IPC-TM-650 EN 2022 试验方法--.pdf - 第134页
IPC-TM-650 Number Subject Date Revision Page 2 of 3 2.3.10 Flammability of Laminate 12/94 B [257 ± 3.6°F], then cooled in a desiccator for 4 hours mini¬ mum prior to testing. 5.2.3 Reserve sets of specimens may also be c…
IPC-TM-650
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Page 1 of 3
IPC-TM-650
TEST
METHODS
MANUAL
1
.0
Scope
This
test
method
is
designed
to
determine
the
degree
of
flame
resistance
of
metal-clad
or
unclad
laminate.
It
is
intended
for
use
on
laminate
of
thicknesses
0.51
mm
[0.020
in]
and
greater.
2
.0
Applicable
Documents
Method
2.3.6,
Etching,
Ammonium
Persulfate
Method
Method
2.3.7,
Etching,
Ferric
Chloride
Method
Method
2.3.
7.1,
Cupric
Chloride
Etching
Method
Method
2.3.
7.2,
Alkaline
Etching
UL-STD-94,
Flammability
3
.0
Test
Specimens
3.1
Size
Test
specimens
shall
be
127±
0.64
mm
[5.0
±
0.025
in]
in
length
and
12.7
±
0.51
mm
[0.5
±
0.020
in]
in
width
by
the
thickness
being
tested.
Edges
shall
be
smoothed
after
cutting;
any
radius
imparted
to
the
corners
shall
not
exceed
1
.27
mm
[0.05
in].
3.2
Quantity
and
Sampling
Specimens
may
be
taken
par¬
allel
to
either
grain
direction,
unless
otherwise
specified.
Five
specimens
shall
be
prepared
for
each
condition
required.
Reserve
sets
of
five
specimens
should
also
be
prepared
in
the
event
a
retest
is
necessary.
4
.0
Apparatus
or
Material
4.1
Test
Chamber
A
laboratory
hood,
totally
enclosed,
with
a
heat-resistance
glass
window
for
observing
the
test,
shall
be
used.
The
exhaust
fan
shall
be
turned
off
during
the
test,
but
may
be
turned
on
periodically
to
clear
out
the
fumes
between
tests.
4.2
Specimen
Holder
Clamping
device
adjustable
for
ver¬
tical
positioning
of
the
test
specimen
shall
be
provided
within
the
test
chamber
so
that
the
specimen
will
hang
with
its
length
in
a
vertical
position
approximately
coincident
with
the
central
vertical
axis
of
the
test
chamber.
4.3
Laboratory
burner
A
Bunsen
or
Tirrill
Burner
shall
be
used
having
a
tube
length
of
101
.6
mm
[4.0
in]
and
an
inside
diameter
of
9.4
mm
[0.370
in].
The
burner
shall
not
be
Number
2.3.10
Subject
Flammability
of
Laminate
Date
Revision
12/94
B
Originating
Task
Group
MIL-P-13949
Test
Methods
Task
Group
(7-1
1b)
equipped
with
end
attachments.
4.4
Gas
supply
The
gas
supply
shall
be
regulated
and
metered
for
uniform
flow.
The
standard
gas
shall
be
Technical
Grade
methane.
Natural
gas
or
other
fuel
gases
such
as
butane,
propane
and
acetylene
may
be
used,
provided
they
have
a
nominal
heat
content
of
1000
BTU
per
cubic
foot.
Technical
grade
methane
shall
be
used
for
referee
testing.
4.5
Timer
Stopwatch
or
other
suitable
timing
device
with
a
precision
of
0.5
seconds
minimum.
4.6
Desiccator
Desiccation
chamber
capable
of
maintain¬
ing
an
atmosphere
of
less
than
30%
RH
at
23℃
[73°F]-
4.7
Conditioning
oven
of
circulating
draft
type
capable
of
maintaining
125
±
2
℃
[257
±
3.6°F]-
4.8
Thin
steel
scale
or
template
for
gauging
flame
height.
4.9
Etching
system
capable
of
removing
metal-cladding
from
the
laminate.
4.10
Cutting
and
edge
smoothing
apparatus
such
as
shears,
diamond
blade
saw,
or
other
equipment,
and
sanding
or
routing
equipment
for
smoothing.
5
.0
Procedure
5.1
Specimen
Preparation
Metal-clad
laminates
shall
be
completely
etched
using
standard
industry
practices
(see
IPC-
TM-650,
Methods
2.3.7,
2.3.7.
1
,
or
2.
3.
7.
2).
Unclad
lami¬
nates
shall
be
tested
in
the
as-is
condition.
Specimens
shall
be
cut
to
size
and
the
edges
smoothed,
in
accordance
with
3.1.
5.2
Specimen
Conditioning
5.2.1
Specimen
sets
shall
be
conditioned
prior
to
testing
by
exposure
to
standard
laboratory
conditions
of
23
±
2
℃
[73
土
3.6°F]
and
relative
humidity
of
50
±
5%
for
24
hours
minimum.
5.2.2
If
specified,
a
second
set
of
specimens
shall
be
conditioned
for
24
±
2
hours
at
a
temperature
of
1
25
±
2
℃
IPC-TM-650
Number
Subject Date
Revision
Page 2 of 3
2.3.10
Flammability
of
Laminate
12/94
B
[257
±
3.6°F],
then
cooled
in
a
desiccator
for
4
hours
mini¬
mum
prior
to
testing.
5.2.3
Reserve
sets
of
specimens
may
also
be
conditioned
concurrently
for
failure
verification
purposes.
5.3
Preparation
for
Testing
5.3.1
Adjustment
of
Test
Flame
The
burner
is
ignited
and
adjusted
to
produce
a
blue
flame
19
mm
[0.75
in]
high.
The
correct
flame
is
obtained
by
adjusting
the
gas
supply
and
the
air
ports
of
the
burner
until
a
blue
flame
with
a
yellow-
tipped
outer
cone
19
mm
[0.75
in]
high
is
produced.
The
air
supply
is
increased
slightly
by
opening
the
air
ports
only
until
the
yel¬
low
tip
just
disappears
and
completely
blue
inner
and
outer
flame
cones
are
formed.
The
flame
is
remeasured
for
correct
height.
The
procedure
is
repeated
as
necessary
until
all
con¬
ditions
are
met.
The
burner
tube
is
vertical
during
adjustment
and
testing.
(See
6.2,
6.3,
and
6.4.)
5.3.2
Specimen
Mounting
Each
specimen
is
mounted
in
the
test
fixture
with
its
longitudinal
axis
vertical.
The
clamp
used
shall
cover
no
more
than
the
upper
6.4
mm
[0.25
in]
of
the
specimen.
The
vertical
position
of
the
test
fixture/
specimen
assembly
is
adjusted
so
that
the
lower
end
of
the
specimen
is
9.5
mm
[0.375
in]
above
the
top
of
the
burner
tube.
5.4
Measurement
5.4.1
The
test
flame
is
placed
centrally
under
the
lower
end
of
the
specimen
for
10
±
0.5
seconds.
The
burner
is
with¬
drawn
from
the
specimen.
If
active
combustion
ceases
prior
to
the
specimen
being
completely
consumed,
the
test
flame
is
to
be
immediately
placed
under
the
specimen
for
an
additional
1
0
±
0.5
seconds,
then
withdrawn
as
before.
5.4.2
Evaluation
and
Report
Steps
5.5.1
,
5.5.2,
and
5.5.3
shall
be
performed
for
each
test
condition.
5.5
Recording
Data
The
following
data
is
to
be
observed
and
recorded.
5.5.1
Duration
of
specimen
burning
to
the
nearest
second
after
the
first
test
flame
application
for
each
specimen.
5.5.2
Duration
of
specimen
burning
to
the
nearest
second
after
the
second
test
flame
application
for
each
specimen.
5.5.3
Duration
of
specimen
burning
plus
glowing
to
the
nearest
second
after
the
second
test
flame
application
for
each
specimen,
only
if
required
by
the
specification.
5.5.4
If
any
specimen
burns
up
to
the
holding
clamp
on
any
ignition.
5.6
Calculation
5.6.1
Calculate
the
total
specimen
burning
time
and
the
average
burning
time
based
on
ten
ignitions
per
set
of
five
specimens.
5.6.2
Calculation
of
the
glowing
time
for
each
specimen,
if
required
by
the
specification.
5.7
Report
The
material
shall
be
reported
as
out
of
compli¬
ance
for
one
or
more
of
the
following
test
results,
unless
oth¬
erwise
specified.
5.7.1
More
than
one
specimen
per
set
burns
up
to
the
hold¬
ing
clamp
on
any
ignition.
5.7.2
More
than
one
specimen
per
set
burns
for
a
period
of
time
longer
than
allowed
by
the
specification
for
a
single
specimen.
5.7.3
The
total
specimen
burning
time
or
the
average
speci¬
men
burning
time
as
applicable
exceeds
the
maximum
allowed
by
the
specification
and
is
beyond
the
tolerance
specified
in
5.5.4.
5.7.4
More
than
one
specimen
glows
for
a
period
of
time
greater
than
allowed
by
the
specification
(when
applicable).
5.8
Retest
If
only
one
specimen
per
set
fails
to
comply
with
the
requirements,
the
reserve
set
of
specimens
shall
be
tested.
In
the
case
of
total
or
average
specimen
burning
time,
the
reserve
set
shall
be
tested
only
if
these
calculated
values
exceed
the
specification
maximum
by
five
seconds
or
less.
All
specimens
from
the
reserve
set
shall
comply
with
the
require¬
ments.
6.0
Notes
6
J
Most
laminates
covered
by
this
test
method
do
not
drip
molten
or
flaming
material,
and
therefore
provisions
for
this
evalu¬
ation
have
not
been
described.
If
necessary,
refer
to
UL-STD-94.
6.2
The
inside
of
the
burner
barrel
should
be
cleaned
fre¬
quently.
Specimen
combustion
by-products
can
collect
around
and
inside
the
barrel
tip.
These
deposits
can
be
IPC-TM-650
Number
Subject Date
Revision
Page 3 of 3
2.3.10
Flammability
of
Laminate
12/94
B
flushed
out
during
burner
ignition
and
flame
adjustment
resulting
in
a
false
yellow
flame
tip.
Proper
flame
adjustment
becomes
very
difficult.
6.3
When
the
flame
is
correct
and
the
specimens
end
is
at
the
proper
height
above
the
burner
9.5
mm
[0.375
in],
the
inner
blue
come
of
the
flame
will
just
meet
the
end
of
the
specimen.
The
specimen
will
then
be
ignited
by
the
hottest
area
of
the
flame.
6.4
Accurate
centering
of
the
flame
under
the
specimen
is
essential
for
consistent
testing.
6.5
Desiccator
Conditions
The
Test
Methods
Task
Group
determined
that
a
great
majority
of
test
laboratories
are
unable
to
consistently
hold
the
Relative
Humidity
in
a
desiccator
to
less
than
20%.
Based
on
data
from
participating
company
lab
management,
the
lowest
practically
feasible
RH
for
use
with
the
affected
IPG
Test
Methods
is
30%
maximum.