Magnetics Business & Technology - July/August 2019 - 9

FEATURE ARTICLE
Laminate grade flexible insulations were created to bridge
the gap between the high dielectrics of the PET film with
poor thermal properties and the high thermal stability of
the aramide paper with low dielectric properties. The typical construction of laminate insulation is aramide fiber/
PET/aramide fiber. Typically, an adhesive is necessary to
hold the aramide and the PET together and is the weak
link in the overall construction.
Poly (amide-imide) resins (PAI) were first commercially
available as electrical insulating magnet wire coatings in
the 1960s. Since this time, PAI resins are standard coatings on most magnet wire constructions used in industrial
applications. Outstanding characteristics include high
thermal performance, chemical and abrasion resistance,
and low coefficient of friction. The use of PAI resins outside
of wire enamels has been limited due to high temperature
of cure and lack of physical properties due to low molecular weight of the resin. The ELAN-Film HT-180 insulation
was born out of the desire to combine the PAI resin with a
base film to make a flexible insulating composite material
to be used in motors, generators, transformers, and other
electrical devices.
Material Construction
ELAN-Film HT-180 insulation is a composite material constructed of 13 microns of PAI resin coated on both faces
of varying thicknesses of PET base film. The PAI resin

is specifically formulated to maintain the high thermal resistance inherent in polyamideimide resins but also to accomplish excellent film forming properties of a high molecular weight material.
The PET layer can vary in thickness from 25 microns to
317 microns. The PAI layer on both the front and the back
face is always 13 microns. The 25 microns of PAI film is
responsible for the UL listing of 200 as tested by UL 1446.
The construction is modeled after and similar to MW35
magnet wire. MW35 has a polyester base coat with poor
thermal properties with an overcoat of PAI for thermal performance, chemical resistance, abrasion resistance, and
low coefficient of friction.
Electrical Properties
The electrical properties of ELAN-Film HT-180 insulation
are outlined and compared to competitive films of similar
thicknesses in the accompany tables. Three conditions
were applied to each film. The films/papers were first
dried at 80 degrees C overnight to remove water. Dielectric breakdown was then measured and normalized on
volts per mil. The films were then immersed in water for
24 hours at 25 degrees C. A third sample was placed
in a 100% humidity chamber at 40 degrees C. Dielectric
breakdown was then measured on each of these samples.
Continued on page 10...

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Magnetics Business & Technology - July/August 2019

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