IPC-TM-650 EN 2022 试验方法.pdf - 第151页

1.0 Scope This method is designed to determine the resin content of a prepreg without removing the resin from the rein- forcement. The basis weight of the fabric must be known. This method is applicable to both organic a…

1.0

Scope

This

method is designed to determine the resin

content percent of prepreg which is reinforced with inorganic

fabric, by removal of the resin from the reinforcement using a

burn-off step.

2.0

Applicable Documents

None.

3.0

Test Specimens

3.1 Size

Specimens

shall be approximately 102 mm x 102

mm [4.0 in. x 4.0 in]. If the reinforcement is a continuous fiber

woven fabric, the sides shall be cut on a bias to the orienta-

tion of the fabric.

3.2

Quantity and Sampling

Unless

otherwise specified,

three specimens shall be taken equally spaced across the

width (web) of a roll or from different locations in a predeter-

mined quantity of paneled prepreg, such as an inspection lot.

4.0

Apparatus or Material

4.1 Analytical Balance

Analytical

balance capable of

weighing to the nearest milligram [0.001 gram].

4.2 Muffle Furnace

Muffle

furnace capable of maintaining

550 ± 50°C [1022 ± 90°F].

4.3

Crucible

of sufficient size and type to hold the

specimen when placed in a muffle furnace.

4.4

Cutting Apparatus

Shears

or other equipment

capable of cutting specimens to the specified size.

4.5

Desiccator

Desiccation

chamber capable of maintain-

ing an atmosphere less than 30% R.H., at 23°C [73°F].

5.0

Procedure

5.1 Specimen Preparation

5.1.1

Cut

the specimens to the specified size.

5.1.2

Unless

the prepreg is tested within 10 minutes of its

manufacture, the specimens shall be desiccated for a mini-

mum of 4 hours. For referee testing, the specimens shall be

desiccated.

5.2

Measurement

5.2.1

Each specimen shall be weighed in a previously

weighed crucible to the nearest milligram.

5.2.2

Place

the crucible containing the specimen in the

muffle furnace maintained at 550 ± 50°C [1022 ± 90°F] for 5

minutes, minimum.

5.2.3

Remove

the crucible with contents from the furnace

and place in the desiccator until cooled to room temperature.

Note:

the contents of the crucible shows evidence of glass

fusion, discard the specimen and repeat the test with a new

specimen, except lower the temperature of the muffle furnace

by 50°C [122°F]. If the contents show evidence of incomplete

combustion of the resin, increase the temperature of the fur-

nace or extend the time of combustion. In any case, the

residual glass cloth, after combustion, must be completely

free of resin residue, and show no evidence of glass fusion.

5.2.4

Weigh

the crucible with contents to the nearest milli-

gram.

5.2

Calculation

The

resin content of the prepreg is calcu-

lated as follows:

Resin content (%) = Loss of Weight of Specimen x 100

Original

Weight of Specimen

5.3

Report

The

results shall be recorded in a report indicat-

ing resin content percent for each specimen and the average

of all specimens of the same materials.

6.0 Notes

6.1

Reinforcements

used for prepreg covered by this test

method may be woven or nonwoven, and continuous or non-

continuous fibers, any of which are referred to as fabrics.

6.2

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.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.16

Subject

Resin

Content of Prepreg, by Burn-off

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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1.0

Scope

This

method is designed to determine the resin

content of a prepreg without removing the resin from the rein-

forcement. The basis weight of the fabric must be known. This

method is applicable to both organic and inorganic reinforce-

ments.

Note: For referee testing of prepregs with inorganic reinforce-

ment, Method 2.3.16 shall be used.

2.0

Applicable Documents

IPC-EG-140

Specification

for Finished Fabric Woven from

‘‘E’’ Glass for Printed Boards

IPC-SG-141

Specification

for Finished Fabric Woven from

‘‘S’’ Glass

IPC-A-142

Specification

for Finished Fabric Woven from Ara-

mid for Printed Boards

IPC-QF-143

Specification

for Finished Fabric Woven from

Quartz (Pure Fused Silica) for Printed Boards

IPC-TM-650

Method

2.1.6.1, Weight of Fabric Reinforcements

Method 2.3.17, Resin Flow Percent of Prepreg

Method 2.3.19, Volatile Content of Prepreg Materials

3.0

Test Specimens

3.1 Size

Specimens

shall be 101.6 mm x 101.6 mm [4.0 in

x 4.0 in]. If the reinforcement is a continuous fiber woven fab-

ric, the sides shall be cut on a bias to the orientation of the

fabric.

3.2

Quality and Sampling

Unless

otherwise specified,

three specimens shall be taken equally spaced across the

width (web) of a roll or from different locations in a predeter-

mined quantity of paneled prepreg, such as an inspection lot.

If specimens are to be used for Resin Flow Percent (TM

2.3.17), then four specimens shall be used, cut from adjacent

points in a roll or cut panels (see 6.4).

4.0

Apparatus or Material

4.1

Analytical

balance, capable of weighing to the nearest

milligram (0.001 gram).

4.2

Static

shield (a thin piece of metal, e.g., 7 oz./sq. ft.

copper foil 5 inx5in(127 mm x 127 mm) or larger). This is

not needed if the balance pan is larger than the specimen.

4.3 Sample

cutting apparatus—die cut press, or equivalent,

capable of cutting specimens to the specified size.

4.4

Desiccator

capable of maintaining an atmosphere less

than 30% R.H. at 23°C [73°F].

Note: Do not use vacuum or other means which would be

capable of removing solvent or resin fractions.

5.0

Procedure

5.1 Preconditioning

Unless

the prepreg is tested within 10

minutes of production the specimen shall be desiccated for a

minimum of 4 hours. For referee testing, the specimens shall

be desiccated.

5.2

Test Conditions

The

test shall be performed at stan-

dard laboratory conditions. For materials which absorb mois-

ture rapidly, care should be taken to insure that moisture con-

tent is not significant by measurement immediately after

removal from desiccation.

5.3

Measurement

5.3.1

Place

the static shield on the balance pan.

5.3.2

Zero

the balance.

5.3.3 If

applicable, remove the specimens from the desicca-

tor. Place the specimens together on the balance, insuring

that they sit entirely on the balance pan, or the static shield if

needed (see 6.4).

5.3.4

Determine

and record the weight of the specimens to

the nearest 0.1g. For prepregs of nominal 0.15 mm [0.006 in]

thickness and less, weigh to the nearest 0.001g.

5.4

Calculations

5.4.1

Determine

the basis weight of the fabric using one of

the methods of Appendix A.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.16.1

Subject

Resin

Content of Prepreg, by Treated Weight

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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5.4.2

Calculate

the Resin Content (RC) of the material from

the treated weight (TW) and the basis weight (BW) of the fab-

ric for 41,290 mm

[64

The basis weight may be deter-

mined by any suitable method in Appendix A.

(

1−

)

x 100

where:

RC = Resin Content in %

BW = weight of the fabric as determined in accordance

with Appendix A

TW = treated weight from 5.3.4.

5.5

Report

5.5.1

Report

the Resin Content to the nearest .1%.

5.5.2

Report

the method used to determine the basis

weight of the reinforcement.

5.5.3

Report

any anomalies in the test or any variations from

the specified procedures or tolerances

6.0

Notes

6.1

The

solvent or volatile content of the prepreg (excluding

moisture) is considered part of the treated weight using this

method. If it is desired to exclude solvent content, the speci-

men should be vacuumed for an appropriate time and tem-

perature.

6.2

The

accuracy of this method for determination of resin

content is dependent primarily upon the accuracy of the basis

weight and the consistency of the reinforcement.

6.3.

The

effect of static charges may present a serious prob-

lem in weighing material which has been stored if the sample

is larger than the sample pan.

6.4

it is desired to check variation across the web the indi-

vidual specimens may be weighed separately or 4 specimens

may be cut down the web at each location to be tested.

6.5

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.

Appendix

Determination of Basis Weight of Reinforcement

All

the

following methods consider any finishes applied to the fabric

as part of the fabric. In most cases, the level of organic mate-

rial is negligible; however, special considerations have to be

made for material such as greige goods, which have substan-

tial amount of organic (5% or more), and for organic fabrics

which may have significant moisture content.

Methods shown are based on four specimens, with a total

area of 41,290 mm

[64.0

Method

Determine

the Basis Weight from the actual

length, width and weight of the roll.

BW = 806.4 WR

LxW

= Basis Wt in g

WR = Roll weight in lb.

L = Roll length in yds.

W = Roll width in in.

Method

Determine

the Basis Weight from median statisti-

cal or typical fabric weight in oz/yd

= 1.40 W

BW = Basis wt in g

W = Weight of 1 yd

oz.

Method

Determine

the Basis Weight from the actual fab-

ric weight at the beginning of the roll, using Method 2.1.6.1.

Method

Determine

the Basis Weight from the reported

weight supplied by the manufacturer.

BW = 1.40W

BW = Basis Wt in g

W = Weight of 1 yd

Method

Determine

the Basis Weight by consulting the unit

weight tables in the applicable documents; see 2.0.

IPC-TM-650

Number

2.3.16.1

Subject

Resin

Content of Prepreg, by Treated Weight

Date

12/94

Revision

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