IPC-TM-650 EN 2022 试验方法.pdf - 第121页

and of a thickness when cured not greater than 0.13 mm [0.005 in] total, using the prepreg manufacturer’s recom- mended press cycle. Laminate over 0.5 mm [0.020 in] shall be treated like double clad laminate without lami…

1.0

Scope

This

method is designed to evaluate the resis-

tance of dielectric materials to organic chemicals representa-

tive of those used in printed board fabrication and assembly.

It is intended to provide a distinction between materials of

varying chemical resistance and, when applicable, an indica-

tion of the degree of cure.

2.0

Applicable Documents

IPC-TM-650

Method

2.2.18, Determination of Thickness of Laminates by

Mechanical Measurement

Weast, R.C., CRC Handbook of Chemistry and Physics, 65th

Edition, E-37, 1984

3.0

Test Specimens

3.1 Number

Unless

otherwise specified, three specimens

shall be used.

3.2

Size

Unless

otherwise specified, specimen shall be

50.8 x 50.8 mm ± 0.5 mm [2.0 x 2.0 ± 0.02 in] by the thick-

ness of the material (see 5.1, Preparation). Edges shall be

smooth, whether by the cutting procedure, or by sanding, or

other means.

3.3

Location

Specimen

may be cut from anywhere in the

sheet of material, except no specimens shall be taken closer

than 25.4 mm [1.0 in] from any edge as laminated.

4.0

Apparatus or Material

4.1

Analytical

balance with a draft shield and .001 gram or

better resolution.

4.2

Air

circulating oven, capable of 105 ± 2°C [221 ± 3.6°F].

4.3

Desiccator

capable of maintaining an atmosphere of less

than 30% relative humidity at 23°C [73°F]. See 6.2.5

4.4

Cutting

apparatus such as diamond saw, shear paper

cutter or router.

4.5 Edge

smoothing apparatus such as 400 grit or finer

sandpaper.

4.6

One

liter battery jar, with cover.

4.7 Metal tongs or forceps.

4.8

Metal

rack (to support specimens vertically).

4.9

Metal

support (e.g., mounting clip used for microsec-

tioning).

4.10

Laminating

press capable of the specified temperature

and pressure.

4.11

Timer:

1 hour with 1 second resolution.

4.12

Timer:

60 seconds, 1 second resolution.

4.13

Solvent:

Methylene Chloride, Reagent Grade or HPLC

Grade. MC recovered by distillation back to reagent grade

may be used. HPLC Grade shall be used for referee pur-

poses.

4.14

Prepreg

(for single sided laminate and coated foil test

only).

4.15 Copper

foil, 1 oz./ft

treated

(for prepreg tests only).

4.16

Ventilation

hood

4.17 Micrometer,

capable of measuring to within 0.025 mm

[0.001 in]

4.18

Water

bath at 23 ± 0.5°C [73 ± 0.9°F].

4.19

Thermometer

capable of measuring to within 0.1°C

resolution.

4.20

Etching

system capable of metallic cladding removal.

5.0

Procedure

5.1 Sample Preparation

5.1.1 Single-sided Laminate

Single-sided

laminate less

than 0.5 mm [0.020 in] shall be laminated together with the

clad surfaces facing out. Two plies minimum of prepreg shall

be used. The prepreg shall be of the same basic resin type

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.4.2

Subject

Chemical

Resistance of Laminates, Prepreg, and

Coated Foil Products, by Solvent Exposure

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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and

of a thickness when cured not greater than 0.13 mm

[0.005 in] total, using the prepreg manufacturer’s recom-

mended press cycle. Laminate over 0.5 mm [0.020 in] shall be

treated like double clad laminate without lamination.

5.1.2

Resin-coated Foil

Resin-coated

foil samples shall

be laminated together using at least two plies of prepreg

between the coated sides of the foil. The prepreg shall be of

the same basic resin type and of a thickness when cured not

greater than 0.127 mm [0.005 in] total, using a press cycle

and any subsequent post cure which meets the manufactur-

er’s recommendations for both the coated foil and prepreg.

(See 6.2.1.1)

For qualification and referee tests, a 0.50 ± 0.10 mm [0.02 in]

composite core is to be built.

5.1.3

Laminate with Coated Foil Surfaces

Single-sided

laminate

shall be tested after lamination as in 5.1.1. Double-

sided laminate with coated foil on one side shall have the foil

etched from the uncoated side and shall subsequently be

laminated as 5.1.1. Double-sided laminate with coated foil on

both sides shall be tested as is.

5.1.4 Prepreg

Prepreg

shall be laminated to a thickness of

0.50 ± 0.10 mm [0.020 in] using treated copper foil on both

sides and following the prepreg manufacturer’s recommended

press and post cure cycle. (See 6.2.1.1) For prepreg less than

0.13 mm [0.005 in] thick when cured, at least two plies shall

be bonded to either side of an etched laminate of a thickness

such that the pressed sample satisfies the required thickness.

5.1.5

Double-sided Laminate

Double-sided

laminate shall

be submitted for testing as is.

5.2

Specimen Preparation

5.2.1 Etching

Samples,

as specified in 3.0, shall be etched

in accordance with standard industry practices. For referee

purposes, 2.3.6, 2.3.7, 2.3.7.1, or 2.3.7.2 shall be used.

5.2.2

Cut

the specimens to size per 3.2. Cutting shall be

performed using apparatus and in such a manner that pre-

vents edge damage. Edge smoothing is recommended to

prevent excessive absorption.

5.2.3

Markings

Each

specimen shall be identified by mark-

ing with a lead pencil or equivalent technique which is not

removed by the solvent and which doesn’t affect the results.

5.3

Preconditioning

5.3.1

Measure

and record nominal thickness of the test

specimen using IPC-TM-650, Method 2.2.18.

5.3.2

Place

the etched specimens vertically in the metal

rack and dry the specimens in the oven for 60 ± 5 minutes at

105°C [221°F]. Air flow around each specimen must be

assured.

5.3.3

Remove

the specimens from the oven and immedi-

ately place in the desiccator to cool for 60 ± 30 minutes.

5.4

Test Condition

The

test shall be performed at stan-

dard laboratory conditions: 23 ± 2°C [73 ± 0.9°F] and 50 ± 5%

R.H.

5.5

Measurement

5.5.1

Fill

the battery jar with 750 ml of solvent and maintain

the solvent temperature at 23 ± 0.5°C [73 ± 0.9°] using the

water bath.

5.5.2

Remove

the specimens individually from the desicca-

tor and weigh to the nearest milligram on the analytical bal-

ance. Samples must be weighed within 60 seconds of

removal from the desiccator. Record these weights as W

5.5.3 Place the rack into the beaker of solvent, start the 60

minute timer and using tongs place the specimens in the rack

at suitable intervals (recommend approximately 2 minutes).

Insure that the specimens are completely immersed.

5.5.4

Place

the metal clip on the balance and tare it out.

5.5.5 After

10 minutes +15, –0 seconds, using the tongs

remove the first specimen from the solvent and start the 60

second timer.

5.5.6

Slowly

wag the specimen in the air. As soon as the

specimen is free of surface wetness, but no longer than 30

seconds, place the specimen on the balance supporting it on

the metal clip such that both surfaces of the specimen are

exposed (placing the specimen flat on the balance pan is not

permitted since evaporation from the side next to the pan will

be reduced.)

IPC-TM-650

Number

2.3.4.2

Subject

Chemical

Resistance of Laminates, Prepreg, and Coated Foil

Products, by Solvent Exposure

Date

12/94

Revision

age2of4

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5.5.7

After

60 +5, –0 seconds from the time of removal from

the solution, note the weight of the specimen and record it as

5.5.8

Repeat

5.5.5 – 5.5.7 for the remaining specimens

insuring the immersion time of each specimen is kept within

the tolerance.

5.5.9 A

fresh batch of solvent shall be used for no more

than 18 specimens or for a period of time no longer than 8

hours.

5.6

Evaluation

5.6.1 Weight Gain

5.6.1.1

Subtract

the dry weight of each specimen, W

from

the final weight, W

each specimen after immersion.

Record the weight gain in mg.

5.6.1.2 Calculate

the average weight gain in mg.

5.6.2

Appearance

Examine

the specimens using 20/20

vision for any changes to the appearance of the material, such

as hazing, whitening or swelling.

5.7

Report

5.7.1

Report

the average weight gain in milligrams for the

material tested.

5.7.2 Report

the measured specimen thickness.

5.7.3

Report

actual test conditions for temperature and

humidity and the solvent temperature.

5.7.4

Report

any anomalies in the test or any variations from

the specified procedures or tolerances.

5.7.5

Report

any changes in the visual quality of the speci-

mens as determined in 5.6.2.

6.0 Notes

6.1 Safety Considerations

See

the MSDS sheet for the

solvent used before running this test.

6.1.1 During

test, the beaker with the test solvent should be

covered or under a ventilation hood.

6.1.2

Dispose

of the spent solvent in accordance with local

regulations.

6.2

Factors Affecting Tests

6.2.1 Sample

6.2.1.1 Same Sample

The

results obtained on the same

sheet of material may be significantly affected by the degree

of cure of the material and the thermal history of the sample.

6.2.1.2

Variation Due to Thickness of Sample

There

is a

very small difference due to sample thickness. This is under

10% on typical epoxy materials for 0.2 mm [0.008 in] to 1.5

mm [0.060 in] and under 5% on more chemical resistant

material from 0.13 mm [0.005 in] to 1.5 mm [0.060 in].

6.2.2

Accuracy

Since

there are no standards for this type

of test, the accuracy of the method cannot be established.

6.2.3

Precision

the

reproducibility of this test depends on

the degree of control over the controlled variables and some

other variables such as atmospheric pressure, which are gen-

erally not controlled in industrial laboratories. Precision

between laboratories with 20% to 50% RH was 10% at the 90

mg level and 16% at the 25 mg level.

6.2.4

Desiccants

capable of 0.002 mg mois-

ture levels include P

205

Mg (C10

)

anhydrous BaO and

fused KOH.

Some other desiccants such as CaCl

result

in considerably

higher moisture levels and may not be used in this test. (See

Weast R.C., CRC Handbook of Chemistry and Physics, 65th

edition, E–37, 1984.)

6.2.5

Humidity Considerations

6.2.5.1 Effect of Humidity

Higher

humidity will produce

higher solvent pickup due to retarded solvent evaporation.

6.2.5.2

Control of Humidity

Control

of the critical environ-

ment can be obtained in uncontrolled laboratories using an

enclosed balance with a saturated salt solution of Mg(No

)

(for 50% RH).

All significant openings in the enclosure are sealed with tape

and an inner door is fabricated with a small opening for

sample entry and exit. A shallow pan is fabricated to occupy

most of the balance floor without contacting the weighing

IPC-TM-650

Number

2.3.4.2

Subject

Chemical

Resistance of Laminates, Prepreg, and Coated Foil

Products, by Solvent Exposure

Date

12/94

Revision

age3of4

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