IPC-TM-650 EN 2022 试验方法.pdf - 第152页

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 2 [64 in 2 ]. The basis weight may be deter- mined by any suitable method in App…

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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1.0

Scope

This

method is designed for determining the

treated weight of a specific area of prepreg. Treated weight is

an alternative to Resin Content Percent as a means of deter-

mining the usability and functionality of prepreg. This method

is applicable to both organic and inorganic reinforcements but

effective use of this technique requires knowledge of resin and

reinforcement specific gravity, as well as basis weight of the

reinforcement.

2.0

Applicable Documents

IPC-EG-140

Specification

for Finished Fabric Woven From

‘‘E’’ Glass for Printed Board

IPC-SG-141

Specification

for Finished Fabric Woven From

‘‘S’’ Glass

IPC-A-142

Specification

for Finished Fabric Woven From

Aramid for Printed Boards

IPC-QF-143

Specification

for Finished Fabric Woven From

Quartz (Pure Fused Silica) for Printed Boards

IPC-TM-650

Method

2.4.38, Prepreg Scaled Flow Testing

Method 2.3.16, Resin Content of Prepreg by Burn-off

3.0

Test Specimens

3.1 Size

The

prepreg specimen shall be two or more die

cut plies. Each ply shall be 140 ± 0.25 mm [5.5 ± 0.01 in] by

178 ± 0.25 mm [7.0 ± 0.01 in]. Use of the specimen for scaled

flow test (IPC-TM-650, Method 2.4.38) is recommended. See

2.4.38 for additional criteria.

Alternate specimen sizes such as 102 mm x 102 mm [4 in x

4 in] or 457 mm x 610 mm [18 in x 24 in] are acceptable by

agreement between supplier and user.

3.2

Quantity and Sampling

Unless

otherwise specified,

three specimens shall be taken from the lot at randomly

selected locations, whether taken from a roll or from precut

panels. Specimens shall be taken from the fabric roll (as sup-

plied by the manufacturer) no closer to the selvage (or cut

edge) than a distance equal to one-tenth of the width of the

roll.

4.0

Apparatus or Material

4.1

Analytical

balance capable of weighing to the nearest

0.001g.

4.2

Static

shield (a thin piece of metal, e.g., 7 oz copper foil

at least 25.4 mm [1.0 in] larger in length and width than the

prepreg specimen). This is not required if the balance pan is

larger than the specimen.

4.3

Sample

cutting press with die 140 ± 0.25 mm x 178 ±

0.25 mm [5.50 ± 0.01 in x 7.00 ± 0.01 in].

4.4

Kraft

paper or equivalent back up material for cutting

press.

4.5

Desiccator

capable of maintaining 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 and configu-

ration, see 3.1.

5.1.2

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

Equipment Setup

Place

the static shield on the bal-

ance pan and zero the balance.

5.4 Measurement

5.4.1

Place

each specimen on the balance, ensuring that it

sits entirely on the static shield.

5.4.2 Determine

and record the treated weight of each speci-

men to the nearest 0.001g.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.16.2

Subject

Treated

Weight 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.

age1of2

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