IPC-CC-830B.pdf - 第10页
2.4.5.1 Flexibility 2.5.7.1 Dielectric Withstanding V oltage - 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 Shoc…
Qualification and Performance of Electrical Insulating
Compound for Printed Wiring Assemblies
1 SCOPE
1.1 Scope
This standard establishes qualification and
conformance requirements for electrical insulating com-
pounds (conformal coatings). It has been designed and con-
structed with the intent of obtaining maximum confidence
in the materials with minimum test redundancy. This stan-
dard covers:
• The qualification and qualification retention of the confor-
mal coating material (Table 3-1, Column A and B).
• The quality conformance of conformal coating material
properties (Table 3-1, Column C).
For the purpose of this standard, the term conformal coat-
ing is used herein when referring to a type of protective
coating for use on printed wiring assemblies. The confor-
mal coating is intended to provide protection from moisture
and contamination and provide electrical insulation; not as
a sole source of mechanical support.
For the purpose of this standard, inspections are performed
on standardized test vehicles instead of real production
assemblies. A standardized test vehicle refers to the test
vehicle specified per test method indicated, coated with the
conformal coating under inspection.
1.2 Purpose With standardized testing on standardized
test vehicles under test conditions specified in test methods
listed herein, this standard enables a manufacturer to
qualify his conformal coating product and express the
qualification it possesses. This standard also enables the
manufacturer to attest the conformance of the quality of
production to the qualification of each product.
1.3 Classification
1.3.1 Types Conformal coatings shall be categorized
into types by the cured chemistry of the coating. The type
for multifunctional materials shall be based on the chemis-
try type which is the highest percentage by weight.
Conformal coatings shall be of the following types:
Type AR — Acrylic
Type ER — Epoxy
Type SR — Silicone
Type UR — Polyurethane
Type XY— Paraxylylene
1.3.2 Classes This standard allows a manufacturer to
classify his qualified products according to functional capa-
bilities. Inspection and testing requirements are different
for each class. Classification attained shall be reported in
the qualification inspection report. An example of the
report format is shown in Appendix A.
Conformal coatings shall be of the following classes:
Class A — Non-hydrolytically stable conformal coating.
Temperature and humidity aging test is not required for this
class of product. Lower moisture insulation resistance is
permitted (see 3.7.1).
Class B — Hydrolytically stable conformal coating. Tem-
perature and humidity aging test is required for this class of
product. Higher moisture insulation resistance is required
(see 3.7.1).
Note: Previous versions of this specification, and other IPC
documents, make reference to ‘‘Class 1,’’ ‘‘Class 2’’ and
‘‘Class 3.’’ Inspection and testing requirements for these
classes are not directly correlated to Class A and B.
1.4 Interpretation ‘‘Shall,’’ the imperative form of the
verb, is used throughout this standard whenever a require-
ment is intended to express a provision that is mandatory.
Deviation from a ‘‘shall’’ requirement may be considered if
sufficient data is supplied to justify the exception.
The words ‘‘should’’ and ‘‘may’’ are used whenever it is
necessary to express non-mandatory provisions. ‘‘Will’’ is
used to express a declaration of purpose.
To assist the reader, the word ‘‘shall’’ is presented in bold
characters.
2 APPLICABLE DOCUMENTS
The following documents of the issue currently in effect
form a part of this standard to the extent specified herein.
2.1 IPC
1
IPC-B-25A Multipurpose Test Board
IPC-T-50 Terms and Definitions for Interconnecting and
Packaging Electronic Circuits
IPC-TM-650 Test Methods Manual
2
2.3.42 Identification of Solder Mask Products Using
Fourier Transform Infrared Spectroscopy (FTIR)
1. www.ipc.org
2. Current and revised IPC Test Methods are available through IPC-TM-650 subscription and on the IPC Web site (www.ipc.org/html/testmethods.htm).
August 2002 IPC-CC-830B
1
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
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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
3
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
4
ASTM-D-1005 Measurement of Dry Film Thickness of
Organic Coatings
ASTM-D-1084 Viscosity of Adhesives, Tests for
2.4 Underwriters Laboratories
5
UL 94 Flammability
2.5 ANSI
6
NCSL Z540-1 Calibration Calibration Laboratories and
Measuring and Test Equipment
2.6 ISO
7
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
2
Copyright Association Connecting Electronics Industries
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
XX
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
XX
3.5.5 Flexibility IPC-TM-650
2.4.5.1
X
3.5.6 Flammability UL 94 HB X X
3.6.1 Dielectric Withstanding Voltage IPC-TM-650
2.5.7.1
X
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
X
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
3
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
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