IPC-TM-650 EN 2022 试验方法.pdf - 第653页

specimen between layers of absorbent paper and roll three or four times. Repeat until there is no apparent absorption by the paper. Place immediately into the tared weighing bottle, cover the bottle, weigh and record to …

1 Scope This test method defines the procedures to deter-

mine the moisture absorption properties of metal clad or

unclad flexible dielectrics.

2 Applicable Documents None

3 Test Specimen Prepare three specimens 10 cm x 10 cm

[approx.4 in x 4 in].

4 Apparatus

4.1 Test Chamber

Oven capable of maintaining the speci-

men at 105 - 110 °C [221 - 230 °F].

4.2 Analytical Balance Analytical balance having an accu-

racy of ± 0.001 gram.

4.3 Miscellaneous

4.3.1

Vessel for holding distilled water

4.3.2 Etcher

4.3.3 Chemical etchants

4.3.4 Desiccator - Capable of holding 30% RH at 23 °C ±

2 °C [73.4 °F ± 3.6 °F]

4.3.5 40 mm dia. x 125 mm long (minimum size) glass-

stoppered evaluating bottles

4.3.6 Absorbent, lint-free paper

4.3.7 25-30 mm [approx. 5-6 in] wide, 25 mm [approx.1 in]

diameter, elastomeric (70-80 durometer hardness Shore A)

roller

4.3.8 Dry polyethylene film that is cut larger in size than

work area

4.3.9 Hard, flat, non-absorbent surface (e.g., plate glass)

4.3.10 Distilled Water

4.3.11 Thermometer for distilled water

5 Procedure

5.1 Preparation

5.1.1

If the specimen under test is a metal clad dielectric,

proceed to 5.1.2. If it is an adhesive coated dielectric, lami-

nate it with a release sheet next to adhesive or laminate to

copper foil using time, temperature, and pressure, which will

impart a normal state of cure to the adhesive. If the specimen

is a bare dielectric, proceed directly to 5.1.3.

5.1.2 Etch away all copper from the specimen using the

chemical etchants and etcher and wash thoroughly with dis-

tilled water.

5.1.3 Weighing Bottle Tare Weight Dry a weighing bottle

and its glass stopper for each specimen at 105 °C - 110 °C

[221 °F - 230 °F] for a minimum of one hour. Immediately

place both the bottle and its stopper in a desiccator, allow

both to cool to room temperature, stopper the bottle and then

weigh and record to nearest 0.001 gram. Return each stop-

pered weighing bottle to desiccator.

5.2 Test

5.2.1

Dry the specimen(s) from 5.1.3 in an oven at 105 °C -

110 °C [221 °F - 230 °F] for one hour±5minutes. Place each

specimen in a tared weighing bottle, re-stopper and then

weigh to nearest 0.001 gram. Repeat the drying cycle at least

once or until constant weight is reached. Record this constant

weight. Return weighing bottles to desiccator.

5.2.2 Immerse the specimen for 24 hours - 0 minutes/+30

minutes in a container filled with distilled water at a tempera-

ture of 23 °C±2°C[73.4 °F ± 3.6 °F]. Specimens should rest

individually on edge, supported by a racking system in the

container and shall not be in surface-to-surface contact with

each other.

5.2.3 Remove the specimens individually from the water and

lay on a panel of dry polyethylene film, which, in turn, is laid on

a flat surface. Using an elastomeric roller, roll the surface of

the specimen three or four times in one direction until the sur-

face is free of water. Turn the specimen over on a dry area of

the polyethylene film and repeat the preceding step. Place the

3000 Lakeside Drive, Suite 309S

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.6.2

Subject

Moisture Absorption, Flexible Printed Wiring

Date

2/12

Revision

Originating Task Group

Flexible Circuits Test Methods Subcommittee

(D-15)

Material in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.

Page1of2

specimen between layers of absorbent paper and roll three or

four times. Repeat until there is no apparent absorption by the

paper. Place immediately into the tared weighing bottle, cover

the bottle, weigh and record to the nearest 0.001 gram.

NOTE: This is the most critical part of the test. Care must be

given to removing moisture from the specimens. Limit time

between removal from water to putting in weighing bottle to

≤30 seconds.

5.3 Evaluation Calculate the water absorption for each

specimen as follows:

Percent of Absorption =

− W

x 100

where:

= weight before immersion (see 5.2.1)

= weight after immersion (see 5.2.3)

Average the results of the three specimens and report this

average to nearest 0.1%.

NOTE: If the range of results for the three individual speci-

mens exceeds1%, the test must and shall be repeated.

IPC-TM-650

Number

2.6.2

Subject

Moisture Absorption, Flexible Printed Wiring

Date

2/12

Revision

Page2of2

1.0

Scope

This

test method is designed for use in deter-

mining the amount of water absorbed by plastic laminates

when immersed in distilled water for 24 hours.

2.0

Applicable Documents

IPC-TM-650

Method

2.3.6, Etching Ammonium Persulfate

Method

IPC-TM-650 Method

2.3.7, Etching, Ferric Chloride Method

IPC-TM-650

Method

2.3.7.1, Etching Cupric Chloride

3.0

Test Specimens

3.1 Dimensions

The

test specimens used in this test shall

be 2.0 inches long by 2.0 inches wide by the thickness of the

material (unless otherwise specified). Tolerance on length and

width shall be ±.03.

3.2

Edge Finish

The

edges of the specimens shall be milled

or sanded smooth with 400 grit sandpaper.

3.3

Number of Specimens

Three

specimens shall be used

for this test.

3.4

Removal of Metal Cladding

The

metal cladding shall

be removed by etching per IPC-TM-650, Methods 2.3.6,

2.3.7 or 2.3.7.1, or other suitable method which does not

affect the surface of the laminate.

4.0

Apparatus

4.1

Circulating

air oven capable of maintaining a uniform

temperature of 105° to 110°C (221° to 230°F).

4.2

Desiccator

stabilization chamber (drying cabinet)

capable of maintaining less than 20% R.H. at 21 ±2°C.

4.3

Analytical Balance

5.0 Procedure

5.1 Cleaning

The

specimens shall be cleaned by at least

three repeated wipings with a clean damp cloth.

5.2

Conditioning

The

specimens shall be conditioned by

drying in an oven for 1 hour at 105° to 110° (221° to 230°F),

cooled to room temperature in a desiccator, and weighed

immediately upon removal from the desiccator.

5.3

Weighing

The

weight of each conditioned specimen

shall be determined to the nearest 0.1 milligram and recorded.

5.4

Immersion

The

conditioned specimens shall be placed

in a container of distilled water maintained at 23°±1.1°C (73.5

±2°F) and shall rest on edge entirely immersed. At the end of

24 hours minus 0 plus 30 minutes, the specimens shall be

removed from the water one at a time, all surface water

removed with a dry cloth, and weighed immediately. A weigh-

ing bottle shall be used for materials where water absorption

during weighing has been demonstrated to significantly affect

results.

5.5

Calculations

Calculate

and record the percent

increase in weight for each specimen to the nearest 0.01 per-

cent as follows:

Increase in weight, percent =

wet weight—conditioned weight

conditioned

weight

X 100

5.6

Report

the average for the three specimens.

Report individual specimen results when requested.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.6.2.1

Subject

Water

Absorption, Metal Clad Plastic Laminates

Date

5/86

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.

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