IPC-TM-650 EN 2022 试验方法.pdf - 第161页

1.0 Scope 1.1 The purpose of this test method is to provide a proce- dure for determining the gel time of resin preimpregnated ‘‘B’’ Stage glass fabric. 2.0 Applicable Documents None. 3.0 Test Specimen 3.1 Sufficient qua…

IPC-23172-fig1

Figure

IPC-TM-650

Number

2.3.17.2

Subject

Resin

Flow of ‘‘No Flow’’ Prepreg

Date

8/97

Revision

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1.0

Scope

1.1

The purpose of this test method is to provide a proce-

dure for determining the gel time of resin preimpregnated ‘‘B’’

Stage glass fabric.

2.0

Applicable Documents

None.

3.0

Test Specimen

3.1

Sufficient

quantity of prepreg to yield approximately

1000 milligrams of dry resin powder.

4.0

Equipment/Apparatus

4.1

Platen,

hot plate or melting point apparatus capable of

maintaining a temperature of 171°±0.5°C (340°F ± 0.9°F).

4.2

Timer,

capable of determining time within ± 1 second.

4.3

Toothpicks.

4.4

Plastic/polyethylene

bags or suitable container.

4.5

Analytical

balance capable of weighing within ± 20 milli-

grams.

4.6

Wire

Mesh—60 mesh.

4.7

Montan

Wax.

5.0

Procedure

5.1

Place

the prepreg (B-Stage) in a plastic bag or other

suitable container, and extract the dry resin from the B-Stage

by folding or crushing.

5.2

Allow

the B-Stage resin to collect in the bottom of the

plastic bag.

5.3

Pour

the collected resin into a container through 60 wire

mesh, to remove any fiber glass particles.

5.4

Set

the melting point apparatus at 171°±0.5°C (340°±

0.9°F) and allow to stabilize at that temperature.

5.5

Using

the analytical balance weigh out 200 ± 20 milli-

grams of resin on to 3 in. x 3 in. sheet of wax paper or a suit-

able container.

5.6 Make

sure that the melting point apparatus is clean;

mold released with montan wax or equivalent; and wiped free

of any visible mold release.

5.7 Pour

200 milligram sample of resin on the center of the

melting point apparatus and start the timing device immedi-

ately.

5.8

Place

the tapered end of a round toothpick against the

surface of the cure plate (end of the toothpick not in contact

with surface of the cure plate will have to be elevated slightly).

5.9

Roll

toothpick back and forth, maintaining contact with

the surface of the cure plate until 20 seconds have elapsed.

5.10

this time start stroking the resin immediately, using

a circular motion 3/8 in. to 1/2 in. in diameter. Stroke in such

a manner that every circle moves part of the resin from the

center of the pool to the outside, and part of the resin from the

outside of the pool toward the center. Care should be taken

to limit the pool size to an area 3/4 in. to 7/8 in. in diameter.

5.11

Keep

the toothpick in contact with resin and surface of

the cure plate at all times. As the resin becomes stiff, it will not

be possible to continue exchanging outside resin with inside

resin, but continue stroking with as much exchange as pos-

sible without breaking the toothpick.

5.12

the resin breaks up, continue stroking the largest

piece. If this piece breaks up, continue stroking the largest

remaining piece of this portion even though now a larger piece

of the original pool may be present at some other place on the

hot plate.

5.13

When

the stroked piece separates from the hot plate,

stop the watch. This is the end point, and the total elapsed

time in the gel time.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.18

Subject

Gel

Time, Prepreg Materials

Date

4/86

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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1.0

Scope

This

test method is designed to measure the

volatile content of prepreg used as bonding plies in the manu-

facture of laminate and printed boards.

2.0

Applicable Documents

None

3.0

Test Specimens

3.1 Specimen Size

The

test specimen shall be a ply of

prepreg cut with its diagonal parallel to the X or Y axis of the

prepreg. The specimen shall be approximately 101.6 x 101.6

mm [4 in x 4 in]. A hole approximately 3.18 mm [0.125 in] in

diameter shall be punched in one corner of the specimen.

3.2

Quantity and Sampling

Unless

otherwise specified,

for each material tested, three specimens shall be prepared;

one specimen shall be cut from the center of the width and

one each from each edge of the sheet of prepreg. Specimens

shall be cut no closer than 25.4 mm [1 in] from the edge of the

prepreg sheet.

4.0

Apparatus or Material

4.1 Analytical Balance

Analytical

balance capable of

weighing to the nearest milligram [0.001 gram].

4.2

Oven

Air

circulating oven capable of maintaining ±

2.8°C[±5°F] at the specified test temperature (see Table 1).

4.3

Desiccator

Desiccation

chamber capable of maintain-

ing an atmosphere less than 30% R.H. at 23°C [73.4°F].

Vacuum drying systems, or equivalent, that could absorb or

remove organic components shall not be used.

4.4

Hanging Device to Support Prepreg

4.4.1

Paper

clip, alligator clip, or equivalent (Method A)

4.4.2

Clip

jig, as shown in Figure 1. (Method B)

5.0

Procedure

5.1 Specimen Preparation

5.1.1

The

prepreg shall be cut to conform with the speci-

men size and configuration as per 3.1.

5.1.2

Preconditioning

Unless

the prepreg is tested within

10 minutes of manufacture, specimens shall be desiccated for

24 ± 2 hours before testing. Specimens tested as part of

manufacturing control procedures are exempt from desicca-

tion. For referee testing, desiccation shall be performed. (See

6.1.)

5.2

Method A

5.2.1

Apply

mold release to the hanging device and allow to

air dry.

5.2.2

Weigh

the hanging device to the nearest milligram

[0.001 gram]. Record as W

5.2.3

Weigh

each specimen with a hanging device to the

nearest milligram [0.001 gram]. Record as W

5.2.4

Place

each specimen and hanging device in the air

circulating oven at the temperature and for the time specified

in Table 1 or by the governing document.

5.2.5

Remove

each specimen with the hanging device and

weigh within two minutes to the nearest milligram [0.001

gram]. Record as W

5.2.6

Calculate

and record the volatile content as follows:

Volatile content (%) =

(

− W

)

100

(see 5.2.2)

(see 5.2.3)

(see 5.2.5)

able 1

Prepreg

(1)

Material

Type

Oven

(1)

emperature

Test

(1)

ime

Difunctional Epoxy,

Tetrafunctional Epoxy,

Multifunctional Epoxy,

Polyimide Blend

163°C (325°F) 15 ± 1 minute

Polyimide 225°C (437°F) 30 ± 1 minute

Cyanate Ester 145°C (293°F) 15 ± 1 minute

(1) For material types that do not conform to the types listed,

follow the manufacturer’s instructions for temperature and

time.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.19

Subject

Volatile

Content of Prepreg

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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