Lumirrorâ
Polyester Film
Toray "Lumirrorâ" polyester
film, is made from polyethylene terephthalate which has
the following molecular structure:
This polymer is formed by the polycondensation reaction
of terephthalic acid and ethylene glycol. "Lumirrorâ"
is made by extruding the polymer in a melted state into
a sheet form, stectching it in the machine and transverse
directions, and then subjucting it to a heat setting treatment.
USE OF "Lumirrorâ"
"Lumirrorâ"
has many applications as exemplified below:
(1)
High-voltage electric equipment
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(2)
Cables
(3)
Printed circuits
- Base
plates of flexible, printed circuits, tapes and cables.
(4)
Electrical Lamination
-
Lamination
of micas, nonwoven fabrics, glass fabrics, polyethylene,
aluminum foils, metallized materials, etc.
-
Adhesive tapes for electrical insulation.
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Mechanical
Properties
"Lumirrorâ" has high tensile
strength along with proper elongation and good edge-tearing
resistance making it suitable for use in electrical insulation.
Its mechanical properties as well as other properties are
well balanced both in the machine and transverse directions.
Electrical Properties
In addition to the inherent hight insulation quality of polyester
films, "Lumirrorâ" has the
excellent dielectric strenght of 8,000 volts for 1 mil film
(20°C,
68°F,
60Hz/sec., ASTM D-149-64), without virtually any insulating
defects.
Withstands Heat and Cold
The melting point of "Lumirrorâ"
is 262-263°C
(504-506°F).
Its applicable temperature range is from -70°C
to 150°C
(from-95°F
to 302°F),
and it can withstand the temperature as high as 180°C
(355°F)
for a relativelly short time, It does not contain any plasticizer
that very often degrades other films to an oozy state, therefore
it maintains its electrical insulating property for long.
It will remain flexible under a wide range of climatic conditions.
Dimensional Stability
"Lumirrorâ" shows a relatively
low thermo-shrinkage rate and good dimensional stability against
moisture.
Resistant to Chemicals "Lumirrorâ"
will not be affected by any kind of oil and most of chemicals
and solvents. It can well withstand, therefore, the vanish
impregnating and curing process of motors, transformers, etc.
However, it is not so resistant to alkali or hydrolysis at
temperature because of polyester film's inherent characteristics.
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