IPC-TM-650 EN 2022 试验方法.pdf - 第139页

Solder Mask Color V endor Lot Coated Thickness − Nm Min: Max: Laminate (ANSI type) Color V endor Lot Substrate Thickness − (mm) Min: Max: Solder Shock Parameters T ime (seconds) T emperature °C Check One Actual Solder Fl…

Calculation of the total specimen burning time or the aver-

age specimen burning time as applicable based on 10 igni-

tions per set of five specimens (see Figure 3)

g. Calculation of the glowing time for each specimen if

required by the specification

5.6

Evaluation and Reporting

The

material shall be con-

sidered to be out of compliance with the specification if:

a. More than one specimen per set burns up to the holding

clamp on any ignition

b. More than one specimen per set burns for a period of time

longer than allowed by the specification for a single speci-

men

c. The total specimen burning time as applicable exceeds the

maximum allowed by the specification and is beyond the

tolerance specified in 5.6.2

d. More than one specimen glows for a period of time greater

than allowed by the specification (when applicable)

e. More than one specimen drips flaming particles, which

ignite the dry absorbent surgical cotton

5.6.2

Reporting

Each

test condition is reported separately.

The parameters outlined in 5.6 are to be reported only as

applicable.

5.6.3

Retests

only one specimen per set (five) fails to

comply with the requirements, the reserve set of specimen

shall be tested. In the case of total and/or average specimen

burning time, the reserve set shall be tested only if these cal-

culated values exceed the specification maximum by five sec-

onds or less. All specimens, their total, and their average from

the reserve set shall comply with the requirements.

6 Notes

6.1

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,

resulting in a false yellow flame tip. Proper flame adjustments

then become very difficult if allowed to remain.

6.2

When

the flame is correct and the specimen’s end is at

the proper height above the burner (9.5 mm), the inner blue

cone of the flame will just meet the end of the specimen. The

hottest area of the flame will then ignite the specimen.

6.3

Accurate

centering of the flame under the specimen is

essential for consistent test results.

IPC-23101-2

Figure

2 Specimen Mounted in the Test Fixture

Specimen

9.5 mm

19 mm

304 mm

y absorbant

surgical cotton

Mounting

Block

Burner

IPC-TM-650

Number

2.3.10.1

Subject

Flammability

of Soldermask on Printed Wiring Laminate

Date

8/98

Revision

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Solder

Mask

Color

endor

Lot

Coated Thickness−Nm

Min: Max:

Laminate (ANSI type)

Color

endor

Lot

Substrate Thickness−(mm)

Min: Max:

Solder

Shock Parameters

Time (seconds)

emperature

°C

Check

One

Actual Solder

Fluidized

Alumina

Conditioning: ≥48

Hours @ 23°C ± 2°C & 50% ± 5% RH

Specimen

Number

Total

Thickness

Time of Combustion or Combustion & Glowing

Total

Flaming

Time/ea.

Total

Flaming

& Glowing

Within (W) or

Exceeds (E)

Spec. Limits

1st Flame Appli. 2nd Flame Application

Flame (sec.) Flame (sec.) Glowing (sec.)

Conditioning:

168 ± 2 Hours @ 70°C ± 1°C Desiccator Cooled

Specimen

Number

Total

Thickness

Time of Combustion or Combustion & Glowing

Total

Flaming

Time/ea.

Total

Flaming

& Glowing

Within (W) or

Exceeds (E)

Spec. Limits

1st Flame Appli. 2nd Flame Application

Flame (sec.) Flame (sec.) Glowing (sec.)

Figure

3 Vertical Burn Flammability Data

IPC-TM-650

Number

2.3.10.1

Subject

Flammability

of Soldermask on Printed Wiring Laminate

Date

8/98

Revision

age4of4

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Scope

The

purpose of this test method is to provide a

procedure for examining glass fabric to determine its con-

struction, including its weight, thickness, strength, and type of

weave. Since this method may be used to examine glass fab-

ric used in PCB laminate and pre-impregnated ‘‘B’’ stage

glass fabric, the method provides a procedure for removing

any obscuring resin by a combustion process.

Applicable Documents

IPC-EG-140

Specification

for Finished Fabric Woven from

‘‘E’’ Glass for Printed Boards

Test Specimen

3.1

Three

pieces of material, 5 cmx5cm

Equipment/Apparatus

4.1

Muffle

furnace capable of maintaining 538°C ± 14°C

4.2 Analytical

balance capable of weighing to the nearest

milligram (0.001 g)

4.3 Micrometer

capable of measuring to the nearest 0.0025

4.4

Binocular

microscope, magnification to 30X

Procedure

5.1

minimum of three specimens of each test material

shall be tested by the following procedure: Place a specimen

in a crucible of suitable size and place in muffle furnace main-

tained at 538°C ± 14°C for 30 minutes. Remove from muffle

furnace and allow to cool.

5.2

Examine Residual Material

5.2.1

the residue shows any evidence of glass fusion,

repeat 5.1, but with the muffle furnace temperature main-

tained at 488°C ± 14°C. If there is evidence of glass fusion at

this lower temperature, again repeat the procedure of 5.1,

lowering the temperature in 50°C increments until there is no

evidence of glass fusion.

5.2.2

the residue shows evidence of incomplete removal

of resin, increase the temperature of the furnace by 50°C and

repeat 5.1.

5.2.3

After

the initial period and cooling to room tempera-

ture, the residual glass fabric must be white, free of resin resi-

due, and exhibit no evidence of glass fusion.

5.3

Thickness Measurement

Place

the glass fabric speci-

men between two flat plates and measure the thickness with

a micrometer. Remove the glass fabric specimen and mea-

sure the thickness of the two flat plates. The thickness of the

glass fabric shall be determined by subtracting the thickness

of the two flat plates without the glass fabric from the mea-

surement obtained with the glass fabric between the plates.

The thickness of at least three specimens shall be measured

and recorded. The thickness of each specimen shall be deter-

mined as the average of five separate measurements.

5.4

Glass Fabric Weight

5.4.1

The

length and width dimensions of the glass fabric

specimens shall be measured to the nearest 0.25 mm.

5.4.2

The

weight of the specimen shall be determined using

the analytical balance and weighing to the nearest milligram.

5.4.3

The

weight of the glass fabric shall be determined

using IPC-EG-140.

5.5

Fabric Construction

The

number of yarns in the warp

and fill used in constructing the fabric shall be determined by

counting a 2.5 sq. cm area of the fabric using a microscope.

5.6 All

other properties in Table 1 shall be as specified in the

procurement document.

5.7

Report

The

results of testing glass fabric by this test

method shall be reported in a written report, which (as a mini-

mum) contains the following:

1. Certification that the test was performed in accordance

with this test method

2. Identification of the specimens tested

3. Dimensions of each specimen (length and width)

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.11

Subject

Glass

Fabric Construction

Date

4/73

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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