IPC-CC-830B.pdf - 第11页

3-1 are satisﬁed. T ests shall be performed in accordance with the test methods speciﬁed using test specimens pre- pared in compliance with 4.7 at a frequency deﬁned in 4.3.3. Pertinent results shall be compared with the…

2.4.5.1 Flexibility

2.5.7.1 Dielectric Withstanding Voltage - Polymeric

Conformal Coating

2.6.1.1 Fungus Resistance - Conformal Coating

2.6.3.4 Moisture and Insulation Resistance - Conformal

Coating

2.6.7.1 Thermal Shock - Conformal Coating

2.6.11.1 Hydrolytic Stability - Conformal Coating

IPC-4101 Speciﬁcation for Base Materials for Rigid and

Multilayer Printed Boards

IPC-6012 Sectional Standard for Qualiﬁcation of Rigid

Printed Boards

2.2 Government

MIL-I-46058 Insulating Compound, Electrical (For Coating

Printed Circuit Assemblies)

MIL-STD-1188 Commercial Packaging of Suppliers and

Equipment

FED-STD-141 Paint, Varnish, Lacquer and Related Materi-

als: Methods of Inspection, Sampling and Testing, Method

4061 and Method 2012

2.3 American Society for Testing of Materials

ASTM-D-1005 Measurement of Dry Film Thickness of

Organic Coatings

ASTM-D-1084 Viscosity of Adhesives, Tests for

2.4 Underwriters Laboratories

UL 94 Flammability

2.5 ANSI

NCSL Z540-1 Calibration Calibration Laboratories and

Measuring and Test Equipment

2.6 ISO

ISO 10012-1 Quality Assurance Requirements for Measur-

ing Equipment - Part 1: Metrological Conﬁrmation System

for Measuring Equipment

3 REQUIREMENTS

3.1 General Requirements

3.1.1 Terms and Definitions

Deﬁnitions of terminology

applicable to this standard shall be in accordance with IPC-

T-50.

3.1.2 Conflict In the event of a conﬂict between the

requirements of this standard and procurement document,

the procurement document shall take precedence. In the

event of a conﬂict between the test parameters of this stan-

dard and the test methods, or a conﬂict between the

requirements in this standard and the applicable documents

listed in Section 2, this standard shall take precedence.

3.2 Inspection and Testing Requirements Groups of

inspection and test listed in Table 3-1 shall be performed

to verify the ability of a conformal coating product to meet

the qualiﬁcation and/or conformance requirements of this

standard using the test methods described herein.

3.2.1 Qualification Inspection and Testing Qualiﬁca-

tion to this standard is achieved when a conformal coating

product meets the requirements listed in Column A of Table

3-1. Tests shall be performed in accordance with the test

methods speciﬁed using test specimens prepared in compli-

ance with 4.7. A qualiﬁcation inspection report shall be

completed in accordance with 4.9 and relevant test data

retained as substantiation for the qualiﬁcation. An example

of qualiﬁcation inspection report format is shown in

Appendix A.

When a primer material is used in conjuction with a coat-

ing in qualiﬁcation testing, the primer used will be docu-

mented in the qualiﬁcation report.

Conformal coatings presently qualiﬁed to MIL-I-46058

shall also be recognized as meeting the requirements of

IPC-CC-830. These products currently qualiﬁed or in the

process of being requaliﬁed to MIL-I-46058 prior to the

publish date of this document will also be recognized as

meeting the requirements of this document.

3.2.2 Qualification Retention Inspection and Testing

Qualiﬁcation to this standard can be retained when a con-

formal coating product meets the requirements listed in

Column B of Table 3-1. Tests shall be performed in accor-

dance with the test methods speciﬁed using test specimens

prepared in compliance with 4.7 at a frequency deﬁned in

4.3.2. Pertinent test results shall be compared with the

results of the original qualiﬁcation testing. An inspection

report shall be completed in accordance with 4.9 and rel-

evant test data retained as substantiation for the qualiﬁca-

tion retention. An example of the qualiﬁcation retention

inspection report format is shown in Appendix B.

3.2.3 Quality Conformance Inspection Testing The

consistency in quality of a conformal coating product is

veriﬁed when the requirements listed in Column C of Table

3. http://astimage.daps.dla.mil/quicksearch/

4. www.astm.org

5. www.ul.com

6. www.ansi.org

7. www.iso.org

IPC-CC-830B August 2002

Provided by IHS under license with IPC

Not for Resale

No reproduction or networking permitted without license from IHS

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3-1 are satisﬁed. Tests shall be performed in accordance

with the test methods speciﬁed using test specimens pre-

pared in compliance with 4.7 at a frequency deﬁned in

4.3.3. Pertinent results shall be compared with the results

of the original qualiﬁcation testing. An inspection report

shall be completed in accordance with 4.9 and relevant test

data retained as substantiation for the quality conformance.

An example of quality conformance inspection report is

shown in Appendix C.

Conformal coating quality conformance inspection is gen-

erally performed by the coating manufacturer, but may

with appropriate agreement be used as an incoming mate-

rial inspection procedure by the customers.

3.2.4 Additional Testing Additional testing on different

test vehicles, at different test frequency or conditions, or

for properties outside the scope of this standard may be

agreed upon between the manufacturers and the customers.

It shall not be used as a substitute for any testing require-

ment speciﬁed herein.

3.3 Materials Requirements

3.3.1 Materials

The conformal coating materials shall

be free of deleterious substances.

3.3.2 Shelf Life The conformal coating shall meet all

requirements of this standard within the shelf life and stor-

age conditions speciﬁed by the conformal coating manufac-

turer. Shelf life of coating with two or more components

shall be that of the component with the shortest shelf life.

The tests shall consist of Insulation Resistance (IR) and

Dielectric Withstanding Voltage (DWV).

3.3.3 Cure The conformal coating shall exhibit all

desired properties when applied and cured using the proce-

dures speciﬁed by the conformal coating manufacturer.

When coating materials are tested as speciﬁed, the coating

material shall be cured to full hardness in the time and

temperature recommended by the supplier.

3.4 Chemical Requirements

3.4.1 Fourier Transform Infrared Spectroscopy Test

(FTIR)

Fourier Transform Infrared Spectroscopy (FTIR)

test shall be performed in accordance with IPC-TM-650,

Test Method 2.3.42, or equivalent, as part of data gathering

for the conformal coating during qualiﬁcation inspection.

When used in qualiﬁcation retention inspection, FTIR

spectra shall be compared to those obtained during qualiﬁ-

cation inspection. Absorption peaks completely missing or

additional peaks signify change in chemistry present within

Table 3-1 Requirements for Qualiﬁcation, Qualiﬁcation Retention

and Quality Conformance of Conformal Coating Products

Paragraph Requirement Test Method

Column A Column B Column C

Qualiﬁcation

Retention of

Qualiﬁcation

Quality

Conformance

3.3.1 Materials Visual X X X

3.3.2 Shelf Life — X

3.3.3 Cure — X X X

3.4.1 Fourier Transform Infrared

Spectroscopy Test (FTIR)

IPC-TM-650

2.3.42

3.5.1 Viscosity ASTM D-1084 X X

3.5.2 Appearance Visual X X X

3.5.3 Fluorescence Visual under

UV light

XXX

3.5.4 Fungus Resistance IPC-TM-650

2.6.1.1

3.5.5 Flexibility IPC-TM-650

2.4.5.1

3.5.6 Flammability UL 94 HB X X

3.6.1 Dielectric Withstanding Voltage IPC-TM-650

2.5.7.1

3.7.1 Moisture and Insulation

Resistance

IPC-TM-650

2.6.3.4

X* X*

3.7.2 Thermal Shock IPC-TM-650

2.6.7.1

3.7.3 Temperature and Humidity

Aging (Hydrolytic Stability)

IPC-TM-650

2.6.11.1

Required for Class

B Products Only

X Denotes inspection and test required for all classes.

* Denotes requirement is different for Class A and Class B. See 3.7.1 for Class A and B requirements.

August 2002 IPC-CC-830B

Provided by IHS under license with IPC

Not for Resale

No reproduction or networking permitted without license from IHS

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the conformal coating product. A change in chemistry as

detected by FTIR may or may not constitute a product

change. See 4.4 for the deﬁnition of product change.

3.5 Physical Requirements

3.5.1 Viscosity

Viscosity of uncured conformal coating

materials, except type xy, shall be measured per ASTM

D-1084 and the test conditions shall be deﬁned by the

coating manufacturer. Viscosity shall be measured as part

of data gathering for the conformal coating during qualiﬁ-

cation inspection. This viscosity data shall be used by the

manufacturer to pre-determine an acceptable viscosity

range for quality conformance inspection.

3.5.2 Appearance Appearance of conformal coating on

the test vehicle speciﬁed herein shall be observed visually

with the aid of a 3-diopter (approximately 1.75x) minimum

magniﬁcation. Referee inspections shall be accomplished

at 10x magniﬁcation.

The uncured conformal coating materials shall be free of

deleterious substances, bubbles, pinholes, whitish spots,

blistering, wrinkling, cracking, and peeling. The cured con-

formal coating shall be smooth, homogenous, transparent

or translucent, and tack-free when observed at ambient

conditions. In addition, the conformal coating on the test

vehicles shall have no bubbles, pinholes, blisters, cracking,

crazing, peeling, wrinkles, mealing, or evidence of rever-

sion, or cause a corrosion.

3.5.3 Fluorescence Conformal coating materials, except

type XY, shall be ﬂuorescent by ultra-violet illumination

(black light).

3.5.4 Fungus Resistance The resistance of the confor-

mal coating material to support or be attacked by biologi-

cal growth shall be determined in accordance with IPC-

TM-650, Test Method 2.6.1.1.

The cured conformal coating shall not contribute to or be

attacked by biological growth.

3.5.5 Flexibility Tin panels prepared in accordance with

FED-STD-141, Method 2012 shall be used as test vehicles

for ﬂexibility testing. When the coated panels are tested in

accordance with IPC-TM-650, Test Method 2.4.5.1, there

shall be no evidence of cracking or crazing on the cured

conformal coating.

3.5.6 Flammability Flammability testing of the cured

conformal coating shall be performed in accordance with

the detailed requirements of UL 94 HB (Horizontal Burn-

ing Test) test methods.

The cured conformal coating shall meet UL 94 HB (Hori-

zontal Burning Test) requirements:

a. Not have a burning rate exceeding 40 mm [1.57 in] per

minute over a 75 mm [2.95 in] span for specimens hav-

ing a thickness of 3.0 to 13 mm [0.118 to 0.512 in], or

b. Not have a burning rate exceeding 75 mm [2.95 in] per

minute over a 75 mm [2.95 in] span for specimens hav-

ing a thickness less than 3.0 mm [0.118 in], or

c. Cease to burn before the 100 mm [3.937 in] reference

mark.

3.6 Electrical Requirements

3.6.1 Dielectric Withstanding Voltage (DWV)

Dielectric

withstanding voltage of the cured conformal coating shall

be measured in accordance with IPC-TM-650, Test Method

2.5.7.1.

There shall be no disruptive discharge evidenced by ﬂash-

over (surface discharge), sparkover (air discharge) or

breakdown (puncture discharge). The leakage rate shall not

exceed 10 microamperes.

3.7 Environmental Requirements

3.7.1 Moisture and Insulation Resistance

The confor-

mal coating materials shall be tested in accordance with

IPC-TM-650, Test Method 2.6.3.4. After the completion of

temperature and humidity testing cycles, the panels shall

be maintained at the reference conditions at a temperature

of 25 ± 5°C [77 ± 9°F] and a relative humidity of 50 ± 5%,

for a period of 24 hours.

The minimum insulation resistance shall be 100 MΩ for

Class A and 500 MΩ for Class B products during humid-

ity, after humidity and one to two hours at reference con-

ditions, and after 24 hours at reference conditions.

Appearance shall be assessed and dielectric withstanding

voltage shall be tested and meet the requirements as speci-

ﬁed in 3.5.2 and 3.6.1 respectively; after 24 hours at the

reference conditions.

3.7.2 Thermal Shock Conformal coating products shall

be tested in accordance with IPC-TM-650, Test Method

2.6.7.1, with test conditions of -65°C [-85°F] to 125°C

[257°F], 100 cycles.

After the temperature cycles are completed, the coated test

vehicles shall be maintained at the reference conditions at

a temperature of 25 ± 5°C [77 ± 9°F] and a relative humid-

ity of 50 ± 5% for a period of 24 hours; after which appear-

ance shall be assessed and dielectric withstanding voltage

shall be tested and meet the requirements as speciﬁed in

3.5.2 and 3.6.1 respectively.

3.7.3 Temperature and Humidity Aging (Hydrolytic Sta-

bility)

Class B conformal coating products shall be tested

in accordance with IPC-TM-650, Test Method 2.6.11.1.

IPC-CC-830B August 2002

Provided by IHS under license with IPC

Not for Resale

No reproduction or networking permitted without license from IHS

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