How to Choose Enameled Wire According to Different Insulating Varnishes?
1.Polyester
The paint film has excellent comprehensive physical and chemical properties and has the unique characteristics of solvent-free paint.
The recommended wire diameter for this kind of painted enameled wire is 0.05-1.0mm. The gauge of the wire is 130. Enameled wire with a bending point of 110-130°C has a wide curing range of insulation. Enameled wire with a bending point of 115-130°C has high penetration rate and high processing speed. You can choose according to your own needs.
If you choose the recommended wire diameter of 0.315-3.0mm, such enameled wire has better flexibility and high thermal impact, and can be used for larger and more precise instruments.The recommended wire diameter is 0.05-1.6mm, with high processing speed, and the wire is reddish gold.
Enameled wire with a wire diameter of 0.05-2.0mm is recommended, and has different characteristics according to different specifications and other data. For example, it has excellent thermal shock resistance, high processing speed, good flexibility and adhesion, etc. The table below details these data.
| Base | Properties of Magnet Wire | Recommended for wire size(mm dia) | Class of Wire | Cut through for 2 min in ℃ | Heat shock at 180 ℃/30 min | Tandelta Bent Point ℃(Solid Block) |
| Polyester | Enamel having wide curing range | 0.05-1.0 | 130 | 280 | 6d | 110-130 |
| Polyester | High cut through and high processing speed | 0.05-1.0 | 130 | 280 | 6d | 115-130 |
| Polyester | Better flexibility and heat shock with high speed | 0.315-3.0 | 130 | 280 | 5d | 110-135 |
| Polyester | High processing speed and reddish golden coloured wire | 0.05-1.6 | 130 | 280 | 6d | 110-125 |
| Polyester | Friendly for environment,enamel without cresol | 0.315-1.0 | 130 | 280 | 5d | 110-135 |
| Modified Polyester | Enamel for thicker gauges with better heat shock | 0.05-2.0 | 130 | 280 | 4d | 115-135 |
| Modified Polyester | Excellent heat shock | 0.05-2.0 | 155 | 300 | 2d | 145-165 |
| Modified Polyester | High processing speed,high cut through and heat shock | 0.05-2.0 | 155 | 320 | 2d | 155-170 |
| Modified Polyester | Good flexibility and adherence | 0.2-5.0 | 130 | 240 | 5d | 100-115 |
2.Polyurethane
Polyurethane paint is polyurethane paint. It has strong paint film, full luster, strong adhesion, water resistance, wear resistance and corrosion resistance. It is widely used in high-grade wooden furniture and can also be used on metal surfaces. Its shortcomings mainly include problems such as foaming when it is wet, and powdering of the paint film. Like polyester paint, it also has the problem of yellowing. The varnish variety of polyurethane paint is called polyurethane varnish.
| Base | Properties of Magnet Wire | Recommended for wire size(mm dia） | Class of Wire | Cut through for 2 min in ℃ | Heat shock at 180 ℃/30 min | Tandelta Bent Point ℃(Solid Block) |
| Polyurethane | Fast solderability good cut through | 0.08-1.8 | 155 | 240 | 2d | 145-165 |
| Polyurethane | Fast solderability good cut through | 0.08-1.8 | 155 | 220 | 2d | 135-155 |
| Polyurethane | High cut through and good solderability resistance to Styrented impregnating resins | 0.05-1.8 | 180 | 260 | 1d | 175-185 |
3. Polyesterimide
A widely used type of wire enamelled enamel, with excellent thermal performance, usually higher than 180 grade, can be single-coated, or used as a primer and polyamide-imide composite line to produce composite lines. It is widely used in refrigerators and air conditioner compressors, washing machine motors, explosion-proof motors, electric tools, ballasts, dry-type transformers and other occasions that require high insulation levels.
| Base | Properties of Magnet Wire | Recommended for wire size(mm dia） | Class of Wire | Cut through for 2 min in ℃ | Heat shock at 180 ℃/30 min | Tandelta Bent Point ℃(Solid Block) |
| Polyesterimide | Properties of Magnet Wire | 0.2-1.6 | 180 | 340 | 2d | 185-195 |
| Polyesterimide | Excellent heat shock cut through property with high enamelling speed | 0.1-1.8 | 180 | 340 | 2d | 185-210 |
| Polyesterimide | Excellent heat shock cut through property with high enamelling speed.UL approved | 0.05-1.8 | 200 | 350 | 2d | 190-205 |
| Polyesterimide | Good Resistance to all solvents good heat shock | Upto 60 sq. mm Rect. | 155 | 260 | 4d | 150-170 |
| Polyesterimide | Excellent heat shock adhesion | 1.6-5.0 | 180 | 320 | 2d | 180-190 |
4. Poly-imide
It is a very good replacement of traditional polyamide-imide wire enamel its cresol soluble and free from NMP so application made easy. Widely used high heat-resistant grade (220 grade) enameled wire varnish is mostly used as topcoat to produce composite wires to improve the overall performance of enameled wires. It is widely used in the production of sealed motors and refrigerant-resistant enameled wires. Some products can also be applied alone. In order to improve the performance of the enameled wire, it can also be made into a self-lubricating type and a filling type. There are increasingly important applications in the heavy motor and automotive industries.
| Base | Properties of Magnet Wire | Recommended for wire size(mm dia） | Class of Wire | Cut through for 2 min in ℃ | Heat shock at 180 ℃/30 min | Tandelta Bent Point ℃(Solid Block) |
| Poly-imide | It is a very good replacement of traditional polyamide-imide wire enamel its cresol soluble and free from NMP so application made easy. | 0.05-1.6 | 220 | 360 | 2d | 220 |