Isomid is a Thermal Class 200, THEIC modified, polyesterimide wire enamel that meets the requirements of NEMA MW1000, MW30 or MW74 when applied as a basecoat, MW76 (when applied with a Nylon topcoat), and MW35 or MW73 (when applied with an Aminide topcoat). Topcoat applications serve the purpose of reducing coefficient of friction during winding/insertion.
These coating combinations can be applied as a basecoat when self-bonding magnet wire is required for a customer’s specific coil winding/forming operation.
Isomid is not directly solderable and must be removed prior to completing electrical component connections.
Electrical properties
| NEMA MW1000 |
ASTM D1676 |
IEC 851 | JIS C3003 | MW 30/74-C (Heavy), 18 AWG |
MW 76 C (Heavy), 18 AWG |
MW 35/73-C (Heavy), 18 AWG |
|
| Dielectric strength @ 25°C |
3.8.1.1 | 69-75 | 13-4.2,3,4 | 11.1 | 13.0 kV | 11.7 kV | 13.5 kV |
| Dissipation factor @ 170°C - 1kHz |
107-114 | 0.06 | 0.08 | 0.05 | |||
| Tangent delta (DIN) | 190°C | 55/ 186°C |
192°C |
Mechanical properties
| NEMA MW1000 |
ASTM D1676 |
IEC 851 | JIS C3003 | MW 30/74-C (Heavy), 18 AWG |
MW 76 C (Heavy), 18 AWG |
MW 35/73-C (Heavy), 18 AWG |
|
| Adherence and flexibility | |||||||
| No snap | 3.3.1.1 | 141-148 | 8.1 | Pass | Pass | Pass | |
| 20% snap | 3.3.1.1 | 141-148 | 8.5.1.1 | Pass | Pass | Pass | |
| Cut-through temperature | 3.50.1.1 | 61-68 | 370°C | 317°C | 360°C |