IPC-TM-650 EN 2022 试验方法.pdf - 第654页

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 A…

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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Scope

This

test method is to determine the degradation

of insulating materials by examination of the visual and electri-

cal insulation resistance properties of printed board speci-

mens after exposure to high humidity and heat conditions.

This method allows testing with (Method A) or without

(Method B) Conformal Coating. When not specified, Method A

is the default method.

Applicable Documents

IPC-CC-830

Qualification

and Performance, Insulating Com-

pounds for Printed Circuits Assemblies

Test Specimens

3.1

Test

specimens shall be comprised of a minimum of two

conductor lines per conductive layer, sufficient to allow resis-

tance testing between adjacent conductor patterns both

between layers and on the same layer. See 6.1 for examples

of test specimen patterns recommended for this test method.

Apparatus or Material

4.1

clean test chamber capable of programming and

recording an environment of temperature ranging between

25 °C ± 2 °C [77 °F ± 4 °F) and 65 °C ± 2 °C [149 °F ± 4 °F],

and 85% to 93% relative humidity.

4.2

power supply capable of producing a standing bias

potential of 100 volts DC with a tolerance of ± 10%.

4.3

resistance meter capable of reading high resistance at

the voltage described in the procurement documentation.

4.4

Solder or Flux-Cored Solder

Flux

shall be removable

in a manner which will not adversely affect the test specimen.

4.5

Soft

Bristle Brush.

4.6

Deionized

or distilled water (2 megohm-cm, minimum

resistivity recommended).

4.7

Isopropyl

alcohol.

4.8

Drying

oven(s) capable of maintaining 50 °C ± 5 °C

[122 °F ± 9 °F] and 125 °C ± 5 °C [257 °F ± 9 °F].

4.9

Insulating

compound (conformal coating) which con-

forms to IPC-CC-830.

4.10 Equipment

necessary to apply and cure conformal

coating.

Procedure

5.1 Specimen Preparation

5.1.1

Mark

specimen with positive, permanent, and non-

contaminating identification.

5.1.2

Visually

inspect the test specimens for any obvious

defects, as described in the applicable performance specifica-

tion. If any test specimen is noncompliant, the test specimen

should be replaced and the replacement noted.

5.1.3

Solder

single stranded (to decrease the opportunity for

flux contamination from the wire) insulated wire which is not

affected by the test environment to each of the connection

points of the test specimens. These wires will be used to con-

nect the test patterns of the test specimens to the power

supply and for insulation resistance testing.

5.1.4

Clean

test lead terminals with isopropyl alcohol and

scrub with a soft bristle brush for a minimum of 30 seconds.

During the remainder of the test specimen preparation, handle

test specimens by the edges only (see 6.2).

5.1.5

Spray

rinse thoroughly with fresh isopropyl alcohol.

Hold test specimen at an approximate 30° angle and spray

from top to bottom.

5.1.6

Rinse

cleaned area thoroughly with fresh deionized or

distilled water. Hold test specimen at an approximate 30°

angle and spray from top to bottom.

5.1.7

Dry

test specimens in a drying oven for a minimum of

three hours at an oven temperature of between 50 °C ± 5 °C

[122 °F ± 9 °F) (see 6.3).

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.6.3

Subject

Moisture

and Insulation Resistance, Printed Boards

Date

05/04

Revision

Originating Task Group

Rigid Printed Board Performance Task Group

(D-33a)

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.

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ASSOCIA

TION CONNECTING

ELECTRONICS INDUSTRIES

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