pure nickel, precious metal plated copper and pure precious metals can also be coated with film insulation for custom applications.

Litz Wire Questions

Both are twisted multi-conductor products that find use in RF applications but otherwise the two are substantially different. While litz wire may be produced with 15 or fewer individual strands, for high frequency applications the constructions often consist of many bundles with up to 2000 individual strands of ultrafine wire. Litz wire is constructed with a loose lay (<0.25 to 2 twists per inch) to minimize the lineal increase in resistance produced by twisting and individual wires are insulated with single build insulation to maximize the cross sectional area of copper conductor. Polyurethane base insulation is used almost exclusively for the individual wires due to its low RF loss characteristic, wide availability and moderate cost. The constructions of fine and ultrafine strands may be helically wrapped with nylon or other textile yarn to bind and maintain the litz wire in a circular configuration and to protect the thin film insulation coatings from abrasion. In recent years extruded coatings such as FEP have been used in place of a textile serve. Twistite™ Magnet Wire is usually fabricated from just two to ten individual strands that are twisted much tighter, up to 50 twists per inch. Twistite™ products may be constructed from any film insulation type from Class 105 to Class 240 and individual strands may be coated to heavy, triple or quad builds to suit the application. Twistite™ strands are often individually color coded for easy identification whereas this feature is not a concern in litz constructions.

Aluminum and Other Metal Questions

The conductivity of electrical conductor grade aluminum wire (Alloy 1350-0) is 61.8% of the equivalent cross-sectional area of annealed ETP copper. Therefore aluminum wire must have 1.6 times the cross sectional area for a given copper wire in order to achieve a comparable DC resistance.

Other Questions

No – we specialize in copper wire with an accent on fine sizes.

Troubleshooting Questions

Polyimide insulated magnet wire is rated to operate continuously at 240 degrees (c) (see ‘How is the temperature class for magnet wire determined?’). However, the magnet wire may handle temporary spikes in temperature up to 400o degrees (c). Keep in mind that excursions above the rated temperature can shorten the life of any electrical component..

Buying from Us Questions

Yes, we all accept most major credit cards.

Environmental & Toxic Substance Regulation Questions

No, however MWS has a decades-long record of comprehensive, conscientious environmental regulatory compliance and has taken proactive steps to reduce waste, manage environmental impacts and conserve raw materials and energy. The latest is a facility-wide project upgrading interior lighting to energy efficient T8 lamps and electronic ballasts controlled by occupancy sensors. In 2007 MWS installed a 155 kW photovoltaic solar electric generating system that supplies nearly 50% of the company’s energy needs while transmitting power back to the grid on weekends and holidays when the business is closed. MWS is also a past winner in the Waste Reduction Awards Program sponsored by the California Integrated Waste Management Board.