Materials

Insulating materials.
Depending on the functionality and duration of the machine, they are the most sensitive to thermal stresses, both electric and mechanical. The principle properties of insulating materials are: the dielectric strength (the maximum voltage difference that the material can support without discharge), the dielectric constant, and the thermal conductivity. An increase in 10° C of operating temperature roughly halves the life of a dielectric. Based on the properties of resistance to temperature, the following insulation classes are defined: A 105 °C, E 120 °C, B 130 °C, F 155 °C, H 180 °C, C over 180 °C.

Nomex/Mylar/Nomex
omex/Mylar/Nomex is derived as the laminate of a thin film of polyester between two layers of aramid Nomex (Du Pont). Each layer of aramid Nomex is 0.050mm thick which, by varying the thickness, allows for a wide range of  laminates. Maximum operating temperatures: Class F 155°C (IEC 60626) – Class H 180°C (UL 1446). Minimum operating temperature: Nomex® -200°C / Resin –60°C / Polyester –60°C

Glass Silicone tube scs 7
Temperature class: C Operating temperature range: from -60°C to +250°C with peaks at +290°C (for up to a few hours) Dielectric Stiffness: from 1.5 to 15 kV  
Flammability: Auto-extinguishing
Good mechanical strength
Resistance to transformer oils according to UTEC 93641
Good compatibility with class C paint
Complies with RoHS 2002/95/CE

Nomex/Kapton/Nomex
The flexible laminate insulator N.K.N is derived from of a film of polyimide Kapton HN (Du Pont) inserted between two strips of aramid Nomex (Du Pont). It is possible to obtain a wide range of laminate thickness because in addition to varying the Nomex thickness, it is also possible to vary the thickness of the Kapton film. Maximum operating temperature: Class H 180° C (CEI 85) / Class N 200° C (UL 1446). Minimum operating temperature: Nomex -200° C / Resin -60° C / Kapton -269° C

Radox Cable
Nominal voltage: 600 V
Operating temperature: from -55 to +150°C  Class F. Radox UL/CSA cables are unipolar whose insulation is cross-linked by irradiation (??). They resist high pressure and temperatures, with excellent mechanical properties and good resistance to chemical agents. Briefly reaching temperatures of up to 250° C does not damage the insulation. They are compatible with paint (??) and resin, and they retard the propogation of fire.

Nomex Adhesive Tape
Nomex 50 adhesive tape consists of a strip of aramid Nomex bonded to an acrylic adhesive.
Maximum operating temperature: Class F 155°C
Characteristics: suitable for the insulation of power transformers, coils, and heads of motor windings