IPC-TM-650 EN 2022 试验方法.pdf - 第247页

5.5.2 Apply sufficient force to the punch using the appara- tus in 4.6 to remove the section from the test specimen. 5.5.3 Use a permanent marker or vibrating scribe to serial- ize each resulting piece. 5.6 Visual Examin…

1 Scope This test method specifies techniques for the

determination of machineability of a solder mask.

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. Three are to be tested

as-received and three are to be tested after solder float expo-

sure.

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

information necessary for the fabrication of the standard IPC-

B-25A test board.

4 Apparatus and Reagents

4.1 Drill

4.1.1

Drill speed of 1500 ± 250 rpm

4.1.2 Drill bit size of 6.35 mm [0.25 in]

4.2 Router

4.2.1

Speed of 20,000 ± 5,000 rpm

4.2.2 Router bit to be standard for printed board fabrication

and operation at recommended speed. Bit must be sharp and

in good working order.

4.3 Band Saw

4.3.1

Speed of (442 ± 76) m/min [(1450 ± 250) ft/min]

4.3.2 Blade of 1.2 cm [0.5 in] width, 0.89 mm [0.035 in]

gauge, and 10-14 pitch

4.4 Punch

4.4.1

2.5 cm [1 in] square die

4.4.2 Clearance range between punch and die to be [0.001

to 0.003 in]

4.5 Permanent Marker and/or Vibrating Scribe

4.6 Hammer or Mechanical Punching Apparatus

5 Procedures

5.1 Preconditioning

5.1.1

Process three of the IPC-B-25A coupons per IPC-SM-

840, Resistance to Tin-Lead Solder - Solder Float

5.2 Drilling

5.2.1

Drill three holes in each coupon directly below the

label ‘‘B’’ on the test specimen.

5.3 Routing

5.3.1

Route a straight edge along the top side of each cou-

pon.

5.3.2 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.4 Sawing

5.4.1

Make a single cut along the bottom edge of each cou-

pon removing the finger tab area.

5.4.2 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.5 Punching

5.5.1

Place the punch over the fiducial above the comb pat-

tern labeled ‘‘F’’ on the test specimen.

1. www.ipc.org/onlinestore

3000 Lakeside Drive

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.4.7.1

Subject

Solder Mask - Determination of Machineability

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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ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

5.5.2 Apply sufficient force to the punch using the appara-

tus in 4.6 to remove the section from the test specimen.

5.5.3 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.6 Visual Examination

5.6.1

Visually examine each coupon and the extracted

pieces for evidence of tears or cracks 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.

IPC-TM-650

Number

2.4.7.1

Subject

Solder Mask - Determination of Machineability

Date

03/07

Revision

Page2of2

1.0

Scope

This

test method is designed to determine the

peel strength of metallic cladding when tested in the following

conditions, ‘‘as received,’’ after thermal stress, and after

exposure to processing chemicals; and to evaluate the base

laminate material after the peel strength test is completed for

degradation due to the conditioning.

2.0

Applicable Documents

IPC-TM-650

Method

2.4.8.1, Peel Strength, Metal Foil (Keyhole Method for

Thin Laminates)

Method 5.8.3, Peel Strength Test Pattern

3.0

Test Specimens

3.1 Size and Configuration

Specimens

shall be 50.8 mm

x 50.8 mm [2.0 x 2.0 in] by the thickness of the laminate.

Cladding test strips shall be as specified (see 5.1.2).

3.2

Quantity and Sampling

least 2 specimens per clad

side per each test condition (see 5.2) shall be taken at random

from the laminate lot. They may be taken from samples used

for other QA testing or inspection. One specimen per side

shall be used for crosswise and one specimen per side for

lengthwise testing.

4.0

Apparatus or Material

4.1 Tensile Tester

tensile strength tester equipped with

a load cell, capable of measuring to the nearest 0.0045 kg

[0.01 lbs], and light load wire or chain and clamp at least 457

mm [18.0 in] long (its weight is included in the load cell calcu-

lation). The clamp jaws must cover the entire width of each

peel strip. Any equipment or apparatus having the described

accuracy, precision, and reproducibility may be used.

4.2

Solder Pot

solder bath or pot capable of maintaining

solder at the specified temperature when measured 25.4 mm

[1.0 in] below the surface. Type Sn60 or Sn63 solder shall be

used.

4.3

Specimen Hold-down

suitable hold-down clamping

system equivalent in performance as that defined in IPC-TM-

650, Method 2.4.8.1.

4.4

Chemicals

minimum of two ounces of the following

processing solutions:

4.4.1

Organic

chemical stripper, such as Methylene Chlo-

ride, or equivalent

4.4.2

Sodium

Hydroxide 10 gr/liter

4.4.3

Boric

Acid 30 gr/liter and Sulfuric Acid 10 gr/liter

4.4.4

Organic

degreaser, such as isopropyl alcohol, or

equivalent.

4.5

Hot

fluid bath, capable of being maintained at the speci-

fied temperature, when measured 25.4 mm [1.0 in] below the

surface.

4.5.1

Dow

Silicone Fluid No. 704, or equivalent.

4.6

Dow

Silicone Grease, Compound 4, or equivalent.

4.7

Data Collection

For

qualification testing, a recording

system capable of permanent data retention must be incorpo-

rated into the test apparatus.

4.8

Etching

system capable of complete removal of metallic

cladding.

4.9

Measuring

device capable of measuring from 0.000 to

12.7 mm [0.5 in] to within ± 0.0025 mm [0.0001 in].

4.10

Etch Resist Materials or Systems

4.10.1

Platers

tape, or equivalent, to act as etch resist for

strip formation of the specified widths (see 5.2.1.1, 5.2.2.1,

and 5.2.3.1).

4.10.2

Photoresist

system (printing, developing, and stripping).

5.0

Procedure

5.1 Specimen Preparation

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8

Subject

Peel

Strength of Metallic Clad Laminates

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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