IEC PAS 61191-10-2022 PDF

Full title and description

St IEC PAS 61191-10:2022 — Printed board assemblies — Part 10: Application and utilization of protective coatings for electronic assemblies. This Publicly Available Specification (PAS) gives practical guidance on selection, properties, application, testing, handling and repair of protective (conformal) coatings used on printed board assemblies to improve corrosion and moisture resistance and long‑term reliability.

Abstract

IEC PAS 61191-10:2022 provides recommendations and practical guidelines covering requirements for protective coating materials, desired film properties, substrate preparation, application processes (manual and automated), process control, qualification and testing, inspection, repair/rework and relevant regulatory/environmental considerations. The document is intended to help manufacturers, designers and test laboratories control coating application from PCB layout through final functional test to achieve reliable protection against moisture, contamination and corrosion.

General information

• Status: Published (Publicly Available Specification).
• Publication date: 18 July 2022.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 31.180 (Printed circuits and boards); 31.190 (Electronic component assemblies).
• Edition / version: Edition 1.0 (2022).
• Number of pages: 209 pages.

Key bibliographic and status details above are from the IEC publication record and cataloguing information.

Scope

The PAS covers guidelines for the selection, application and utilization of liquid protective coatings (conformal coatings) for electronic assemblies. It addresses coating classification and chemistries, material and film property requirements, substrate cleaning and pretreatment, application techniques (brush, spray, dip/flood, selective/automated systems, jetting, parylene deposition), curing/drying, in‑process controls, storage/handling, inspection methods, qualification testing (climate, immersion, adhesion, electrical insulation, thickness measurement) and recommended repair/rework procedures. The intent is practical process control from design/layout through functional testing after coating.

Key topics and requirements

• Classification of coating chemistries (acrylates, epoxies, polyurethanes, silicones, parylenes, UV‑curable systems and hybrids) and solvent vs. solvent‑free options.
• Film properties: adhesion, flexibility/elasticity, hardness, dielectric strength, moisture uptake, thermal behaviour and compatibility with components and soldering processes.
• Substrate preparation: cleaning, ionic contamination control, surface energy considerations and inspection prior to coating.
• Application methods and process control: manual and automated spraying, dipping/flooding, selective coating, dispensing/jetting and parameters for consistent film thickness and coverage.
• Curing/drying and verification: temperature/UV cure protocols, measurement of cure state and monitoring of viscosity/aging of coating materials.
• Qualification and testing: adhesion, coating thickness, climatic exposure, immersion/condensation tests, electrical insulation/resistance testing and reliability assessment.
• Repair, rework and stripping: recommended chemical and mechanical removal methods, procedures for soldering through coatings and re‑coating after rework.
• Environmental and regulatory considerations: VOCs, workplace safety and applicable air‑quality and chemical restrictions.

The list above summarises the main technical topics and practical requirements addressed by the PAS.

Typical use and users

Primary users include PCB designers, electronics/process engineers, quality and reliability engineers, test laboratories, coating manufacturers/suppliers and production operators. Industries that commonly apply this guidance include automotive, aerospace, telecommunications, industrial controls and other sectors where moisture/corrosion protection and long‑term reliability of assemblies are critical. The PAS aids in selection of coating types and in establishing application, inspection and qualification procedures.

Related standards

IEC PAS 61191-10:2022 is part of the IEC 61191 family addressing printed board assemblies. Related documents in the 61191 series include the generic and sectional specifications for printed board assemblies (for example IEC 61191-1, IEC 61191-2, IEC 61191-3, IEC 61191-4 and other parts covering requirements and test methods for assembly technologies). Users often apply those parts alongside this PAS to cover soldering, assembly and process control requirements.

Keywords

conformal coating; protective coating; printed board assemblies; PCB coating; coating application; coating qualification; adhesion; moisture protection; corrosion protection; rework; curing; VOC.

FAQ

Q: What is this standard?

A: IEC PAS 61191-10:2022 is a Publicly Available Specification giving practical guidance on the application and use of protective (conformal) coatings for electronic assemblies (printed board assemblies).

Q: What does it cover?

A: It covers coating types and chemistry, film property requirements, substrate preparation and cleanliness, application methods (manual and automated), curing/drying, process control, inspection and testing, repair/rework and regulatory considerations.

Q: Who typically uses it?

A: PCB designers, manufacturing/process engineers, quality and reliability engineers, coating suppliers and test laboratories—especially in automotive, aerospace, telecoms and industrial electronics where environmental protection and long‑term reliability are important.

Q: Is it current or superseded?

A: The PAS was published on 18 July 2022 (Edition 1.0). It is published as a PAS (not an International Standard) and the IEC record lists a stability date in the cataloguing metadata; users should check the IEC webstore/catalogue for the current status or any later revisions before applying it in regulatory or contractual contexts.

Q: Is it part of a series?

A: Yes — it belongs to the IEC 61191 printed board assemblies family and is intended to be used in conjunction with other IEC 61191 parts that define generic and sectional requirements and test methods for electronic assembly processes.

Q: What are the key keywords?

A: Conformal coating, protective coating, PCB coating, coating application, coating qualification, adhesion, moisture protection, corrosion protection, rework, curing, VOC.