IPC-TM-650 EN 2022 试验方法.pdf - 第358页

T able 2 Initial Stackweight (Wo, grams) vs. Calculated Initial Thickness (ho, mils) 104 106 108 112 113 116 7628 Wo ho Wo h o Wo ho Wo h o Wo ho Wo h o Wo ho 20 1.03 25 1.28 40 1.95 35 3.13 35 2.97 45 3.82 80 6.71 21 1.…

4.7

Unless

otherwise specified, press the specimen with a

force of 840 lb (31.0 psi) ± 5% for 10 minutes minimum. Full

force is to be applied within 15 seconds after sample is placed

on the press plate.

4.8

Carefully

remove the hot specimen from the press, flip

over onto a smooth flat surface and cool for 5 minutes or to a

rigid state before making measurements.

4.9

Remove

release material from stack. Using the template

shown in Figure 2, mark the points to be measured. Cut the

stack when required to facilitate measuring the specific points

along the cut line shown in Figure 2.

5.0

Test Results

5.1

Measure

the thickness to the nearest 0.0001 inch with a

micrometer at the three intervals defined by the template.

Record all three measurements for each test specimen. If

there is a thickness variation between the three measure-

ments of 0.003 inches or more, the test must be repeated.

Average the three measurements to determine final measured

thickness.

5.2

Use

the initial weight, WO, to determine the initial thick-

ness (Ho) either from the formula in Appendix or from Table 2.

5.3

Final

thickness per ply can be calculated by dividing the

final measured thickness by the number of plies. Initial thick-

ness and final thickness can be used to calculate thickness

change.

Appendix

Determination

of Initial Thickness: (See Table 2)

ho =

(5.54

x 10

−2

)−

2.12

x 10

−2

Where:

= Initial thickness per ply (mils)

Wo = Initial stack weight (g)

Wg = Unit glass weight (g/in2)

n = Number of plies

Unit Glass Weights: (Approximated from test results)

Style

104

106

108/1080

112/2112

113/2113

116/2116

7628

Weight (g/in2)

0.0128

0.0164

0.0311

0.0464

0.0538

0.0691

0.1312

IPC-2438-1

Figure

IPC-2438-2

Figure

IPC-TM-650

Number

2.4.38

Subject

Prepreg

Scaled Flow Testing

Date

6/91

Revision

age2of3

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able 2 Initial Stackweight (Wo, grams) vs. Calculated Initial Thickness (ho, mils)

104

106 108 112 113 116 7628

Wo ho Wo ho Wo ho Wo ho Wo ho Wo ho Wo ho

20 1.03 25 1.28 40 1.95 35 3.13 35 2.97 45 3.82 80 6.71

21 1.10 26 1.35 41 2.02 36 3.24 36 3.09 46 3.94 81 6.73

22 1.16 27 1.41 42 2.08 37 3.36 37 3.21 47 4.06 82 6.85

23 1.23 28 1.48 43 2.15 38 3.48 38 3.32 48 4.17 83 6.97

24 1.29 29 1.54 44 2.21 39 3.60 39 3.44 59 4.29 84 7.08

25 1.36 30 1.61 45 2.28 40 3.71 40 3.56 50 4.41 85 7.20

26 1.43 31 1.68 46 2.34 41 3.83 41 3.67 51 4.52 86 7.32

27 1.49 32 1.74 47 2.41 42 3.95 42 3.79 52 4.64 87 7.44

28 1.56 33 1.81 48 2.47 43 4.07 43 3.91 53 4.76 88 7.55

29 1.62 34 1.87 49 2.54 44 4.18 44 4.03 54 4.88 89 7.67

30 1.69 35 1.94 50 2.60 45 4.30 45 4.14 55 4.99 90 7.79

31 1.75 36 2.00 51 2.67 46 4.42 46 4.26 56 5.11 91 7.91

32 1.82 37 2.07 52 2.73 47 4.54 47 4.38 57 5.23 92 8.02

33 1.88 38 2.13 53 2.80 48 4.65 48 4.50 58 5.35 93 8.14

34 1.95 39 2.20 54 2.86 49 4.77 49 4.61 59 5.46 94 8.26

35 2.01 40 2.26 55 2.93 50 4.89 50 4.73 60 5.58 95 8.38

36 2.08 41 2.33 56 2.99 51 5.01 51 4.85 61 5.70 96 8.49

37 2.14 42 2.39 57 3.06 52 5.12 52 4.97 62 5.82 97 8.61

38 2.21 43 2.46 58 3.13 53 5.24 53 5.08 63 5.95 98 8.73

39 2.27 44 2.52 59 3.19 54 5.36 54 5.20 64 6.05 99 8.85

40 2.34 45 2.59 60 3.26 55 5.48 55 5.32 65 6.17 100 8.96

41 2.40 46 2.65 61 3.32 56 5.59 56 5.44 66 6.29 101 9.08

42 2.47 47 2.72 62 3.39 57 5.71 57 5.55 67 6.40 102 9.20

43 2.53 58 2.78 63 3.45 58 5.83 58 5.67 68 6.52 103 9.32

44 2.60 59 2.85 64 3.52 59 5.95 59 5.79 69 6.64 104 9.43

45 2.66 50 2.91 65 3.58 60 6.06 60 5.91 70 6.76 105 9.55

Wo = grams, ho = mils; (n) for 104, 106, 108 = 18; (n) for 112, 113, 116 7628 = 10

Reference Documents

1. Journal of Elastomers and Plastics, 10,367 (1978), C.J. Bartlett

2. Journal of Elastomers and Plastics, 10,365 (1978) D.P. Bloechle

3. IPC-TP-281, The Use of Scaled Flow Testing for B-Stage Prepreg, C.J. Bartlett, D.P. Bloechle, W.A. Mazeika

4. IPC-TP-418, Application of Scaled Flow Testing as an Incoming Inspection Criteria, H.J. Brown

5. IPC-TP-420, Scaled Flow for Testing CRC Prepreg, J. Del, P. Marx, J. Sallo

6. D.P. Bloechle, ‘‘Epoxy Prepreg Characterization using Scaled Flow Testing Techniques,’’ Circuit World, 9,1 (1982), p.8

IPC-TM-650

Number

2.4.38

Subject

Prepreg

Scaled Flow Testing

Date

6/91

Revision

age3of3

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1.0

Scope

This

procedure defines a test method used to

determine dimensional stability of glass reinforced, copper-

clad, thin laminates intended for use in rigid multilayer printed

boards.

The test is appropriate for checking material consistency. It is

not intended for defining suitability of the raw material to be

used in a specific printed board product or process.

2.0

Applicable Documents

IPC-TR-483

‘‘Dimensional

Stability Testing of Thin Lami-

nates’’

3.0

Test Specimen

The

specimen shall be 300 mm x 280

mm [12 in x 11 in] in size with the warp direction in the 300

mm dimension. A minimum of three specimens is required per

inspection lot. When evaluating laminate sheets, specimens

should be taken from opposite diagonal corners and from the

center of the sheet. For precut panels three randomly selected

panels shall be used to obtain the test specimens.

4.0

Apparatus

4.1

The

measurement apparatus shall be capable of mea-

suring the specimen within an accuracy of 0.0125 mm

[0.0005 in], over 250 mm [10.0 in] dimension. (Supergauge, or

equivalent, may be used.)

4.2

Ovens

used for baking must be of the air circulating type

and capable of ± 2°C control. The recovery time of the tem-

perature must be less than 15 minutes after specimens are

placed in the oven.

4.3

stabilization chamber (drying cabinet) containing cal-

cium chloride or silica gel capable of maintaining less than 20

RH at 21 ± 2°C.

5.0

Test Procedure

5.1 Preparation of the Specimen

5.1.1

Mark

the specimen for traceability in the identification

area (see Figure 1). No mechanical or chemical pre-cleaning is

permitted on the specimen.

5.1.2

Prepare

the four location points (see Figure 1) by drill-

ing or scribing.

5.1.3

Measure

distances Fl, F2, W1, and W2 utilizing the

apparatus defined in paragraph 4.1. Define distances to the

nearest 2.5 microns [0.0001 in]; the last digit of the reading

may be estimated. Record all values as initial measurements.

5.1.3.1

optical measurement must be used, a rigid plate

shall maintain the test specimen in a flat and horizontal posi-

tion.

5.1.4

Place

a 12 mm [0.5 in] diameter tape dot over holes

or scribe marks on side of laminate to be measured and a

piece of 25 mm x 12 mm [1.0 in x 0.5 in] wide tape over iden-

tifying information.

IPC-2439-a

Figure

1 All dimensions are in inches. Four

measurements are required as indicated. Locate

measuring points approximately 12.7mm [0.500 in] from

each edge in the ﬁll direction, and 25.4 mm [1.00 in] from

each edge in the warp direction.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.39

Subject

Dimensional

Stability, Glass Reinforced Thin

Laminates

Date

2/86

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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