IPC-TM-650 EN 2022 试验方法.pdf - 第99页
5.3.2.2.2.1 Calculate the overall nominal thickness by add- ing to the base nominal thickness the total thickness of the metallic cladding. Thickness of metallic cladding shall be based on .035 mm [0.0014 in] per 45.7 g …
1.0
Scope
This
test method is designed to determine the
thickness of unclad or metallic clad laminate, with or without
the cladding, using mechanical measurements.
2.0
Applicable Documents
IPC-TM-650
Method
2.3.6, Etching, Ammonium Persulfate
Method 2.3.7, Etching, Ferric Chloride
Method 2.3.7.1, Cupric Chloride Etching
Method 2.3.7.2, Alkaline Etching
3.0
Test Specimens
Consult
with the applicable specifica-
tion for size or configuration, quantity, and location taken from
the laminate.
3.1
Size
Test
specimens may be strips cut from the lami-
nate and shall be 12.7 mm [0.5 in] wide, minimum. Sheets or
cut-to-size panels may be used as specimens.
3.2
Sampling
Unless
otherwise specified, two specimens
shall be taken from locations within the sampling that repre-
sent the centermost area and the edges, but no closer than
25.4 mm [1.0 in] from the edge, of the as-manufactured
sheet.
4.0
Apparatus or Material
4.1
Micrometer
with a minimum throat depth of 25.4 mm
[1.0 in] and with accuracy of 0.0025 mm [0.0001 in], or
equivalent.
4.2
Etching
system capable of complete removal of metallic
cladding. IPC Test Methods 2.3.6, 2.3.7, 2.3.7.1, or 2.3.7.2
shall be used for referee testing.
5.0
Procedure
5.1 Specimen Preparation
5.1.1 Method A, Metallic Cladding Removed
This
method
is used to determine base laminate thickness by
direct measurement of the laminate without cladding. It shall
be used for qualification or referee testing.
5.1.1.1
Completely
etch the test specimen in accordance
with accepted industry practices.
5.1.2
Method B, As Manufactured
This
method is used
to determine overall thickness of unclad or metallic clad lami-
nates. It is used to determine base thickness of metallic clad
laminates when evaluated in accordance with 5.3.2.2.2.
Unless otherwise specified, it shall be used for product accep-
tance inspection.
5.1.2.1
The
specimens shall be tested in the
as-manufactured condition.
5.2
Measurements
Using
the micrometer, determine the
thickness of the specimen. Unless otherwise specified, speci-
mens that are sheets or panels shall be measured at least
25.4 mm [1.0 in] from the edge at all four (4) corners.
5.3
Evaluation
5.3.1 Data Recording
For
purposes including qualification
or referee testing, product evaluation, statistical analysis, etc.,
each thickness measurement shall be recorded, unless other-
wise specified.
5.3.2
Compliance to Specification
5.3.2.1 Unclad laminates or metallic clad laminates with
overall nominal thickness
Measurements
taken after
specimen preparation per 5.1.2 shall be compared with the
applicable specification for compliance to the required toler-
ances.
5.3.2.2
Metallic Clad Laminates with Base Nominal
Thickness
5.3.2.2.1 Compliance to Specification Using Method A
Specimen Preparation
Measurements
taken after speci-
men preparation per 5.1.1 shall be compared with the appli-
cable specification for compliance to the required tolerances.
5.3.2.2.2
Compliance to Specification Using Method B
Specimen Preparation
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.2.18
Subject
Determination
of Thickness of Laminates
by Mechanical Measurement
Date
12/94
Revision
Originating Task Group
MIL-P-13949 Test Methods Task Group (7-11b)
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.
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5.3.2.2.2.1
Calculate
the overall nominal thickness by add-
ing to the base nominal thickness the total thickness of the
metallic cladding. Thickness of metallic cladding shall be
based on .035 mm [0.0014 in] per 45.7 g [1.0 oz], or as sup-
plied by the foil supplier.
5.3.2.2.2.2 Calculate the minimum and maximum limits by
subtracting and adding the required tolerance from the over-
all nominal thickness.
5.3.2.2.2.3 Measurements
taken after specimen prepara-
tion per 5.1.2 shall be compared with the minimum and maxi-
mum limits as determined in 5.3.2.2.2.
5.4
Report
Unless
otherwise specified, report the average,
minimum and maximum readings, and compliance with
requirements, if applicable.
6.0 Notes
6.1
Use
of hand or manual micrometers should be carefully
administered. Pressure, anvil shape, and other features of the
micrometer and its use must follow accepted industry
practices, if not defined in the applicable specification.
IPC-TM-650
Number
2.2.18
Subject
Determination
of Thickness of Laminates
by Mechanical Measurement
Date
12/94
Revision
P
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1.0
Scope
This
test method is designed to determine the
minimum and maximum thickness of the base material of
metallic clad laminates by microsectioning and optical mea-
surement.
2.0
Applicable Documents
IPC-TM-650
Method
2.1.1, Microsectioning
IPC-TM-650
Method
2.2.18, Determination of Thickness of
Laminates, by Mechanical Measurement
3.0
Test Specimens
3.1 Size
Unless
otherwise specified, a specimen measuring
25.4 X 12.7 mm [1.0 X 0.5 in] shall be taken from the laminate
sample.
3.2
Quantity and Sampling
Unless
otherwise specified,
two samples shall be taken from the lot that represent the
centermost area and the edges, but no closer than 25.4 mm
[1.0 in] from the edge, of the as- manufactured sheet.
4.0
Apparatus or Material
4.1
Any
optical inspection measuring device with a capabil-
ity of 100X and 200X with an accuracy to 0.0025 mm [0.0001 in].
4.2
A
microsectioning system capable of preparing speci-
men mounts that can be used for this procedure.
5.0
Procedure
5.1 Preparation of Specimens
Each
specimen to be
measured shall be microsectioned in accordance with IPC-
TM-650, Method 2.1.1. The long dimension of the specimen
shall be in the plane of examination. Specimens may be
ganged in accordance with the sampling procedure.
5.2
Evaluation
Examine
the entire length of the specimen.
Determine and record the minimum and maximum thickness
of each specimen to the nearest 0.0025 mm [0.0001 in] using
100X magnification and in accordance with Figures 1 or 2, in
accordance with the applicable specification. Unless other-
wise specified, Figure 2 shall be used. Any referee measure-
ments shall be made at 200X magnifications.
5.3
Report
Report
the minimum and maximum readings
found from each specimen inspected, and whether the Paral-
lel (Figure 1) or Radius (Figure 2) Method was used.
6.0
Notes
Cross-sectional
thickness relates to the effective
electrical insulation thickness and will usually be less than that
found by mechanical means (see IPC-TM-650, method
2.2.18). For determination of the laminate’s contribution to
overall board thickness, the mechanical approach is preferred
(when measuring thin cores for multilayer applications).
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.2.18.1
Subject
Determination
of Thickness of Metallic Clad
Laminates, Cross-sectional
Date
12/94
Revision
Originating Task Group
MIL-P-13949 Test Methods Task Group (7-11b)
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.
P
age1of1
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