FprEN IEC 60695-5-2:2026

• Status: Not Published
• Publication Date: 06-Dec-2026
• ICS: 13.220.99 - Other standards related to protection against fire
• ICS: 19.020 - Test conditions and procedures in general
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: CLC/SR 89 - Fire hazard testing
• Current Stage: 5020 - Vote circulated - Formal Approval
• Start Date: 24-Jul-2026
• Due Date: 30-May-2025
• Completion Date: 24-Jul-2026
• Ref Project: oSIST prEN IEC 60695-5-2:2026 - Fire hazard testing - Part 5-2: Corrosion damage effects of fire effluent - Summary and relevance of test methods

Overview

FprEN IEC 60695-5-2:2026 is an international standard developed by the International Electrotechnical Commission (IEC) under technical committee 89, addressing fire hazard testing-specifically, the corrosion damage effects of fire effluents. This document provides a detailed summary and assessment of commonly used test methods for determining the potential corrosivity of fire effluents produced from burning materials, with a particular focus on applications for electrotechnical products and installations.

The objective of this standard is to support fire hazard evaluation by summarizing relevant test methods, discussing their practical significance, and guiding the selection of appropriate tests for specific scenarios. By standardizing the assessment of corrosion damage due to fire effluent, the standard contributes to increased safety and reliability in electrical and electronic equipment design.

Key Topics

• Corrosion Effects of Fire Effluent: Defines and describes the ways in which fire-generated gases and particulates can cause physical or chemical damage to materials and components, impairing their function.

• Test Method Classification:

  • Nature of Test Specimens: Includes approaches for testing complete products, product components, or material samples.
  • Physical Fire Models: Discusses laboratory methods and the relevance of test conditions to real fire scenarios, considering variables like temperature, ventilation, and heat flux.
  • Measurement Nature: Covers direct assessments (e.g., using actual products as corrosion targets), simulated targets (e.g., metal coupons), and indirect methods (e.g., measuring acidity and conductivity of fire effluent solutions).

• Test Methods Summarized:

  • Halogen Acid Determination (IEC 60754-1): Measures halogen acid gas released during combustion-a key indicator of potential corrosivity.
  • Acidity/Conductivity Testing (IEC 60754-2 and national standards): Assesses the corrosive potential of gases by dissolving effluent in water and measuring resultant acidity and electrical conductivity.
  • Copper Corrosion Tests (ASTM D 2671): Qualitative assessment using copper mirrors or conductors to detect corrosive gases from insulating tubing.
  • Cone Corrosimeter Method (ISO 11907-4, ASTM D 5485): Quantitative evaluation using metal loss (typically copper) to measure corrosion induced by fire gases.

• Relevance and Practical Use: Each method's suitability for specific products, scenarios, and materials is discussed, with attention to correlation with real fire conditions, repeatability, and reproducibility.

Applications

FprEN IEC 60695-5-2:2026 offers essential guidance for:

• Manufacturers of Electrical and Electronic Equipment: Supporting fire hazard assessments during product design, material selection, and component validation to minimize corrosion damage in fire events.
• Testing Laboratories: Enabling consistent, reliable assessments of corrosivity in accordance with internationally recognized methods, aiding material ranking and certification.
• Regulators and Safety Assessors: Informing safety requirements and regulations by providing standardized approaches to assess the impacts of fire effluent on installations, especially in critical or high-value environments.
• Facility Managers and Risk Assessors: Assisting in evaluating the potential for fire-induced corrosion damage to infrastructures such as data centers, control rooms, and industrial facilities.

Related Standards

• IEC 60695-5-1: General guidance on corrosion damage effects of fire effluent-serves as a foundational document for part 5-2.
• IEC 60695-4: Terminology concerning fire tests, essential for understanding terms used in fire hazard testing.
• ISO 13943:2017: Fire safety vocabulary-provides standard definitions crucial for unified understanding.
• IEC 60754-1 and IEC 60754-2: Specific methods for assessing halogen acid gas evolution and the acidity/conductivity of combustion gases.
• ASTM D 2671, ISO 11907-4, ASTM D 5485: Pertinent national and international standards cited for specific corrosion assessment methods.

By adhering to FprEN IEC 60695-5-2:2026, organizations in electrical engineering and fire safety can optimize product safety, reduce risks associated with fire-induced corrosion, and ensure compliance with international best practices for fire hazard testing.

SLOVENSKI STANDARD
01-marec-2026
Preskušanje požarne ogroženosti - 5-2. del: Poškodbe zaradi korozijskega učinka
izžarevanja ognja - Povzetek in relevantnost preskusnih metod
Fire hazard testing - Part 5-2: Corrosion damage effects of fire effluent - Summary and
relevance of test methods
Ta slovenski standard je istoveten z: prEN IEC 60695-5-2:2026
ICS:
13.220.99 Drugi standardi v zvezi z Other standards related to
varstvom pred požarom protection against fire
19.020 Preskuševalni pogoji in Test conditions and
postopki na splošno procedures in general
29.020 Elektrotehnika na splošno Electrical engineering in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

89/1641/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60695-5-2 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-16 2026-04-10
SUPERSEDES DOCUMENTS:
89/1614/CD, 89/1638/CC
IEC TC 89 : FIRE HAZARD TESTING
SECRETARIAT: SECRETARY:
Germany Mr Bernd Komanschek
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 10,TC 14,TC 20,SC 22F,SC 23A,TC 46,TC 61,SC
86A,TC 99,TC 104,TC 112,SC 121A,ACOS
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Fire hazard testing - Part 5-2: Corrosion damage effects of fire effluent - Summary and relevance
of test methods
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee
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IEC CDV 60695-5-2 © IEC 2025
1 CONTENTS
2 FOREWORD . 4
3 INTRODUCTION . 6
4 1 Scope . 7
5 2 Normative references . 7
6 3 Terms and definitions . 7
7 4 Classification of test methods . 8
8 4.1 General . 8
9 4.2 Test specimen . 8
10 4.2.1 Product testing . 8
11 4.2.2 Material or composite sample testing . 8
12 4.3 The physical fire model . 8
13 4.4 The nature of the corrosivity measurement . 9
14 4.4.1 Product as target . 9
15 4.4.2 Simulated product as target . 9
16 4.4.3 Indirect assessment . 11
17 5 Published test methods . 11
18 5.1 General . 11
19 5.2 Tests for the determination of halogen acid in combustion gases . 11
20 5.2.1 Standards . 11
21 5.2.2 Purpose and principle . 11
22 5.2.3 Test specimen . 11
23 5.2.4 Test method . 11
24 5.2.5 Repeatability and reproducibility . 11
25 5.2.6 Relevance of test data to corrosion hazard assessment . 11
26 5.3 Tests for the determination of the acidity and conductivity of combustion
27 gases dissolved in an aqueous solution . 12
28 5.3.1 Standards . 12
29 5.3.2 Purpose and principle . 12
30 5.3.3 Test specimen . 12
31 5.3.4 Test method . 12
32 5.3.5 Repeatability and reproducibility . 12
33 5.3.6 Relevance of test data to corrosion hazard assessment . 12
34 5.4 Tests for the determination of corrosive gases by evaluation of copper
35 corrosion in ASTM D 2671 – Sections 89 to 95 [9] . 13
36 5.4.1 Purpose and principle . 13
37 5.4.2 Test specimen . 13
38 5.4.3 Test methods . 13
39 5.4.4 Special observations . 13
40 5.4.5 Repeatability and reproducibility . 13
41 5.4.6 Relevance of test data to corrosion hazard assessment . 13
42 5.5 Cone corrosimeter method . 13
43 5.5.1 Standards . 13
44 5.5.2 Purpose and principle . 13
45 5.5.3 Test specimen . 14
46 5.5.4 Corrosion target . 14
47 5.5.5 Test method . 14
IEC CDV 60695-5-2 © IEC 2025
48 5.5.6 Special observation . 15
49 5.5.7 Repeatability and reproducibility . 15
50 5.5.8 Relevance of test data to corrosion hazard assessment . 15
51 6 Overview of methods and relevance of data . 15
52 Annex A (informative) Acidity and conductivity of aqueous solutions – Test methods . 18
53 Annex B (informative) Determination of repeatability and reproducibility –
54 Comparative tests of solutions of combustion gases . 19
55 Bibliography . 23
57 Figure 1 – Schematic drawing of a typical corrosion target of defined metal thickness …….15
59 Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011) . 10
60 Table 2 – Overview of corrosivity test methods . 17
61 Table A.1 – Test methods for the measurement of acidity and conductivity of aqueous
62 solutions obtained after bubbling combustion effluent through water . 18
63 Table B.1 – Determination of repeatability and reproducibility – Comparative pH tests
64 on solutions of combustion gases . 20
65 Table B.2 – Determination of repeatability and reproducibility – Comparative resistivity
66 tests on solutions of combustion gases . 20
67 Table B.3 – Results obtained on brominated polycarbonate . 22
IEC CDV 60695-5-2 © IEC 2025
70 INTERNATIONAL ELECTROTECHNICAL COMMISSION
71 ____________
73 FIRE HAZARD TESTING –
75 Part 5-2: Corrosion damage effects of fire effluent –
76 Summary and relevance of test methods
78 FOREWORD
79 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
80 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
81 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
82 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
83 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
84 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
85 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
86 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
87 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
88 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
89 consensus of opinion on the relevant subjects since each technical committee has representation from all
90 interested IEC National Committees.
91 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
92 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
93 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
94 misinterpretation by any end user.
95 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
96 transparently to the maximum extent possible in their national and regional publications. Any divergence between
97 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
98 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
99 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
100 services carried out by independent certification bodies.
101 6) All users should ensure that they have the latest edition of this publication.
102 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
103 members of its technical committees and IEC National Committees for any personal injury, property damage or
104 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
105 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
106 Publications.
107 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
108 indispensable for the correct application of this publication.
109 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
110 rights. IEC shall not be held responsible for identifying any or all such patent rights.
111 International Standard IEC 60695-5-2 has been prepared by IEC technical committee 89: Fire
112 hazard testing.
113 It has the status of a basic safety publication in accordance with IEC Guide 104 and
114 ISO/IEC Guide 51.
115 The text of this International Standard is based on the following documents:
FDIS Report on voting
89/XXXX/FDIS 89/YYYY/RVD
117 Full information on the voting for its approval can be found in the report on voting indicated in
118 the above table.
119 This document was drafted in accordance with ISO/IEC Directives, Part 2.
120 This International Standard is to be read in conjunction with IEC 60695-5-1.
IEC CDV 60695-5-2 © IEC 2025
121 A list of all parts in the IEC 60695 series, published under the general title Fire hazard testing,
122 can be found on the IEC website.
123 IEC 60695-5 consists of the following parts:
124 Part 5-1: Corrosion damage effects of fire effluent - General guidance
125 Part 5-2: Corrosion damage effects of fire effluent – Summary and relevance of test methods
126 The committee has decided that the contents of this document will remain unchanged until the
127 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
128 specific document. At this date, the document will be
129 • reconfirmed,
130 • withdrawn,
131 • replaced by a revised edition, or
132 • amended.
133 The National Committees are requested to note that for this document the stability date is 2029.
IEC CDV 60695-5-2 © IEC 2025
135 INTRODUCTION
136 In the design of an electrotechnical product the risk of fire and the potential hazards associated
137 with fire need to be considered. In this respect the objective of component, circuit and
138 equipment design, as well as the choice of materials, is to reduce the risk of fire to a tolerable
139 level even in the event of reasonably foreseeable (mis)use, malfunction or failure.
140 IEC 60695-1-10 [1] , IEC 60695-1-11 [2], and IEC 60695-1-12 [3] provide guidance on how this
141 is to be accomplished.
142 Fires involving electrotechnical products can also be initiated from external non -electrical
143 sources. Considerations of this nature are dealt with in an overall fire hazard assessment.
144 The aim of the IEC 60695 series is to save lives and property by reducing the number of fires
145 or reducing the consequences of the fire. This can be accomplished by:
146 • trying to prevent ignition caused by an electrically energised component part and, in the
147 event of ignition, to confine any resulting fire within the bounds of the enclosure of the
148 electrotechnical product.
149 • trying to minimise flame spread beyond the product’s enclosure and to minimise the harmful
150 effects of fire effluents including heat, smoke, and toxic or corrosive combustion products.
151 All fire effluent is corrosive to some degree and the level of potential to corrode depends on the
152 nature of the fire, the combination of combustible materials involved in the fire, the nature of
153 the substrate under attack, and the temperature and relative humidity of the environment in
154 which the corrosion is taking place. There is no evidence that fire effluent from electrotechnical
155 products offers greater risk of corrosion damage than the fire effluent from other products such
156 as furnishings, building materials, etc.
157 The performance of electrical and electronic components can be adversely affected by
158 corrosion damage when subjected to fire effluent. A wide variety of combinations of small
159 quantities of effluent gases, smoke particles, moisture and temperature may provide conditions
160 for electrical component or system failures from breakage, overheating or shorting.
161 Evaluation of potential corrosion damage is particularly important for high value and safety-
162 related electrotechnical products and installations.
163 Technical committees responsible for the products will choose the test(s) and specify the level
164 of severity.
165 The study of corrosion damage requires an interdisciplinary approach involving chemistry,
166 electricity, physics, mechanical engineering, metallurgy and electrochemistry. In the
167 preparation of this part of IEC 60695, all of the above have been considered.
168 IEC 60695-5-1 defines the scope of the guidance and indicates the field of application.
169 IEC 60695-5-2 provides a summary of test methods including relevance and usefulness.
Numbers in square brackets refer to the bibliography.
IEC CDV 60695-5-2 © IEC 2025
172 FIRE HAZARD TESTING –
174 Part 5-2: Corrosion damage effects of fire effluent –
175 Summary and relevance of test methods
179 1 Scope
180 This part of IEC 60695 summarises the test methods that are used in the assessment of the
181 corrosivity of fire effluent. It presents a brief summary of test methods in common use, either
182 as international standards, national or industry standards. It includes special observations on
183 their relevance, for electrotechnical products and their materials, to real fire scenarios and gives
184 recommendations on their use.
185 2 Normative references
186 The following documents are referred to in the text in such a way that some or all of their content
187 constitutes requirements of this document. For dated references, only the edition cited applies.
188 For undated references, the latest edition of the referenced document (including any
189 amendments) applies.
190 IEC 60695-4, Fire hazard testing – Part 4: Terminology concerning fire tests
191 IEC 60695-5-1, Fire hazard testing – Part 5-1: Corrosion damage effects of fire effluent -
192 General guidance
193 ISO 13943:2017, Fire safety – Vocabulary
194 3 Terms and definitions
195 For the purposes of this document, the terms and definitions given in IEC 60695-4 and
196 ISO 13943:2017 (some of which are reproduced below) apply.
197 3.1
198 corrosion damage
199 physical and/or chemical damage or impaired function caused by chemical action
200 [SOURCE: ISO 13943:2017, 3.69]
201 3.2
202 corrosion target
203 sensor used to determine the degree of corrosion damage (3.1), under specified test conditions
204 Note 1 to entry: This sensor may be a product, a component. It may also be a reference material or object used to
205 simulate the behaviour of a product or a component.
206 [SOURCE: ISO 13943:2017, 3.70]
207 3.3
208 fire effluent
209 all gases and aerosols, including suspended particles created by combustion or pyrolysis (3.6)
210 and emitted to the environment
211 [SOURCE: ISO 13943:2017, 3.123]
212 3.4
213 fire scenario
214 qualitative description of the course of a fire with respect to time, identifying key events that
215 characterize the studied fire and differentiate it from other possible fires
IEC CDV 60695-5-2 © IEC 2025
216 Note 1 to entry: See fire scenario cluster (ISO 13943:2017, 3.154) and representative fire scenario
217 (ISO 13943:2017, 3.153).
218 Note to entry: It typically defines the ignition and fire growth processes, the fully developed fire stage, the fire decay
219 stage, and the environment and systems that will impact on the course of the fire.
220 Note to entry: Unlike deterministic fire analysis, where fire scenarios are individually selected and used as design
221 fire scenarios, in fire risk assessment, fire scenarios are used as representative fire scenarios within fire scenario
222 clusters.
223 [SOURCE: ISO 13943:2017, 3.152]
224 3.5
225 physical fire model
226 laboratory process, including the apparatus, the environment and the fire test procedure
227 intended to represent a certain phase of a fire
228 [SOURCE: ISO 13943:2017, 3.298]
229 3.6
230 pyrolysis
231 chemical decomposition of a substance by the action of heat
232 Note 1 to entry: Pyrolysis is often used to refer to a stage of fire before flaming combustion has begun.
233 Note 2 to entry: In fire science, no assumption is made about the presence or absence of oxygen.
234 [SOURCE: ISO 13943:2017, 3.316]
235 3.7
236 smoke
237 visible part of a fire effluent (3.3)
238 [SOURCE: ISO 13943:2017, 3.347]
239 4 Classification of test methods
240 4.1 General
241 The test methods included in this document can generally be classified according to the
242 following three criteria:
243 a) the nature of the test specimen which is burnt;
244 b) the physical fire model used in the test;
245 c) the nature of the measurement of corrosivity.
246 4.2 Test specimen
247 4.2.1 Product testing
248 The test specimen is a manufactured product or a representative portion of a product. Examples
249 include a printed circuit board, a switchboard, a computer or a cable.
250 4.2.2 Material or composite sample testing
251 The test specimen is a basic material (solid or liquid), or composite of materials.
252 4.3 The physical fire model
253 Test methods use a wide variety of heat sources and geometries. The amount, the rate of
254 production and the corrosive nature of fire effluent released from a given material or product is
255 not an inherent property of that material or product, but is critically dependent on the conditions
256 under which that material or product is burnt. In a fire scenario or a fire test, the chemical nature
257 of the fuel, the decomposition temperature and the amount of ventilation are the main variables
258 which affect the composition of fire effluent.
259 It is critical to show that the test conditions defined in a standardized test method are relevant
260 to, and replicate, the desired stage of a real fire. ISO has published a general classification of
261 fire stages in ISO 19706:2011, shown in Table 1. The important factors affecting effluent
262 production are oxygen concentration, irradiance and temperature.
IEC CDV 60695-5-2 © IEC 2025
263 4.4 The nature of the corrosivity measurement
264 4.4.1 Product as target
265 The corrosion target is a manufactured product or a representative portion of a product, which
266 can be represented by a test specimen. Examples include: printed wiring boards, switchboards,
267 washing machines and computers.
268 The corrosion damage effects of fire effluent on the product can be assessed by degradation of
269 function as determined by inspection or measurement.
270 4.4.2 Simulated product as target
271 When a simulated product is used as the target, the corrosion target is typically a reference
272 circuit, a thin sheet of metal or a metal mirror. The corrosion damage effects of fire effluent on
273 the target can be assessed by changes in appearance, mass or measurements of mechanical,
274 physical or electrical characteristics.
IEC CDV 60695-5-2 © IEC 2025
275 Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011)
Max. temperature Oxygen volume
Heat flux to
100[CO ]
[CO] 2
Fuel/air
fuel surface
C %
Fire stage equivalence [CO2]
[CO2]+[CO]
ratio (plume)
v/v
kW/m Fuel surface Upper layer Entrained Exhausted
% efficiency
1 Non-flaming
a self-sustaining not
d
450 to 800 25 to 85 20 20 – 0,1 to 1 50 to 90
(smouldering) applicable
b oxidative pyrolysis
a
b c c
from externally applied – 300 to 600 20 20  1
radiation
c anaerobic pyrolysis
b c c
from externally applied – 100 to 500 0 0  1
radiation
d e
2 Well-ventilated flaming 0 to 60 350 to 650 50 to 500  20  20  1  0,05  95
f
3 Underventilated flaming
a small, localized fire,
generally in a poorly
a
0 to 30 300 to 600 50 to 500 15 to 20 5 to 10  1 0,2 to 0,4 70 to 80
ventilated
compartment
g h i
b post-flashover fire 50 to 150 350 to 650  600  15  5  1 0,1 to 0,4 70 to 90
a
The upper limit is lower than for well-ventilated flaming combustion of a given combustible.
b
The temperature in the upper layer of the fire room is most likely determined by the source of the externally applied radiati on and room geometry.
c
There are few data, but for pyrolysis this ratio is expected to vary widely depending on the material chemistry and the local ventilation and thermal conditions.
d
The fire’s oxygen consumption is small compared to that in the room or the inflow, the flame tip is below the hot gas upper l ayer or the upper layer is not yet significantly
vitiated to increase the CO yield significantly, the flames are not truncated by contact with another object, and the burning rate is controlled by the availability of fuel.
e
The ratio can be up to an order of magnitude higher for materials that are fire-resistant. There is no significant increase in this ratio for equivalence ratios up to  0,75, and
between  0,75 and 1, some increase in this ratio may occur.
f
The fire’s oxygen
...