IPC-TM-650 EN 2022 试验方法--.pdf - 第247页

5.5.2 Apply sufficient force to the punch using the appara- tus in 4.6 to remove the section from the test specimen. 5.5.3 Use a permanent marke r or vibrating scribe to serial- ize each resulting piece. 5.6 Visual Exami…

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1 Scope
This test method specifies techniques for the
determination of machineability of a solder mask.
2 Applicable Documents
Qualification and Performance of Permanent
Solder Mask
Multipurpose One-Sided Test Pattern
3 Test Specimens
Six (6) IPC-B-25A boards coated with
solder mask on the top side. Three are to be tested
as-received and three are to be tested after solder float expo-
sure.
The IPC-A-25A-G-KIT artwork package provides the Gerber
information necessary for the fabrication of the standard IPC-
B-25A test board.
4 Apparatus and Reagents
4.1 Drill
4.1.1
Drill speed of 1500 ± 250 rpm
4.1.2
Drill bit size of 6.35 mm [0.25 in]
4.2 Router
4.2.1
Speed of 20,000 ± 5,000 rpm
4.2.2
Router bit to be standard for printed board fabrication
and operation at recommended speed. Bit must be sharp and
in good working order.
4.3 Band Saw
4.3.1
Speed of (442 ± 76) m/min [(1450 ± 250) ft/min]
4.3.2
Blade of 1.2 cm [0.5 in] width, 0.89 mm [0.035 in]
gauge, and 10-14 pitch
4.4 Punch
4.4.1
2.5 cm [1 in] square die
4.4.2
Clearance range between punch and die to be [0.001
to 0.003 in]
4.5 Permanent Marker and/or Vibrating Scribe
4.6 Hammer or Mechanical Punching Apparatus
5 Procedures
5.1 Preconditioning
5.1.1
Process three of the IPC-B-25A coupons per IPC-SM-
840, Resistance to Tin-Lead Solder - Solder Float
5.2 Drilling
5.2.1
Drill three holes in each coupon directly below the
label ‘‘B’’ on the test specimen.
5.3 Routing
5.3.1
Route a straight edge along the top side of each cou-
pon.
5.3.2
Use a permanent marker or vibrating scribe to serial-
ize each resulting piece.
5.4 Sawing
5.4.1
Make a single cut along the bottom edge of each cou-
pon removing the finger tab area.
5.4.2
Use a permanent marker or vibrating scribe to serial-
ize each resulting piece.
5.5 Punching
5.5.1
Place the punch over the fiducial above the comb pat-
tern labeled ‘‘F’’ on the test specimen.
1. www.ipc.org/onlinestore
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IPC-TM-650
TEST METHODS MANUAL
Number
2.4.7.1
Subject
Solder Mask - Determination of Machineability
Date
03/07
Revision
Originating Task Group
Solder Mask Performance Task Group (5-33b)
ASSOCIATION CONNECTING
ELECTRONICS INDUSTRIES
®
IPC-SM-840
IPC-A-25A-G-KIT1
Material
/n
this
Test
Methods
Manual
was
voluntarily
established
by
Technical
Committees
of
I
PC.
This
material
/s
advisory
only
and
"s
use
or
adaptation
，
s
entirely
voluntary.
IPC
disclaims
all
liability
of
any
kind
as
to
the
use,
application,
or
adaptation
of
this
material.
Users
are
also
wholly
responsible
for
protecting
themselves
against
all
claims
or
liabilities
for
patent
infringement.
Equipment
referenced
/s
for
the
convenience
of
the
user
and
does
not
imply
endorsement
by
IPC.
Page
1
of
2
5.5.2
Apply sufficient force to the punch using the appara-
tus in 4.6 to remove the section from the test specimen.
5.5.3
Use a permanent marker or vibrating scribe to serial-
ize each resulting piece.
5.6 Visual Examination
5.6.1
Visually examine each coupon and the extracted
pieces for evidence of tears or cracks of the solder mask.
6 Notes
6.1 Safety
Operator should be trained and familiar with the
hazards inherent to the chemicals being used and analyzed.
Proper personal safety equipment, such as safety glasses,
gloves and splash apron, and adequate ventilation shall be
used.
Number
2.4.7.1
Subject
Solder Mask - Determination of Machineability
Date
03/07
Revision
IPC-TM-650
Page
2
of
2
IPC-TM-650
The Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
Page 1 of 3
IPC-TM-650
TEST
METHODS
MANUAL
1
.0
Scope
This
test
method
is
designed
to
determine
the
peel
strength
of
metallic
cladding
when
tested
in
the
following
conditions,
“as
received,”
after
thermal
stress,
and
after
exposure
to
processing
chemicals;
and
to
evaluate
the
base
laminate
material
after
the
peel
strength
test
is
completed
for
degradation
due
to
the
conditioning.
2
.0
Applicable
Documents
Method
2.4.
8.1
,
Peel
Strength,
Metal
Foil
(Keyhole
Method
for
Thin
Laminates)
Method
5.8.3,
Peel
Strength
Test
Pattern
3
.0
Test
Specimens
3.1
Size
and
Configuration
Specimens
shall
be
50.8
mm
x
50.8
mm
[2.0
x
2.0
in]
by
the
thickness
of
the
laminate.
Cladding
test
strips
shall
be
as
specified
(see
5.1
.2).
3.2
Quantity
and
Sampling
At
least
2
specimens
per
clad
side
per
each
test
condition
(see
5.2)
shall
be
taken
at
random
from
the
laminate
lot.
They
may
be
taken
from
samples
used
for
other
QA
testing
or
inspection.
One
specimen
per
side
shall
be
used
for
crosswise
and
one
specimen
per
side
for
lengthwise
testing.
4
.0
Apparatus
or
Material
4.1
Tensile
Tester
A
tensile
strength
tester
equipped
with
a
load
cell,
capable
of
measuring
to
the
nearest
0.0045
kg
[0.01
lbs],
and
light
load
wire
or
chain
and
clamp
at
least
457
mm
[1
8.0
in]
long
(its
weight
is
included
in
the
load
cell
calcu¬
lation).
The
clamp
jaws
must
cover
the
entire
width
of
each
peel
strip.
Any
equipment
or
apparatus
having
the
described
accuracy,
precision,
and
reproducibility
may
be
used.
4.2
Solder
Pot
A
solder
bath
or
pot
capable
of
maintaining
solder
at
the
specified
temperature
when
measured
25.4
mm
[1.0
in]
below
the
surface.
Type
Sn60
or
Sn63
solder
shall
be
used.
4.3
Specimen
Hold-down
A
suitable
hold-down
clamping
system
equivalent
in
performance
as
that
defined
in
IPC-TM-
650,
Method
2.4.8.1.
Number
2.4.8
Subject
Peel
Strength
of
Metallic
Clad
Laminates
Date
12/94
Revision
C
Originating
Task
Group
MIL-P-13949
Test
Methods
Task
Group
(7-1
1b)
4.4
Chemicals
A
minimum
of
two
ounces
of
the
following
processing
solutions:
4.4.1
Organic
chemical
stripper,
such
as
Methylene
Chlo¬
ride,
or
equivalent
4.4.2
Sodium
Hydroxide
10
gr/liter
4.4.3
Boric
Acid
30
gr/liter
and
Sulfuric
Acid
1
0
gr/liter
444
Organic
degreaser,
such
as
isopropyl
alcohol,
or
equivalent.
4.5
Hot
fluid
bath,
capable
of
being
maintained
at
the
speci¬
fied
temperature,
when
measured
25.4
mm
[1
.0
in]
below
the
surface.
4.5.1
Dow
Silicone
Fluid
No.
704,
or
equivalent.
4.6
Dow
Silicone
Grease,
Compound
4,
or
equivalent.
4.7
Data
Collection
For
qualification
testing,
a
recording
system
capable
of
permanent
data
retention
must
be
incorpo¬
rated
into
the
test
apparatus.
4.8
Etching
system
capable
of
complete
removal
of
metallic
cladding.
4.9
Measuring
device
capable
of
measuring
from
0.000
to
12.7
mm
[0.5
in]
to
within
土
0.0025
mm
[0.0001
in].
4.10
Etch
Resist
Materials
or
Systems
4.10.1
Platers
tape,
or
equivalent,
to
act
as
etch
resist
for
strip
formation
of
the
specified
widths
(see
5.2.1
.1
,
5.2.2.
1
,
and
5.2.
3.1).
4.10.2
Photoresist
system
(printing,
developing,
and
stripping).
5
.0
Procedure
5.1
Specimen
Preparation