IPC-TM-650 EN 2022 试验方法.pdf - 第254页

1.0 Scope The purpose of this test is to determine the peel strength of metal cladding to the base laminate while at elevated temperature; and to evaluate the base laminate material after the peel strength test is comple…

5.4

Evaluation

5.4.1

Calculate

the peel strength per mm of width by mea-

suring the strip width in mm, using the following formula:

1mm

measured

strip width in mm

x observed pull force =

peel strength/mm width

Notes

6.1

Peel

strength is usually the minimum peel strength

observed.

IPC-2-4-8-1-3

Figure

3 Chain to Hemostat Adapter

IPC-TM-650

Number

2.4.8.1

Subject

Peel

Strength, Metal Foil (Keyhole Method For Thin Laminates)

Date

1/86

Revision

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1.0

Scope

The

purpose of this test is to determine the peel

strength of metal cladding to the base laminate while at

elevated temperature; and to evaluate the base laminate

material after the peel strength test is completed for degrada-

tion due to the conditioning.

2.0

Applicable Documents

IPC-TM-650 Test Methods Manual

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

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

tensile strength tester equipped with

a load cell, capable of measuring to the nearest 0.0045 kg

[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 width of each

peel strip tab. Any equipment or apparatus having the

described accuracy, precision, and reproducibility may be

used.

4.2

Hot Fluid Bath

fluid bath or pot capable of maintain-

ing the specified fluid at the specified temperature when mea-

sured 2.54 mm [1.0 in] below the surface.

4.2.1

Dow

Silicone Fluid No. 704, or equivalent.

4.3

Specimen Hold-down

suitable hold-down clamping

system equivalent in performance as that defined in IPC-TM-

650, Method 2.4.8.1.

4.4

Data Collection

For

qualification testing, a recording

system capable of permanent data retention incorporated into

the test apparatus.

4.5 Measuring

device capable of measuring from 0.000 to

12.7 mm [0.500 in] to within ± 0.0025 mm [0.0001 in].

4.6

Etch Resist Materials or Systems

4.6.1

Plater’s

tape, or equivalent, to act as etch resist for

strip formation of the specified widths (see 3.3 and 3.4).

4.6.2

Photoresist

system (printing, developing, and strip-

ping).

4.7

Etching

system capable of complete removal of metallic

cladding.

4.8

Circulating

air oven capable of maintaining 125 ± 2°C

[257 ± 3.6°F].

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 as manufactured.

5.1.2

Specimens

shall be prepared with at least four resist

strips of 3.18 mm [0.125 in] width and then etched, cleaned

and processed using standard industry practices and equip-

ment. For qualification and referee testing the specimen shall

be photoimaged in accordance with the artwork shown in

Method 5.8.3 of IPC-TM-650 and reproduced here as Figure

1, except that tab ends are optional. Specimens shall be

etched so that the conductor strips on one specimen are in

one direction per Figure 1. Double clad laminate shall have

each side tested using separate specimens. The opposite

side cladding shall be either fully removed or left fully clad.

Separate specimens for both the warp and fill directions are

required for each side. For referee testing the cladding on the

opposite side shall remain.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8.2

Subject

Peel

Strength of Metallic Clad Laminates at

Elevated Temperature (Hot Fluid Method)

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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5.1.3

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 2). For referee testing

of laminates less than 0.51 mm [0.020 in], the specimens shall

be bonded to a rigid substrate or laminate.

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 influence the true peel strength value.

5.1.4 Peel

the test strip back no more than 12.7 mm [0.5 in]

at the tab end.

5.1.5

For

qualification or referee testing purposes, speci-

mens shall be preconditioned by baking at 125 ± 2°C [257 ±

3.6°F] for a minimum of two hours. This preconditioning is in

addition to elevated test temperature requirements on the

appropriate material specification.

5.1.6

Heat

fluid bath to specified temperature and stabilize

at least 5 minutes. Measure temperature approximately 25.4

mm [1.0 in] below surface.

5.2

Measurement

5.2.1 Peel Strength Determination

5.2.1.1

Clamp

the tab end (if present) of each individual test

strip and place specimen and clamp into fluid bath immersing

specimen horizontally approximately 25.4 mm [1.0 in] below

the surface.

5.2.1.2

Fasten

specimen with hold down fixture so that an

unencumbered vertical pull can be exerted. The end of the

test strip and the wire connecting the clamp to the tensile

tester must be free to pull vertically within 5°.

5.2.1.3

Prior

to starting test, allow immersed specimen to

stabilize at the specified temperature for laminates to 0.51 mm

[0.020 in] or for laminates greater than 0.51 mm [0.20 in].

5.2.1.4

Start

test and apply force in the vertical direction at

the rate of 50.8 mm [2.0 in] per minute, until at least 25.4 mm

[1.0 in] of the test strip has been pulled, or the strip breaks or

tears. (See 6.1).

5.2.1.5

Observe

and record the minimum load as defined

by Figure 1. Measure the actual width of the test strip and

record with the minimum load.

5.2.1.6

the full width of the test strip does not peel, the

results shall be discarded and another strip tested.

5.2.1.7

Perform

the procedure as per 5.2.1.1 through

5.2.1.4 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

the peel strength load as shown:

Lbs/in =

where:

Minimum load

Measured width of peel strip

5.3.2

Record

and report such individual peel strength value

as determined in 5.3.1. Average the individual peel strength

values for each side and each grain direction of the laminate

sampling. For example, if the sampling plan calls for one

specimen per side and per grain direction, there will be at

least two values to be averaged from four different specimens.

IPC-I-002102

Figure

1 Multiple Failure Modes

Peel Distance

▼

Load

High Peel Strength

Failure Mode

Low Peel Strength

Failure Mode

Minimum

Average

Load

IPC-TM-650

Number

2.4.8.2

Subject

Peel

Strength of Metallic Clad Laminates at Elevated

Temperature (Hot Fluid Method)

Date

12/94

Revision

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