IPC-TM-650 EN 2022 试验方法.pdf - 第132页

Note: A small weight may be hung from the lower end of the specimen by a wire at least 127 mm [5.0 in] in length to pre- vent it from curling during burning. 5.4 Adjustment of Test Flame The burner is ignited and adjuste…

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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Note:

small weight may be hung from the lower end of the

specimen by a wire at least 127 mm [5.0 in] in length to pre-

vent it from curling during burning.

5.4

Adjustment of Test Flame

The

burner is ignited and

adjusted to produce a blue flame 25.4 mm [1.0 in] high. The

correct flame is obtained by adjusting the gas supply and the

air ports of the burner until a blue flame with a yellow-tipped

outer cone 25.4 mm [1.0 in] high is produced. The air supply

is increased slightly by opening the air ports only until the yel-

low tip just disappears and completely blue inner and outer

flame cones are formed. The flame is remeasured for correct

height. The procedure is repeated as necessary until all con-

ditions are met. The burner tube is vertical during adjustment

and testing.

5.5

Measurement

Position the burner beneath the speci-

men and allow the flame to impinge upon the specimen for 5

± 0.5 seconds (see 6.3). Remove the burner from beneath the

specimen, and determine the time from removal of burner to

when burning has stopped. Record the time of burning and

record whether the burning has progressed beyond the 152.4

mm [6.0 in] length. If the burning has progressed beyond the

152.4 mm [6.0 in] mark, measure the total length of the

burned material.

5.6

Evaluation

5.7.1 Nonburning by This Test

the specimen does not

ignite on two attempts, it shall be reported as ‘‘Nonburning by

this test.’’

5.7.2

Burning by This Test

a specimen burns up to

152.4 mm [6.0 in], it shall be reported as ‘‘Burning by this

test.’’

5.7.3

Self-extinguishing by This Test

a specimen

begins to burn after the first or second ignition but extin-

guishes before the flame burns up to 152.4 mm [6.0 in], it

shall be reported as ‘‘Self-extinguishing’’ by this test.

5.8

Report

the total time of burn and the total length of burn.

6.0 Notes

6.1

Since

laminates and prepregs do not drip molten or

flaming material, provisions for this evaluation have been

deleted from the method.

6.2

The

inside of the burner barrel should be cleaned fre-

quently. Specimen combustion by-products can collect

around and inside the barrel tip. These deposits can be

flushed out during burner ignition and flame adjustment result-

ing in a false yellow flame tip. Proper flame adjustment

becomes very difficult.

6.3

Desiccator Conditions

The

Test Methods Task Group

determined that a great majority of test laboratories are unable

to consistently hold the Relative Humidity in a desiccator to

less than 20%. Based on data from participating company lab

management, the lowest practically feasible RH for use with

the affected IPC Test Methods is 30% maximum.

IPC-239-fig1

Figure

25.4 mm

(1 inch)

457 mm

(18 inches)

152.4 mm

(6 inches)

101.4 mm

(4.0 inches)

25.4 mm

(1 inch)

Laboratory

Burner

Small Weight

IPC-TM-650

Number

2.3.9

Subject

Flammability

of Prepreg and Thin Laminate

Date

8/97

Revision

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1.0

Scope

This

test method is designed to determine the

degree of flame resistance of metal-clad or unclad laminate. It

is intended for use on laminate of thicknesses 0.51 mm [0.020

in] and greater.

2.0

Applicable Documents

IPC-TM-650

Method

2.3.6, Etching, Ammonium Persulfate Method

Method 2.3.7, Etching, Ferric Chloride Method

Method 2.3.7.1, Cupric Chloride Etching Method

Method 2.3.7.2, Alkaline Etching

UL-STD-94, Flammability

3.0

Test Specimens

3.1 Size

Test

specimens shall be 127± 0.64 mm [5.0 ±

0.025 in] in length and 12.7 ± 0.51 mm [0.5 ± 0.020 in] in

width by the thickness being tested. Edges shall be smoothed

after cutting; any radius imparted to the corners shall not

exceed 1.27 mm [0.05 in].

3.2 Quantity and Sampling

Specimens

may be taken par-

allel to either grain direction, unless otherwise specified. Five

specimens shall be prepared for each condition required.

Reserve sets of five specimens should also be prepared in the

event a retest is necessary.

4.0

Apparatus or Material

4.1 Test Chamber

laboratory hood, totally enclosed,

with a heat-resistance glass window for observing the test,

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

test, but may be turned on periodically to clear out the fumes

between tests.

4.2

Specimen Holder

Clamping

device adjustable for ver-

tical positioning of the test specimen 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 or other fuel gases such as

butane, propane and acetylene may be used, provided they

have a nominal heat content of 1000 BTU per cubic foot.

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 removing metal-cladding

from the laminate.

4.10

Cutting and edge smoothing apparatus such as

shears, diamond blade saw, or other equipment, and sanding

or routing equipment for smoothing.

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 lami-

nates shall be tested in the as-is condition. Specimens shall

be cut to size and the edges smoothed, in accordance with

3.1.

5.2

Specimen Conditioning

5.2.1

Specimen

sets shall be conditioned prior to testing by

exposure to standard laboratory conditions of 23 ± 2°C

[73 ± 3.6°F] and relative humidity of 50 ± 5% for 24 hours

minimum.

5.2.2 If

specified, a second set of specimens shall be

conditioned for 24 ± 2 hours at a temperature of 125 ± 2°C

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.10

Subject

Flammability

of Laminate

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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