IPC-TM-650 EN 2022 试验方法--.pdf - 第121页
IPC-TM-650 Number Subject Date Revision Page 2 of 4 2.3.4.2 Chemical Resistance of Laminates, Prepreg, and Coated Foil Products, by Solvent Exposure 12/94 A and of a thickness when cured not greater than 0.13 mm [0.005 i…
IPC-TM-650
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Page 1 of 4
IPC-TM-650
TEST
METHODS
MANUAL
1
.0
Scope
This
method
is
designed
to
evaluate
the
resis¬
tance
of
dielectric
materials
to
organic
chemicals
representa¬
tive
of
those
used
in
printed
board
fabrication
and
assembly.
It
is
intended
to
provide
a
distinction
between
materials
of
varying
chemical
resistance
and,
when
applicable,
an
indica¬
tion
of
the
degree
of
cure.
2
.0
Applicable
Documents
Method
2.2.18,
Determination
of
Thickness
of
Laminates
by
Mechanical
Measurement
Weast,
R.C.,
ORC
Handbook
of
Chemistry
and
Physics,
65th
Edition,
E-37,
1984
3
.0
Test
Specimens
3.1
Number
Unless
otherwise
specified,
three
specimens
shall
be
used.
3.2
Size
Unless
otherwise
specified,
specimen
shall
be
50.8
x
50.8
mm
±
0.5
mm
[2.0
x
2.0
±
0.02
in]
by
the
thick¬
ness
of
the
material
(see
5.1
,
Preparation).
Edges
shall
be
smooth,
whether
by
the
cutting
procedure,
or
by
sanding,
or
other
means.
3.3
Location
Specimen
may
be
cut
from
anywhere
in
the
sheet
of
material,
except
no
specimens
shall
be
taken
closer
than
25.4
mm
[1.0
in]
from
any
edge
as
laminated.
4
.0
Apparatus
or
Material
4.1
Analytical
balance
with
a
draft
shield
and
.001
gram
or
better
resolution.
4.2
Air
circulating
oven,
capable
of
1
05
±
2
℃
[221
±
3.6°F].
4.3
Desiccator
capable
of
maintaining
an
atmosphere
of
less
than
30%
relative
humidity
at
23℃
[73°F].
See
6.2.5
4.4
Cutting
apparatus
such
as
diamond
saw,
shear
paper
cutter
or
router.
4.5
Edge
smoothing
apparatus
such
as
400
grit
or
finer
sandpaper.
Number
2.3.4.2
Subject
Chemical
Resistance
of
Laminates,
Prepreg,
and
Coated
Foil
Products,
by
Solvent
Exposure
Date
Revision
12/94
A
Originating
Task
Group
MIL-P-13949
Test
Methods
Task
Group
(7-1
1b)
4.6
One
liter
battery
jar,
with
cover.
4.7
Metal
tongs
or
forceps.
4.8
Metal
rack
(to
support
specimens
vertically).
4.9
Metal
support
(e.g.,
mounting
clip
used
for
microsec¬
tioning).
4.10
Laminating
press
capable
of
the
specified
temperature
and
pressure.
4.1
1
Timer:
1
hour
with
1
second
resolution.
4.12
Timer:
60
seconds,
1
second
resolution.
4.13
Solvent:
Methylene
Chloride,
Reagent
Grade
or
HPLC
Grade.
MC
recovered
by
distillation
back
to
reagent
grade
may
be
used.
HPLC
Grade
shall
be
used
for
referee
pur¬
poses.
4.14
Prepreg
(for
single
sided
laminate
and
coated
foil
test
only).
4.15
Copper
foil,
1
oz./ft2
treated
(for
prepreg
tests
only).
4.16
Ventilation
hood
4.17
Micrometer,
capable
of
measuring
to
within
0.025
mm
[0.001
in]
4.18
Water
bath
at
23
±
0.5℃
[73
±
0.9°F]-
4.19
Thermometer
capable
of
measuring
to
within
0.1
resolution.
4.20
Etching
system
capable
of
metallic
cladding
removal.
5
.0
Procedure
5.1
Sample
Preparation
5.1.1
Single-sided
Laminate
Single-sided
laminate
less
than
0.5
mm
[0.020
in]
shall
be
laminated
together
with
the
clad
surfaces
facing
out.
Two
plies
minimum
of
prepreg
shall
be
used.
The
prepreg
shall
be
of
the
same
basic
resin
type
IPC-TM-650
Number
Subject Date
Revision
Page 2 of 4
2.3.4.2
Chemical
Resistance
of
Laminates,
Prepreg,
and
Coated
Foil
Products,
by
Solvent
Exposure
12/94
A
and
of
a
thickness
when
cured
not
greater
than
0.13
mm
[0.005
in]
total,
using
the
prepreg
manufacturer's
recom¬
mended
press
cycle.
Laminate
over
0.5
mm
[0.020
in]
shall
be
treated
like
double
clad
laminate
without
lamination.
5.1.2
Resin-coated
Foil
Resin-coated
foil
samples
shall
be
laminated
together
using
at
least
two
plies
of
prepreg
between
the
coated
sides
of
the
foil.
The
prepreg
shall
be
of
the
same
basic
resin
type
and
of
a
thickness
when
cured
not
greater
than
0.127
mm
[0.005
in]
total,
using
a
press
cycle
and
any
subsequent
post
cure
which
meets
the
manufactur¬
er^
recommendations
for
both
the
coated
foil
and
prepreg.
(See
6.2.1.
1)
For
qualification
and
referee
tests,
a
0.50
±
0.10
mm
[0.02
in]
composite
core
is
to
be
built.
5.1.3
Laminate
with
Coated
Foil
Surfaces
Single-sided
laminate
shall
be
tested
after
lamination
as
in
5.1
.1
.
Double¬
sided
laminate
with
coated
foil
on
one
side
shall
have
the
foil
etched
from
the
uncoated
side
and
shall
subsequently
be
laminated
as
5.1.1.
Double-sided
laminate
with
coated
foil
on
both
sides
shall
be
tested
as
is.
5.1.4
Prepreg
Prepreg
shall
be
laminated
to
a
thickness
of
0.50
±
0.10
mm
[0.020
in]
using
treated
copper
foil
on
both
sides
and
following
the
prepreg
manufacturer's
recommended
press
and
post
cure
cycle.
(See
6.2.1
.1)
For
prepreg
less
than
0.13
mm
[0.005
in]
thick
when
cured,
at
least
two
plies
shall
be
bonded
to
either
side
of
an
etched
laminate
of
a
thickness
such
that
the
pressed
sample
satisfies
the
required
thickness.
5.1.5
Double-sided
Laminate
Double-sided
laminate
shall
be
submitted
for
testing
as
is.
5.2
Specimen
Preparation
5.2.1
Etching
Samples,
as
specified
in
3.0,
shall
be
etched
in
accordance
with
standard
industry
practices.
For
referee
purposes,
2.3.6,
2.3.7,
2.3.7.
1
,
or
2.3.7.2
shall
be
used.
5.2.2
Cut
the
specimens
to
size
per
3.2.
Cutting
shall
be
performed
using
apparatus
and
in
such
a
manner
that
pre¬
vents
edge
damage.
Edge
smoothing
is
recommended
to
prevent
excessive
absorption.
5.2.3
Markings
Each
specimen
shall
be
identified
by
mark¬
ing
with
a
lead
pencil
or
equivalent
technique
which
is
not
removed
by
the
solvent
and
which
doesn't
affect
the
results.
5.3
Preconditioning
5.3.1
Measure
and
record
nominal
thickness
of
the
test
specimen
using
IPC-TM-650,
Method
2.2.18.
5.3.2
Place
the
etched
specimens
vertically
in
the
metal
rack
and
dry
the
specimens
in
the
oven
for
60
±
5
minutes
at
105℃
[221
°F].
Air
flow
around
each
specimen
must
be
assured.
5.3.3
Remove
the
specimens
from
the
oven
and
immedi¬
ately
place
in
the
desiccator
to
cool
for
60
±
30
minutes.
5.4
Test
Condition
The
test
shall
be
performed
at
stan¬
dard
laboratory
conditions:
23
±
2
℃
[73
±
0.9°F]
and
50
±
5%
R.H.
5.5
Measurement
5.5.1
Fill
the
battery
jar
with
750
ml
of
solvent
and
maintain
the
solvent
temperature
at
23
±
0.5℃
[73
土
0.9°]
using
the
water
bath.
5.5.2
Remove
the
specimens
individually
from
the
desicca¬
tor
and
weigh
to
the
nearest
milligram
on
the
analytical
bal¬
ance.
Samples
must
be
weighed
within
60
seconds
of
removal
from
the
desiccator.
Record
these
weights
as
.
5.5.3
Place
the
rack
into
the
beaker
of
solvent,
start
the
60
minute
timer
and
using
tongs
place
the
specimens
in
the
rack
at
suitable
intervals
(recommend
approximately
2
minutes).
Insure
that
the
specimens
are
completely
immersed.
5.5.4
Place
the
metal
clip
on
the
balance
and
tare
it
out.
5.5.5
After
10
minutes
+15,
-0
seconds,
using
the
tongs
remove
the
first
specimen
from
the
solvent
and
start
the
60
second
timer.
5.5.6
Slowly
wag
the
specimen
in
the
air.
As
soon
as
the
specimen
is
free
of
surface
wetness,
but
no
longer
than
30
seconds,
place
the
specimen
on
the
balance
supporting
it
on
the
metal
clip
such
that
both
surfaces
of
the
specimen
are
exposed
(placing
the
specimen
flat
on
the
balance
pan
is
not
permitted
since
evaporation
from
the
side
next
to
the
pan
will
be
reduced.)
IPC-TM-650
Number
Subject Date
Revision
Page 3 of 4
2.3.4.2
Chemical
Resistance
of
Laminates,
Prepreg,
and
Coated
Foil
Products,
by
Solvent
Exposure
12/94
A
5.5.7
After
60
+5,-0
seconds
from
the
time
of
removal
from
the
solution,
note
the
weight
of
the
specimen
and
record
it
as
W2.
5.5.8
Repeat
5.5.5
-
5.5.7
for
the
remaining
specimens
insuring
the
immersion
time
of
each
specimen
is
kept
within
the
tolerance.
5.5.9
A
fresh
batch
of
solvent
shall
be
used
for
no
more
than
1
8
specimens
or
for
a
period
of
time
no
longer
than
8
hours.
5.6
Evaluation
5.6.1
Weight
Gain
5.6.1
.1
Subtract
the
dry
weight
of
each
specimen,
W
〕
,
from
the
final
weight,
W2
of
each
specimen
after
immersion.
Record
the
weight
gain
in
mg.
5.6.1.
2
Calculate
the
average
weight
gain
in
mg.
5.6.2
Appearance
Examine
the
specimens
using
20/20
vision
for
any
changes
to
the
appearance
of
the
material,
such
as
hazing,
whitening
or
swelling.
5.7
Report
5.7.1
Report
the
average
weight
gain
in
milligrams
for
the
material
tested.
5.7.2
Report
the
measured
specimen
thickness.
5.7.3
Report
actual
test
conditions
for
temperature
and
humidity
and
the
solvent
temperature.
5.7.4
Report
any
anomalies
in
the
test
or
any
variations
from
the
specified
procedures
or
tolerances.
5.7.5
Report
any
changes
in
the
visual
quality
of
the
speci¬
mens
as
determined
in
5.6.2.
6.0
Notes
6.1
Safety
Considerations
See
the
MSDS
sheet
for
the
solvent
used
before
running
this
test.
6.1.1
During
test,
the
beaker
with
the
test
solvent
should
be
covered
or
under
a
ventilation
hood.
6.1.2
Dispose
of
the
spent
solvent
in
accordance
with
local
regulations.
6.2
Factors
Affecting
Tests
6.2.1
Sample
6.2.1.
1
Same
Sample
The
results
obtained
on
the
same
sheet
of
material
may
be
significantly
affected
by
the
degree
of
cure
of
the
material
and
the
thermal
history
of
the
sample.
6.2.1.
2
Variation
Due
to
Thickness
of
Sample
There
is
a
very
small
difference
due
to
sample
thickness.
This
is
under
10%
on
typical
epoxy
materials
for
0.2
mm
[0.008
in]
to
1.5
mm
[0.060
in]
and
under
5%
on
more
chemical
resistant
material
from
0.13
mm
[0.005
in]
to
1.5
mm
[0.060
in].
6.2.2
Accuracy
Since
there
are
no
standards
for
this
type
of
test,
the
accuracy
of
the
method
cannot
be
established.
6.2.3
Precision
the
reproducibility
of
this
test
depends
on
the
degree
of
control
over
the
controlled
variables
and
some
other
variables
such
as
atmospheric
pressure,
which
are
gen¬
erally
not
controlled
in
industrial
laboratories.
Precision
between
laboratories
with
20%
to
50%
RH
was
10%
at
the
90
mg
level
and
16%
at
the
25
mg
level.
6.2.4
Desiccants
Desiccants
capable
of
0.002
mg
mois¬
ture
levels
include
P205>
Mg
(C1
04)
2
，
anhydrous
BaO
and
fused
KOH.
Some
other
desiccants
such
as
CaCI2
result
in
considerably
higher
moisture
levels
and
may
not
be
used
in
this
test.
(See
Weast
R.C.,
ORC
Handbook
of
Chemistry
and
Physics,
65th
edition,
E-37,
1
984.)
6.2.5
Humidity
Considerations
6.2.5.1
Effect
of
Humidity
Higher
humidity
will
produce
higher
solvent
pickup
due
to
retarded
solvent
evaporation.
6.2.5.2
Control
of
Humidity
Control
of
the
critical
environ¬
ment
can
be
obtained
in
uncontrolled
laboratories
using
an
enclosed
balance
with
a
saturated
salt
solution
of
Mg(No3)2,
6H
2
。
(for
50%
RH).
All
significant
openings
in
the
enclosure
are
sealed
with
tape
and
an
inner
door
is
fabricated
with
a
small
opening
for
sample
entry
and
exit.
A
shallow
pan
is
fabricated
to
occupy
most
of
the
balance
floor
without
contacting
the
weighing