IPC-TM-650 EN 2022 试验方法.pdf - 第217页

Analyzing conditions depends on the test devices, test speci- mens, their composition and environment. 5.3 Calculation of Halogen Content Insert the concentra- tion of halogen ion (Cl - /Br - ) obtained in 5.2 in the fol…

Leave the flask at room temperature for 30 min ± 2 min after

combustion. The generated gas is absorbed into the alkali

solution to produce Cl

/Br

ion solution.

Transfer the solution from the combustion flask to a volumet-

ric flask. Introduce deionized water in the flask until the total

amount is 100 ml of the test solution.

Remove the suspended subjects from the test solution by fil-

tration or centrifugation if necessary.

Follow the same procedure outlined above without the test

specimen to prepare a reference test solution (blank) without

combustion of a test sample.

Note: Chlorine and bromine contents shall be measured

beforehand without any test specimen in the combustion

flask.

5.2 Chemical Analysis Inject the test fluid gathered from

the flask in 5.1 into the inlet of an ion exchange chromato-

graph shown in Figure 2.

Analyze the peak area/height of the Cl

/Br

conductivity on the

recorder and obtain Cl

/Br

concentration from a calibration

curve.

Obtain Cl

/Br

ion concentrations of the reference by compar-

ing its conductivity using the standard solution. The test

solution is compared to the reference solution (blank). Any

contaminant in the reference solution will be subtracted from

the test solution.

Titrate test solution using silver nitrate if concentration of Cl

ions is higher than 1 wt%. An example of analyzing condi-

tions for the ion exchange chromatography is given in Table 1.

IPC-2341-1

Figure 1 Absorb Combustion Gas Using a Combustion

Flask

Alkali solution

as absorbent

Platinum basket

(Test piece, filter

as fuse)

Fire

Combustion

flask (or

equivalents)

IPC-2341-2

Figure 2 Composition of Ion Exchange Chromatograph

Recorder

Waste

Fluid

Waste

Fluid

Conductivity

Detector

Suppressor

Separation

Column

Precolumn

Elimination Fluid

Delivering Pump

Elimination

Fluid

Inlet

Eluant

Delivering

Pump

Table 1 Example of Analyzing Conditions

for the Ion Exchange Chromatography

Item/Material Deﬁnition/Quantity

Eluant Alkali solution

Eluant delivering rate 1.0 ml/min to 2.0 ml/min

Elimination fluid H

Elimination fluid and delivering rate 1.0 ml/min to 2.0 ml/min

Column Precolumn,

separation column

Suppressor Suppression for anion

Detector Conductivity meter

IPC-TM-650

Number

2.3.41

Subject

Test Method for Total Halogen Content in Base Materials

Date

04/06

Revision

Page2of3

Analyzing conditions depends on the test devices, test speci-

mens, their composition and environment.

5.3 Calculation of Halogen Content Insert the concentra-

tion of halogen ion (Cl

/Br

) obtained in 5.2 in the following for-

mula to obtain halogen contents in the specimens:

Chlorine (wt%) =

{[Cl

concentration in the test fluid (ppm) x

Dilution ratio in the fluid] -

[Cl

concentration in the reference (ppm) x

Dilution ratio in the reference]} x

{quantity of test solution (ml) /

mass of the test specimen} x 10

-7

Note: For the bromine content, use the same equation but

insert Br

values in the place of Cl

Note: The dilution ratio is the amount of added water as com-

pared to the total amount of solution in the test flask. If the

amounts used were 50 ml each, the dilution ratio would be 2.

6 Report In addition to the general requirements for report-

ing, the report shall include:

a. Test method number and revision.

b. Date of the test.

c. Identification and description of the specimen.

d. Average chloride content of the five (5) specimens in ppm.

e. Average bromide content of the five (5) specimens in ppm.

f. Average total halogen content of the five (5) specimens in

ppm.

g. Any deviation from this test method.

h. Date of the test.

i. Name of the person conducting the test.

IPC-TM-650

Number

2.3.41

Subject

Test Method for Total Halogen Content in Base Materials

Date

04/06

Revision

Page3of3

1 Scope This test method is used to determine the ability of

a solder mask to resist degradation by solvents and cleaning

agents.

2 Applicable Documents

IPC-SM-840

Qualification and Performance of Permanent

Solder Mask

IPC-A-25A-G-KIT

Multipurpose One-Sided Test Pattern

3 Test Specimens Six (6) IPC-B-25A boards coated with

solder mask on the top side. Five are to be tested and one is

to be held as a control.

The IPC-A-25A-G-KIT artwork package provides the Gerber

files necessary for the fabrication of the standard IPC-B-25A

test board used with this test method.

4 Apparatus and Reagents

4.1

Reagent Grade 2-Propanol (Isopropyl Alcohol)

4.2 Deionized Water (DI Water) with resistivity ≥2MΩ-cm

and ≤10 MΩ-cm

4.3 10% Alkaline Detergent [by volume], which shall be

comprised of

• 5% alkanolamine

• 2.5% 2-butoxyethanol

• 2.5% glycol ether

• 90% DI Water

4.4 Monoethanolamine

4.5 Miscellaneous laboratory-ware (e.g., beakers, funnels,

storage bottles, graduated cylinders) including:

1) A hot plate capable of heating up to 65 °C [149 °F]

2) A thermometer capable of measuring accurately up to 100

°C [212 °F]

3) A vent hood, or performed with adequate ventilation

4.6 Thermometer with measurement uncertainty less than 2

°C [3.6 °F] and precision better than 1 °C [1.8 °F].

5 Procedures

5.1 Chemical Exposure

5.1.1

Prepare the solvents and cleaning agents as outlined

in Section 4 and Table 1.

5.1.2 Completely immerse one test specimen in each of the

solutions shown in Table 1. A new specimen is to be used for

each chemical.

5.1.3 After immersion, hang the specimens to dry for ten

minutes at ambient laboratory conditions.

5.2 Visual Examination

5.2.1

Visually examine each printed board with corrected

20/20 vision without magnification for delamination or surface

degradation such as cracks, tackiness, blisters or swelling of

the solder mask.

6 Notes

6.1 Safety

Operator should be trained and familiar with the

hazards inherent to the chemicals being used and analyzed.

Proper personal safety equipment, such as safety glasses,

gloves and splash apron, and adequate ventilation shall be

used.

1. www.ipc.org/onlinestore

Table 1 Exposure of Solder Mask

to Solvents/Cleaning Agents

Solvent/

Cleaning Agent

Temperature

(°C) [°F]

Time

(Minutes)

Isopropanol

Ambient

Laboratory Conditions

75% isopropanol/

25% deionized water

46±2°C[115 ± 3.6 °F] 15

10% Alkaline detergent 57±2°C[135 ± °F] 2

Monoethanolamine 57±2°C[135 ± °F] 2

Deionized water 60±2°C[140 ± °F] 5

D-Limonene

Ambient

Laboratory Conditions

Note: Record the ambient temperature and temperature measurement

uncertainty in °C.

3000 Lakeside Drive, Suite 309S

Bannockburn, IL 60015-1219

IPC-TM-650

TEST METHODS MANUAL

Number

2.3.42

Subject

Solder Mask - Resistance to Solvents and

Cleaning Agents

Date

03/07

Revision

Originating Task Group

Solder Mask Performance Task Group (5-33b)

Material in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.

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