IPC-TM-650 EN 2022 试验方法.pdf - 第259页
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 averag…
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
P
age2of3
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
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
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
1.0
Scope
To
determine the release strength of the carrier
of thin copper foil in pounds per inch of width at ambient tem-
perature.
2.0
Applicable Documents
None
3.0
Test Specimen
Laminated
copper foil with carrier.
4.0
Apparatus
4.1
Force
gauge or testing machine capable of a rate of
50.8 ± 2.5 mm [2 ± 0.1 in] per minute.
5.0
Procedure
5.1 Preparation for Tests at Ambient Temperature
5.1.1
Specimens
for this test must be free from such
defects as delamination, surface wrinkles, surface measling,
surface blisters, and cracks.
5.1.2
Prepare
75 mm [3.0 in] wide peel strength specimen a
minimum of 75 mm [3.0 in] long.
5.1.2.1
Score
completely through the carrier a 25 mm [1.0
in] wide strip.
5.1.3
Peel
back the carrier on the 25 mm [1.0 in] strip
approximately 25 mm [1.0 in] so that the line of peel is per-
pendicular to the edge of the specimen.
5.2
Test Procedure
5.2.1
Clamp
each specimen on a horizontal surface with the
peeled metal strip projecting upward for 25 mm [1.0 in].
5.2.2
Grip
the end of the strip between jaws of the clamp.
5.2.3
The
jaws must cover the full width of the metal strip
and must be parallel to the line of peel.
5.2.4
Exert
the force in a vertical plane. The metal foil must
be pulled at a rate of 50 mm [2.0 in] per minute.
5.3
Evaluation
The
minimum load shall be observed and
converted to kg per mm or pounds per inch of width. If the full
width of the strip does not peel, the results shall be discarded
and another specimen tested.
6.0 Notes
None
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062-6135
IPC-TM-650
TEST
METHODS MANUAL
Number
2.4.8.4
Subject
Carrier
Release, Thin Copper
Date
1/90
Revision
—
Originating Task Group
N/A
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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