IPC-CC-830B.pdf - 第9页

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 (c…

Appendix A Example of Qualiﬁcation Inspection

Report

........................................................ 9

Appendix B Example of Qualiﬁcation Retention

Inspection Report

.................................. 10

Appendix C Example of Quality Conformance

Inspection Report

.................................. 11

Figures

Figure 4-1 IPC-B-25A.......................................................... 7

Figure 4-2 Test Coupon with ‘‘Y’’ Shape Pattern................ 7

Tables

Table 3-1 Requirements for Qualiﬁcation, Qualiﬁcation

Retention and Quality Conformance of

Conformal Coating Products................................ 3

Table 4-1 Test Vehicles and Sample Sizes.......................... 6

Table 4-2 Thickness Requirements on Test Vehicle ........... 7

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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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

IPC-B-25A Multipurpose Test Board

IPC-T-50 Terms and Deﬁnitions for Interconnecting and

Packaging Electronic Circuits

IPC-TM-650 Test Methods Manual

2.3.42 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

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

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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