logo.gif (5139 bytes) Insulation Characteristics and Applications

Click here to view Insulation Specifications
Back to Main page





105 C

Plain Enamel PE Plain enamel magnet wire is insulation with a film  of conventional oleoresinous enamel. Enamel has good adherence, flexibility, thermal and solvent resistance. Enamel requires mechanical stripping prior to soldering. High production relays and coils. Avoid using in presence of synthetic solvents.
Formvar F Formvar magnet wire is insulated with vinyl acetal resin, as a smooth uniform film. Formvar has excellent mechanical properties such as abrasion resistance and flexibility. The film will withstand excessive elongation without rupture. When stressed during winding, Formvar has a tendency to craze upon contact with solvents such as toluol, naphtha, xylol, etc.; therefore, it should be given an annealing preheat prior to varnish application. Formvar can be removed mechanically of chemically during thermal preparation. Motors, random wound coils, oil filled and dry transformers, armature and generator winding where "tough" film may be required
Polyurethane Bondable PB Bondable magnet wire is insulated copper wire with a superimposed film of thermoplastic bonding material. The heat or solvent sensitivity of this material makes possible the winding of coils of unusual shapes since the wire may be bonded turn to turn. Self-supporting coils, voice coils, encapsulated coils, relays, yoke coils
Formvar Bondable FB
Polyurethane Nylon Bondable PNB

130 C

Polyurethane-Nylon PN Polyurethane-nylon combines the magnet wire insulation characteristics of polyurethane with the advantages of a nylon topcoat. With the nylon, polyurethane-nylon is still readily solderable, yet the solvent resistance and thermal stability of the insulation is excellent. In addition, the nylon provides improvement in the windability and allows more severity in the winding operations. The scrape resistance and flexibility are good enough to readily accept winding in automatic machines. With the nylon protection over the polyurethane insulation, preheat prior to varnishing is not necessary. Appliance motors, relays, timer and clock coils, encapsulated coils, solenoids, torroidal coils, random wound coils.

155 C

Polyurethane-155 P155 A high temperature polyurethane that exhibits similar properties to the older class 130 C polyurethane with thermal characteristics of a 155 C insulation while soldering at 390 C. Motors, R.F. coils, relay, encapsulated coils, ignition coils, solenoids, low voltage transformers, layer and precision wound coils.
Polyurethane Nylon-155 PN155 Similar to the 130 C class polyurethane-nylon except with the thermal characteristics of a 155 C insulation and solderable at 430 C (14 - 23 AWG ) and 390 C (24 - 56 AWG) See Polyurethane 130 C

180 C

Polyurethane-180 P180 Polyurethane-180 combines the thermal properties of a class 180 C insulation, while offering low temperature solderability at  390 C. Automotive relays, ignition coils, in transformers, in solenoids.
Polyurethane Nylon-180 PN180 Poly-Nylon-180 offers excellent abrasion resistance to ferrite core coils and transformers, while exhibiting high temperature thermal stress and low temperature solderability at 390 C. Relays, pulse transformers, torroid coils, small appliance motors.
Polyester-imide PT Polyester-imide magnet wire is insulated with a Class H modified polyester resin. It has excellent thermal endurance, solvent resistance and exhibits a low coefficient of friction to improve windability. It requires mechanical or chemical stripping. Appliance and tool motors, continuous operation coils, subfractional instrument and servo motors, solenoids.
Polyester Nylon PTN Polyester-nylon is a film insulation with a modified polyester basecoat and a nylon topcoat. Typical of a dual coat construction, advantage is taken of the high thermal properties of the polyester and the mechanical properties of the nylon. Fractional and integral horsepower motors, coils and relays, control and dry transformers, encapsulated coils, D.C. field coils
Solderable Polyester SPT Solderable polyester magnet wire is an ester-imide insulated wire which solders at 470¡ C. Electrical, chemical and thermal properties indicate that the film will qualify for use as class 180¡ C material. Since thermoplastic flow values equal or exceed 280¡ C, the insulation has shown excellent promise in transfer molding applications. Special transformer coils, automotive coils, electronic coils.
Solderable Polyester Nylon SPTN Solderable polyester-nylon magnet wire is a two part insulation system in which ester-imide basecoat is overcoated with nylon. This wire solders at 470 C. The construction may be considered a substitute for applications where ester-imide insulation wire is used, with the added features of improved solvent resistance and improved windability. Shade pole motor coils, special control coils, automotive coils.
Polyester-imide Bondable PTB Self-bonding polyester actually describes a number of possible constructions of polyester base insulation with a thermo-plastic bond coat. The bond coat may be epoxy or polyesters. It needs to be borne in mind for design purposes that the addition of the bond coat does add one overall build level to the wire dimension. Television yoke coils, clutch and brake coils, helical and toroidal coils.
Polyester-amide-imide Bondable APTB
Solderable Polyester Bondable SPTB

200 C

Glass Fibers GLASS Both glass and dacron glass are a served filament on the magnet wire conductor. They are available as unvarnished or varnished with organic or silicone varnishes. The fibers may be served over bare conductor or over film constructions. The glass is a continuous filament glass yarn and the dacron glass is a combination of glass and polyester fibers. The advantage of the glass is its high resistance to overload burnout and the advantage of the dacron glass is its abrasion resistance and better flexibility than glass. The dacron glass can be purchased fused and unvarnished. Dry transformers, Class B motors.
Dacron Glass DGLAS
Polyester-200 PT200 Polyester-200 is a modified theic-polyesterimide single coat one part system. It has high temperature thermal properties and good chemical resistance. Normally produced in sizes 34 -56 AWG Motors, small coils, transformers
Polyester A/I Topcoat APT

Polyester-amide-imide magnet wire is a two part insulation consisting of a modified polyester basecoat with a super-imposed amide-imide outer coating. This wire exhibits exceptional windability, heat shock resistance, and ability to withstand overloads. Chemical resistance to most solvents and insulating varnishes is extremely good. It is not softened by refrigerants and extractions are essentially zero.

Fractional and integral horse power motors(hermetic and open), automotive and hand tool armatures, dry type transformers.
Polytetrafluoloethylene (Teflon*) TEFLON High heat resistance, excellent resistance to most solvents, acids and corrosive chemicals.   High dielectric constant. Miniature rotating components and windings where severe environments are encountered.

240 C

Polyimide-ML ML ML is a film coated magnet wire made with polyimide resin. It is a Class 240 C thermal life insulation with exceptional resistance to chemical solvents and burnout. It will operate at a temperature up to 240 C. The outstanding cut-thru of over 400C and its ability to withstand excessive overloads extends the use of magnet wire in extreme conditions. ML is unaffected by prolonged exposure to varnish solvents and its compatible with virtually all systems. Fractional and integral horsepower motors, high temperature continuous duty coils and relays, hermetic and sealed units, heavy duty hand tool motors, encapsulated coils.
Click here to view Insulation Specifications
* Registered trademark DuPont Corp.
Back to Main Page