GB/T 5169.35-2025Fire hazard testing for electric and electronic products - Part 35: Corrosion damage effects of fire effluent - General guidance (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 35 of "Fire Hazard Testing for Electrical and Electronic Products". The "Fire Hazard Testing for Electrical and Electronic Products" document has been published...

See Appendix NA for some details.

This document replaces GB/T 5169.35-2015 "Fire Hazard Testing of Electrical and Electronic Products - Part 35: Corrosion Hazards of Combustion Streams".

Compared with GB/T 5169.35-2015, the General Principles have the following main technical changes, except for structural adjustments and editorial modifications.

a) The terms "ignition attenuation," "flashover," "complete ignition," "physical ignition model," and "small-scale ignition test" have been added (see 3.3, 3.6).

3.7, 3.9, 3.10);

b) ISO/T R9122-1 was changed to ISO 19706, and the contents of Table 1 were updated accordingly (see Table 1, 2015 version).

This document is equivalent to IEC 60695-5-1:2021 "Fire hazard testing - Part 5-1.Corrosion of combustion flue gas".

General Principles of Hazards.

The following minimal editorial changes have been made to this document.

---To align with the existing standard series, the document name has been changed to "Fire Hazard Testing of Electrical and Electronic Products - Part 35: Combustion Flue Gases" General Principles of Corrosion Hazards of Flow;

---Move the references cited in Chapter 2 to the bibliography;

---Replace ISO 13943:2017 with ISO 13943:2023 (see Chapter 3), because the content referenced in ISO 13943:2023 is consistent with...

The content referenced in ISO 13943:2017 has no technical differences, and the latest version is used.

---Appendix NA (Informative) has been added, listing the published portions of "Fire Hazard Testing for Electrical and Electronic Products".

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Electrical Equipment Industry Association.

This document is under the jurisdiction of the National Technical Committee on Standardization of Fire Hazard Testing for Electrical and Electronic Products (SAC/TC300).

Introduction

The design of all electrical and electronic products must consider fire risks and potential fire hazards. This includes the design of components, circuits, and parts.

The purpose of material selection is to reduce the risk of fire to an acceptable level even in the event of foreseeable misuse, malfunction, or failure.

The purpose of the "Fire Hazard Testing of Electrical and Electronic Products" series of standards is to save lives by reducing the number of fires or mitigating their severity.

It can protect life and property. It can.

---Take every effort to prevent fires caused by live components. If a fire does occur, limit the fire to the casing of the electrical or electronic product.

---Minimize the spread of flame outside the product casing and minimize the combustion products, including heat, smoke, toxic or corrosive gases.

To minimize the harmful impact.

The "Fire Hazard Testing of Electrical and Electronic Products" currently consists of 40 parts, divided into three main sub-fields.

---The guidelines and terminology standards for fire hazard testing assessment, including one terminology section and six assessment guidelines, aim to provide guidance for professionals in this field.

Provides guidelines and reference procedures for fire hazard assessment;

---Ignition test standards, including 5 basic test methods for glow wire/hot wire, 8 flame test methods, and 2 tests for resistance to abnormal heat.

The test methods, including one arc ignition test method, aim to introduce methods applicable to manufacturers and testing institutions of electrical and electronic equipment.

A small-scale experimental method that uses a specific heat source to simulate the heat source that causes a fire;

---The hazard assessment criteria for combustion flue gas include 2 aspects of corrosivity, 2 aspects of smoke obscuration, 5 aspects of toxicity, 2 aspects of heat release, and 2 aspects of flame.

Surface spread is intended to provide information for measuring the toxicity, corrosiveness, smoke blurring, and thermal properties of combustion fumes from electrical and electronic products and their materials.

Guidelines on release procedures and the current technical status of testing methods.

All combustion flue gas is corrosive to some extent; the degree of potential corrosion depends on the type of fire and the potential sources of corrosion.

The composition of the combustible materials, the type of the corroded substrate, and the temperature and relative humidity of the environment in which the corrosion damage occurred. There is no evidence that it originated from electrical or electronic components.

The risk of corrosion from the combustion fumes of a product is higher than that from other products, such as furniture or building materials.

The corrosive hazards of combustion flue gas can adversely affect the performance of electrical and electronic components. Even small amounts of combustion flue gas and smoke...

Various combinations of fog particles, moisture, and temperature can cause electrical components or systems to malfunction due to breakage, overheating, or short circuits.

The assessment of potential corrosion damage is crucial for high-value and safety-related electrical products and installations.

The product technical committee will select tests and specify the severity level.

In writing this document, the study of corrosion damage requires an interdisciplinary approach, involving chemistry, electrical engineering, physics, mechanical engineering, and metallurgy.

It encompasses multiple disciplines, including metallurgy and electrochemistry.

Fire hazard test of electrical and electronic products Part 35: General Principles of Corrosion Hazards of Combustion Flue Gas

1 Scope

This document describes.

a) Overview of corrosion hazard testing methods;

b) Methods for measuring corrosion hazards;

c) Factors to consider in experimental methods;

d) Correlation between corrosion hazard data and hazard assessment.

This document is intended for product committees to develop standards based on the principles specified in IEC Guide 104 and ISO/IEC Guide 51, and is not intended for use by product committees.

Used by manufacturers or certification bodies.

One of the tasks of the Product Committee is to ensure that this series of standards is used wherever applicable when developing standards for this field. Unless otherwise specified...

Unless otherwise specifically mentioned or listed in the standard, the requirements, test methods or test conditions in this document shall not apply.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.

The URLs for the terminology databases maintained by ISO and IEC for standardization are as follows.

Corrosion damage

Physical and/or chemical hazards or functional impairment caused by chemical action.

[Source. ISO 13943:2023, 3.76] 3.2 Corrosion target A sensor used to measure the degree of corrosion hazard (3.1) under specified conditions.

Note. This sensor may be a product or component. It may also be a reference material or object used to simulate the performance of a product or component.

[Source. ISO 13943:2023, 3.77] 3.3 Fire decay After the fire has developed to its maximum extent, the heat release rate and temperature are in a phase of gradual decline.

[Source. ISO 13943:2023, 3.146]