IPC-TM-650 EN 2022 试验方法.pdf - 第652页

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 …

fine

mist from a previously sterilized atomizer or nebulizer. In

spraying the test and control items, care should be taken to

spray all surfaces which are exposed during use or mainte-

nance. If the surfaces are nonwetting, spray until initiation of

droplet coalescence. Incubation is to be started immediately

following the inoculation.

5.5

Test Incubation of Test Items

5.5.1

Incubate

test items under static temperature of

28-30°C [82.4-86°F] with a minimum 85% relative humidity.

5.5.2

After

seven days, inspect the growth on the control

items to be assured that the environmental conditions are

suitable for growth. If inspection reveals that the environmen-

tal conditions are unsuitable for growth, the entire test shall be

repeated.

5.5.3

the control items show satisfactory fungus growth,

continue the test for a period of 28 days from the time of

inoculation, or as specified.

5.6

Evaluation

5.6.1

Report

those specimens which were found to be nutri-

ent to fungus growth.

5.6.2

Corrosion

should be noted separately from the fungus

test results.

6.0 Notes

6.1

Source for Micro-organisms

6.1.1

American

Type Culture Collection

10801 University Blvd.

Manassas, VA 20110-2209 (USA)

703-365-2700

http://www.atcc.org

6.2

Secondary Sources for Microorganisms

6.2.1

Pioneering

Research Division

U.S. Army Natick

Laboratories

Natick, Massachusetts 01760

6.2.2

North

University St.

Peoria, IL 61604

Contact: Dr. Stephen Peterson

309-685-4011

6.3

After

evaluation, the materials and the test chamber

must be decontaminated by exposure on all sides to ultravio-

let rays (360 nm) for a minimum of two hours, or sprayed with

a solution of 1:750 zephiran chloride solution. (One part zephi-

ran chloride to 750 parts distilled water).

6.4

Safety

Observe

all appropriate precautions on MSDS

for chemicals involved in this test method.

IPC-TM-650

Number

2.6.1.1

Subject

Fungus

Resistance – Conformal Coating

Date

07/00

Revision

age3of3

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

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