IPC-TM-650 EN 2022 试验方法.pdf - 第243页

1 Scope This test method is designed to determine the resistance of the conformal coating to cracking and crazing when the coating is exposed to flexing. 2 Applicable Documents IPC-CC-830 Qualification and Performance of…

5.2

Measurement

5.2.1

Set

tester for the required span and crosshead verti-

cal speeds, as specified in Table 1.

5.2.2

Align

the loading nose and supports so that the axis of

the cylindrical surfaces are parallel, and the loading nose is

midway between the supports.

5.2.3

Condition

specimens within the test chamber, for one

hour at the temperature specified (see Table 2, or the appli-

cable specification).

5.2.4

Center

the specimen on the supports with the long

axis of the specimen perpendicular to the loading nose and

supports and stabilize for 2 minutes at temperature.

5.2.5

Apply

the load at the speed of testing from Table 1

until the specimen breaks. The load at breakage shall be

recorded in pounds (P).

5.3

Calculation and Report

5.3.1

Calculate

the flexural strength for each specimen

using the formula below:

S = 3PL

2bd

= Flexural strength in Psi

P = Load at breakage (pounds)

L = Span, inch

b = Width of specimen

d = Thickness

5.3.2

Average

the flexural strengths and record in psi.

5.3.3

The

specimen thicknesses, average Psi, and test tem-

perature shall be reported.

6.0 Notes

None

6.1

Additional

information and background useful to the per-

formance of the test may be found in ASTM-D-790.

able 2

Resin

Type Thickness Test Temperature

Difunctional,

tetrafunctional epoxies ALL 125°C

Hot Strength Retention Epoxies

High Temperature Epoxies

Up to 1.6 mm [0.063 inch]

1.6 mm [0.063 inch] and over

190°C

170°C

BT- epoxies

Modiﬁed epoxies

ALL 170°C

Polyimide of T

greater

than 250°C

ALL

204°C

Polyimides of T

less

than or equal to 250°C

ALL

170°C

Cyanate Esters ALL 204°C

measured

by IPC-TM-650, Test Method 2.4.25

IPC-TM-650

Number

2.4.4.1

Subject

Flexural

Strength of Laminates (at Elevated Temperature)

Date

12/94

Revision

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Scope

This

test method is designed to determine the

resistance of the conformal coating to cracking and crazing

when the coating is exposed to flexing.

Applicable Documents

IPC-CC-830

Qualification

and Performance of Electrical Insu-

lating Compound for Printed Board Assemblies

FED-STD-141 Method

2012

Test Specimens

3.1

Four

tin panels in accordance with FED-STD-141,

Method 2012. Electroplated tin is also acceptable.

Apparatus

4.1

Tin

panels coated with conformal coating according to

the coating supplier’s recommendations.

4.2

Mandrel,

0.3 cm [0.12 in] diameter

4.3

Magnifying

apparatus, capable of supplying 10X magni-

fication

Procedure

5.1

Place

the tin panel on a flat surface.

5.1.1

Place

the 0.3 cm [0.12 in] mandrel, in a stationary

position, in the center of the test panel.

5.1.2

Select

one end of the test panel and within one sec-

ond bend the panel 180° over the mandrel.

5.2

Evaluation

5.2.1

Following

the folding procedure, the test panel shall

then be examined with 10X magnification for cracking and

crazing.

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.5.1

Subject

Flexibility

- Conformal Coating

Date

07/00

Revision

Originating Task Group

Conformal Coating Task Group (5-33a)

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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ASSOCIA

TION CONNECTING

ELECTRONICS INDUSTRIES

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1.0

Scope

The

determination of lamination bond quality by

immersion in an oil stabilizing high temperature bath.

2.0

Applicable Documents

None

3.0

Test Specimen

Use

each of the four IPC test pattern

specimens H in Figures 1 through 7 shown in part 5.8.3 of this

publication. Any other sample of the production boards may

be used by mutual agreement between the vendor and the

customer.

4.0

Apparatus

4.1 Test Oil

Commercial

grade oil having a boiling and

flash point higher than 300°C (572°F).

4.2

Container

Heating

container capable of heating oil to

300° ± 10°C (572°F).

4.3

Stopwatch

4.4 Chamber

Circulating

air chamber capable of attaining

200°C (392°F).

5.0

Procedure

5.1 Preparation

5.1.1

Saw

the four coupons from specimen H. Do not cut

coupons so as to introduce any shearing, bending, or break-

ing stresses.

5.1.2 Condition

specimens by suspending in a circulating

chamber at 135° ± 15°C for one hour.

5.2

Test

5.2.1

Specimens

must be tested within two minutes after

removal from the chamber to preclude ambient moisture from

returning to specimens before flotation.

5.2.2

Remove

the specimens one at a time and float on the

surface of the hot oil bath, preset at 260° +6° –3° for 20 sec-

onds +1 –0 seconds.

5.2.3

After

removal from the hot oil and cooling, immerse

specimens in chlorethene-NU or trichlorethylene for a few

seconds, then dry with compressed air.

5.2.4

Rinse

in clean isopropyl alcohol and again blow dry

before examination.

5.3

Evaluation

Examine

each specimen for measling, blis-

tering or delamination.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.6

Subject

Hot

Oil

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.

age1of1

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