FILM INSULATIONS
INSULATION
RATING
AWG
ADVANTAGES
CONSIDERATIONS
-
Excellent
abrasion
resistance
- Must be
stripped
before
-
Excellent
compatibility
with
soldering
Polyvinyl
Formal
Class
105
transformer
oils
-
Should
be
annealed
before
14 - 50
MW
15-C
-
Good
electrical
properties
application
of
varnish
-
Used
in Cryogenic
Applications
-
Excellent
electrical
properties
for
high
Class
155
-
Not
recommended
for
applica-
30 - 50
Q
coils
MW
79-C
tions
with
the
possibility
of
-
Easily
solderable
390°C/360°C
severe
thermal
overload
Polyurethane
-
Excellent
film
adhesion
&
flexibility
Class
180
24 - 50
-
Good
moisture
&
chemical
resistance
MW
82-C
-
Good
electrical
properties
-
Not
recommended
for
applica-
Class
155
10 - 46
-
Easily
solderable
430°C/390°C
tions
with
the
possiblity
of
MW
80-C
-
Excellent
film
adhesion
&
flexibility
severe
thermal
overload
-
Improved
chemical
&
mechanical
-
Nylon
topcoat
is
hygroscopic
Polyurethane-Nylon
resistance
from
nylon
topcoat
Class
180
25 - 46
-
Nylon
overcoat
provides
low
MW
83-C
coefficient
of
friction
-
Solderable
470°C
-
Low
abrasion
resistance
-
Excellent
thermal
properties
compared
to
Nylon
&
amide
-
Good
electrical
proper
ties
imide
topcoat
materials
Solderable
Polyester
Class
180
-
Good
compatibility
with
varnishes
&
-
Preheat
before
varnishing
is
14 - 50
MW
77-C
solvents
recommended
-
Improved
thermal
overload
-
Good
moisture
resistance
-
Nylon
topcoat
is
hygroscopic
-
Solderable
470°C
-
Preheat
before
varnishing
is
-
Excellent
thermal
properties
recommended
-
Good
electrical
properties
-
Good
compatibility
with
varnishes
&
Class
180
Solderable
Polyester
14-50
solvents
MW
78-C
Nylon
-
Improved
thermal
overload
-
Good
moisture
resistance
-
Nylon
overcoat
provides
low
coefficient
of
friction
- Must be
stripped
before
-
Excellent
flexibility
&
abrasion
soldering
resistance
-
Not
recommended
for
use
in
-
Excellent
thermal
overload
Class
200
Polyester(amide)(imide)
34 - 44
oil-filled
transformers
-
Excellent
dielectric
strength
MW
74-C
-
Preheat
before
varnishing
-
Excellent
moisture
resistance
-
Good
chemical
resistance
-
Excellent
flexibility
&
abrasion
- Must be
stripped
before
resistance
soldering
Polyester/Poly-amideimide
Class
200
-
Excellent
thermal
overload
-
Preheat
before
varnishing
8 - 33
Overcoat
MW
35-C
-
Excellent
dielectric
strength
-
Excellent
moisture
resistance
-
Good
chemical
resistance
- Must be
stripped
before
-
Excellent
flexibility
soldering
-
Excellent
thermal
overload
-
Excellent
radiation
resistance
- Must be
annealed
before
Class
240
10 - 30
-
Excellent
chemical
compatibility
varnishing
Polyimide
MW
16-C
High
dielectric
strength
-
Will
solvent
craze
-
Adequate
abrasion
resistance
-
-
Low
outgas
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