IPC-TM-650 EN 2022 试验方法.pdf - 第258页
Note: Peel values can be affected by the adhesive used to bond the specimen to the rigid substrate. It is imperative that the best adhesive be found for the type of materials being bonded to least affect the true peel st…
1.0
Scope
This
test is designed to determine the peel
strength of the metal cladding to the base laminate while
exposed to elevated temperature by means of heated air
chamber; and to evaluate the base laminate material after the
peel strength test is completed for degradation due to the
conditioning.
2.0
Applicable Documents
IPC-TM-650
Method
2.4.8.1, Peel Strength, Keyhole
Method 5.8.3, Peel Strength Test Pattern
3.0
Test Specimens
3.1 Size and Configuration
Specimen
size shall be 50.8 x
50.8 mm [2 x 2 in] by the thickness of the laminate. Cladding
test strips shall be as specified (see 5.1.2).
3.2
Quantity and Sampling
Unless
otherwise specified,
specimens shall be one lengthwise for each clad side and one
crosswise for each clad side. The outside 25.4 mm [1 in] bor-
der of the parent sheet or panel shall be excluded.
4.0
Apparatus or Material
4.1 Tensile Tester
A
tensile strength tester equipped with
a load cell, capable of measuring to the nearest 0.0045kg
[0.01 lbs.] and a light load wire or chain and clamp at least
457 mm [18 in] long (its weight is included in the load cell cal-
culation). The clamp jaws must cover the entire conductor
width of each peel strip tab. Any equipment or apparatus
having the described accuracy, precision, and reproducibility
may be used.
4.2
Thermal Chamber
An
enclosure of the specimen loca-
tion of the tester, capable of maintaining the test temperatures
as specified, to within 3°C [5.4°F].
4.3
Specimen Hold-down
A
suitable hold-down clamping
system equivalent in performance to that defined in IPC-TM-
650, Method 2.4.8.1.
4.4
Oven
Circulating
air oven capable of maintaining 125 ±
2°C [257 ± 3.6°F].
4.5
Timer
Timing
device capable of timing to within 1
second.
4.6
Measuring
device capable of measuring from 0.0000 to
12.7 mm [0.0000 to 0.50 in] to within 0.0127 mm [0.0005 in].
4.7 Etching
system capable of complete removal of metal
cladding.
4.8
Etch Resist Materials or Systems
4.8.1
Printer’s
tape, or equivalent, of the specified width
(see 5.1.4) to act as etch resist for strip formation.
4.8.2
Photo
resist system (printing, developing, and strip-
ping).
5.0
Procedure
5.1 Specimen Preparation
5.1.1
Cut
the specimens from the laminate sample. Speci-
mens shall be taken no closer than 2.54 mm [1.0 in] from the
edge of the laminate sheet.
5.1.2
Specimens
shall be prepared with suitable etch resist
material so that four strips of 3.18 mm [0.125 in] width are
etched, and then cleaned and processed using standard
industry practices and equipment. For qualification and ref-
eree testing, the specimens shall be photo-imaged in accor-
dance with Method 5.8.3 of IPC-TM-650, except that tab
ends are optional.
Specimens shall be etched so that the test strips on one
specimen are in one direction per Figure 2. Double clad lami-
nate shall have each side tested using separate specimens.
The opposite side cladding shall be either fully removed or left
fully clad. Separate samples for both the warp and fill direc-
tions are required for each side. For referee testing, the clad-
ding on the opposite side shall not be removed.
5.1.3
Thin
specimens may be provided with support by
bonding them to a rigid substrate base, or may be tested with
the aid of the keyhole fixture (see Figure 1). For referee testing
of single sided laminates less than 0.51 mm [0.020 in], the
specimens shall be bonded to a rigid substrate or laminate.
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.8.3
Subject
Peel
Strength of Metallic Clad Laminate at Elevated
Temperature (Hot Air Method)
Date
12/94
Revision
A
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
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Note:
Peel values can be affected by the adhesive used to
bond the specimen to the rigid substrate. It is imperative that
the best adhesive be found for the type of materials being
bonded to least affect the true peel strength value.
5.1.4
Peel
the test strip back approximately 12.7 mm [0.5
in] from the tab end (if present).
5.1.5
Unless
otherwise specified, specimens shall be pre-
conditioned by baking at 125°C [257°F] for 4 ± 0.5 hours. This
preconditioning is required regardless of elevated test tem-
perature requirements in the applicable specification.
5.2
Measurement
5.2.1 Peel Strength Determination
5.2.1.1
Preheat
the test chamber to the specified tempera-
ture.
5.2.1.2 Place
the specimen inside the test chamber, close
the door and allow the specimen to remain in the heated
chamber for 60 + 6, –0 minutes before performing the peel
test at the applicable elevated temperature.
5.2.1.3 After
attaching the clamp to each peel strip, allow
the specimen to stabilize at the elevated temperature for 2.5
minutes for 0.5 mm [0.020 in] thick material or less, and 5
minutes for material thicker than 0.5 mm [0.020 in].
5.2.1.4
Start
tester and apply force in the vertical direction
at 50.8 mm [2 in] per minute until peel is completed or test
strip breaks or tears (see 6.1).
5.2.1.5
Observe
and record the minimum load as defined
by Figure 2. Measure and record the actual width of the metal
strip.
5.2.1.6
If
the full width of the test strip does not peel, the
result may be discarded and another strip tested.
5.2.1.7
Perform
the procedure as per 5.2.2 through 5.2.4
on a minimum of 2 strips per side per specimen. Any unusual
event or irregularity in the data shall be cause to void the
strip’s results and repeat the sequence on a different strip.
5.2.2
Determination of Degradation
Examine
the speci-
mens using normal or corrected 20/20 vision. Record the
presence of any base laminate degradation, including loss of
surface resin, discoloration, resin softening, delamination, blis-
tering, propagation of imperfections, measling, crazing, or
voids.
5.3
Calculation and Report
5.3.1
Calculate
peel strength in pounds per inch width using
the formula:
lbs/in =
L
M
W
S
where:
L
M
=
Minimum load
W
S
=
Measured width of peel strip
5.3.2
Record
and report each individual peel strength value.
Average the individual peel strength values for each side and
each grain direction of the laminate sampling. For example, if
the sampling plan called for one specimen per side and per
grain direction, there will be at least two values to be averaged
from four different specimens.
5.3.3
Report
any presence of laminate degradation as
observed in 5.2.1.3.
6.0 Notes
6.1
Test
strip breaks may be caused by either superior bond
Figure
1
IPC-TM-650
Number
2.4.8.3
Subject
Peel
Strength of Metallic Clad Laminate at Elevated
Temperature (Hot Air Method)
Date
12/94
Revision
A
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or
brittle foil. Where superior bond is shown (value at break is
above specification), the value at break may be used instead
of the minimum load. The reported average shall indicate that
the value is greater than average.
6.2
For
copper foil less than 1 oz/ft
2
,
copper plating or sol-
der coating may be added to avoid breaks and tears.
IPC-I-002102
Figure
2 Multiple Failure Modes
Peel Distance
▼
▼
Load
High Peel Strength
Failure Mode
Low Peel Strength
Failure Mode
Minimum
Average
Load
IPC-TM-650
Number
2.4.8.3
Subject
Peel
Strength of Metallic Clad Laminate at Elevated
Temperature (Hot Air Method)
Date
12/94
Revision
A
P
age3of3
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