IPC-TM-650 EN 2022 试验方法.pdf - 第130页

a . Dwell time in etcher necessary for complete copper removal, if longer than normal. b. Warpage or distortion of the material. c. Discoloration or other visual changes to the material. 6.0 Notes 6.1 If the etching time…

1.0

Scope

This

method is a means for preparation of test

specimens for determination of bare dielectric material quality

and properties, using an alkaline etching solution for removal

of copper cladding.

2.0

Applicable Documents

IPC-TM-650

Method

2.3.1.1, Chemical Cleaning of Metal Clad Laminate

3.0

Test Specimens

The

size of lot samples or test speci-

mens shall be determined by the inspections or tests to be

performed after etching and the capabilities of the etching

equipment.

4.0

Apparatus or Material

4.1

Standard

chemical etching chamber or laboratory

equipment suitable to the etchant chemistry.

4.2

Air

circulating oven capable of maintaining the specified

temperatures and tolerances.

4.3

Personal

safety equipment shall include: rubber or poly-

ethylene gloves, plastic or coated apron, and safety goggles.

4.4

Chemicals

Chemical

Concentration

Chloride 170 grams per liter

Copper 150 grams per liter

Ammonium Hydroxide 5.5 M

(NH

OH)

Specific gravity = 1.20

Reagent grade isopropyl

alcohol (IPA) As required

Distilled/Deionized Water As required

4.5

Pattern Developing Materials

Etch

resist system or

materials capable of producing the applicable conductor pat-

terns.

5.0

Procedure

5.1 Preparation of Specimen

5.1.1

Shear

the material to the appropriate sample or speci-

men size and if necessary remove the rough edges from the

specimen by sanding or other suitable means. Specimens

may be chemically cleaned in accordance with IPC-TM-650,

Method 2.3.1.1. Specimens may also be mechanically

cleaned.

5.1.2

a conductor pattern is required, prepare the material

by applying etch resist according to standard industry prac-

tices.

5.2

Etching

5.2.1

Remove

the metal cladding by etching in a convey-

orized spray chamber or other suitable vessel containing 22 to

23 BAUME alkaline etching solution maintained at 51.7

±5.6°C [125 ±10°F]. Etching time shall be minimized to pre-

vent overexposure of the bare laminate material to the etching

solution and yet allow for complete removal of the exposed

metal cladding. if the specimens are etched in a laboratory

environment, vigorous agitation may be required.

5.2.2

Rinse

the specimens thoroughly.

5.3

Cleaning

5.3.1

etch resist has been used, samples shall have the

resist or tape removed by standard industry practices.

5.3.2

When

electrical testing is required on the material, do

not allow the etched specimens to dry before they go through

the cleaning process. For general testing, scrubbing with a

soft natural bristle brush under running tap water and rinsing

with distilled water or deionized water may be adequate. For

critical testing and for referee testing, laminates shall be

soaked for 10 ±1 minutes in reagent grade IPA followed

immediately by a 10 minute rinse in flowing 16 megaohm

deionized water.

5.4

Drying

Samples

may be air dryed for subsequent

material evaluations. For referee testing, an oven bake for 1

hour at 80 ±5.6 °C [176 ±10°F] is required.

5.5

Evaluation

Determine

and record whether the etching

procedure resulted in any unusual events, such as:

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.7.2

Subject

Alkaline

Etching 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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. Dwell time in etcher necessary for complete copper

removal, if longer than normal.

b. Warpage or distortion of the material.

c. Discoloration or other visual changes to the material.

6.0 Notes

6.1

the etching time exceeds 15 minutes for 1 oz/sq. ft.

copper or 30 minutes for 2 oz/ sq. ft. copper, renew the etch-

ing solution.

6.2 Alkaline

etchant is toxic and extreme caution should be

exercised.

6.3

The

time to etch a clean pattern with a minimum of

undercutting should be approximately 7 minutes for 1 oz./sq.

ft. copper, and 15 minutes for 2 oz./sq. ft. copper using a

fresh solution.

IPC-TM-650

Number

2.3.7.2

Subject

Alkaline

Etching Method

Date

12/94

Revision

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1.0

Scope

This

test method is designed to determine the

degree of flame resistance of laminates less than 0.5 mm

[0.020 in] in thickness, and prepreg.

2.0

Applicable Documents

IPC-TM-650

Method

2.3.6, Etching, Ammonium Persulfate

Method 2.3.7, Etching Ferric Chloride

Method 2.3.7.1, Cupric Chloride Etching

Method 2.3.7.2, Alkaline Etching

3.0

Test Specimens

3.1 Size

The

test specimen shall be 25.4 mm [1.0 in] wide

by 457 mm [18 in] long by the thickness of the material cut

from the sheet such that the 457 mm [18 in] dimension is par-

allel to the warp yarn. The specimen shall be marked 152.4

mm [6 in] from one end. This mark may be made by cutting a

small nick into the edge of the strip.

3.2

Quantity and Sampling

minimum of three speci-

mens shall be used for each material tested and each test

condition, unless otherwise specified. The specimens shall be

cut from various locations across the width of the sheet no

closer than 25.4 mm [1.0 in] from the edge of the sheet.

4.0

Apparatus or Material

4.1 Test Chamber

laboratory hood, totally enclosed,

with a heat-resistant glass window for observing the test, shall

be used. The exhaust fan shall be turned off during the test,

but may be turned on to clear out the fumes between tests.

4.2

Speciman Holder

Clamping

device shall be provided

within the test chamber so that the specimen will hang with its

length in a vertical position approximately coincident with the

central vertical axis of the test chamber.

4.3

Laboratory Burner

Bunsen or Tirrill Burner shall be

used having a tube length of 101.6 mm [4.0 in] and an inside

diameter of 9.4 mm [0.370 in]. The burner shall not be

equipped with end attachments.

4.4

Gas Supply

The

gas supply shall be regulated and

metered for uniform flow. The standard gas shall be Technical

Grade methane. Natural gas having a nominal heat content of

1000 BTU per cubic foot [37 MJ/m

]

or [37 megajoule per

cubic meter] may be substituted. Other fuel gases such as

butane, propane and acetylene may be used provided they

are equivalent in flame temperature. Technical grade methane

shall be used for referee testing.

4.5

Timer

Stopwatch

or other suitable timing device with a

precision of 0.5 seconds, minimum.

4.6

Desiccator

Desiccation

chamber capable of maintain-

ing an atmosphere of less than 30% RH at 23°C [73°F].

4.7 Conditioning

oven of circulating draft type capable of

maintaining 125 ± 2°C [257 ± 3.6°F].

4.8

Thin

steel scale or template for gauging flame height.

4.9

Etching

system capable of complete removal of the

metal cladding.

4.10

Cutting

apparatus such as shears or equivalent equip-

ment.

5.0

Procedure

5.1 Specimen Preparation

Metal-clad

laminates shall be

completely etched using standard industry practices (see IPC-

TM-650, Methods 2.3.7, 2.3.7.1, or 2.3.7.2). Unclad laminate

and prepreg shall be tested in the as-is condition. Specimens

shall be cut to size in accordance with 3.1.

5.2

Conditioning

Unless

otherwise specified, the speci-

mens shall be conditioned in standard ambient laboratory

conditions of 23 ± 2°C [73 ± 3.6°F] and 50 ± 5% RH for a

minimum of 24 hours prior to testing.

5.3

Specimen Mounting

specimen shall be clamped to

the clamping device in the chamber so that the specimen

hangs with its length in a vertical position approximately coin-

cident with the central vertical axis of the test chamber. The

marked end of the specimen shall be nearest the laboratory

burner. The lower end of the specimen shall be at a height

25.4 mm [1.0 in] more than the height of the laboratory burner

used to provide the ignition, as shown in Figure 1.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.9

Subject

Flammability

of Prepreg and Thin Laminate

Date

8/97

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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