ISO 14656

• Abstract:

  This International Standard specifies requirements for epoxy powders for use in preparing fusion-bonded epoxycoated steel reinforcing bar, wire and welded fabric. This International Standard also includes requirements for sealing material used to repair damaged areas and cut ends on reinforcing steel. This International Standard defines a flexible (type A) coating and a nonflexible (type B) coating. The adhesion and moisture resistance of fusion-bonded epoxy powder coatings can be enhanced by certain formulation designs. These coating enhancements typically result in a reduction of the coating's flexibility.

• Status: Not Published
• ICS: 25.220.99 - Other treatments and coatings
• ICS: 77.140.15 - Steels for reinforcement of concrete
• ICS: 91.080.40 - Concrete structures
• Technical Committee: ISO/TC 17/SC 16 - Steels for the reinforcement and prestressing of concrete
• Drafting Committee: ISO/TC 17/SC 16/WG 12 - Epoxy coated reinforcement
• Current Stage: 6000 - International Standard under publication
• Start Date: 24-Sep-2026
• Completion Date: 26-Sep-2026

• Revises: ISO 14656:1999 - Epoxy powder and sealing material for the coating of steel for the reinforcement of concrete
• Effective Date: 15-Jun-2024

Overview

ISO 14656 is an International Standard for steel epoxy powder coatings and sealing materials used on reinforcing steel for concrete. It specifies requirements for epoxy powders used to prepare fusion-bonded epoxy-coated steel reinforcing bar, wire, and welded fabric, as well as materials used to repair damaged areas and cut ends.

This standard is especially relevant where durable steel reinforcement protection is needed in concrete structures. It defines two coating types:

• Type A - flexible coating
• Type B - nonflexible coating

ISO 14656 supports consistent product performance, helping manufacturers, fabricators, and project teams assess coating quality, repair compatibility, and qualification testing for reinforced concrete applications.

Key Topics

ISO 14656 focuses on practical requirements for epoxy powder coating systems and their repair materials. Key areas include:

• Material requirements

  • Epoxy powder coating material
  • Texturing surface treatment material
  • Sealing material for repairs

• Coating performance

  • Appearance and storage
  • Chemical resistance
  • Cathodic disbondment resistance
  • Salt spray resistance
  • Chloride permeability
  • Coating flexibility
  • Abrasion resistance
  • Impact resistance

• Sealing material performance

  • Chemical resistance
  • Salt spray resistance

• Qualification testing

  • Test specimens and procedures
  • Coating application procedures
  • Documentation for conformity evaluation

The standard also recognizes that formulation choices can improve adhesion and moisture resistance, although these enhancements may reduce coating flexibility. This makes ISO 14656 particularly useful for balancing protection performance with handling and installation requirements.

Applications

ISO 14656 is widely relevant across the construction and steel reinforcement industry, especially for projects where corrosion resistance and long service life are priorities. Typical applications include:

• Epoxy-coated reinforcing bar for concrete structures
• Coated steel wire and welded fabric
• Repair of damaged coating areas on reinforcing steel
• Sealing of cut ends and exposed regions
• Quality control in coating manufacture and fabrication
• Specification of coating systems for infrastructure projects

It is particularly valuable for reinforced concrete in environments exposed to moisture, chlorides, or other corrosive conditions, where epoxy powder coatings help protect steel reinforcement and support long-term durability.

Related Standards

ISO 14656 is used alongside several related standards in the same technical area:

• ISO 14654 - Epoxy-coated steel for the reinforcement of concrete
• ISO 6272-1 - Falling weight impact resistance test, large-area indenter
• ISO 6272-2 - Falling weight impact resistance test, small-area indenter
• ISO 9352 - Resistance to wear by abrasive wheels

These related standards support testing, qualification, and performance verification for epoxy-coated steel reinforcement and associated coating systems. Together, they provide a strong framework for specifying, evaluating, and maintaining protective coatings for concrete reinforcement.

International
Standard
Second edition
Steel — Epoxy powder and sealing
2026-10
material for the coating of steel for
the reinforcement of concrete
Acier — Poudres époxy et matériau de réparation pour le
revêtement des armatures en acier pour béton
PROOF/ÉPREUVE
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 2
4.1 Coating material .2
4.1.1 Epoxy powder coating .2
4.1.2 Texturing surface treatment material .2
4.2 Sealing material .2
5 Coating requirements . 2
5.1 Appearance and storage .2
5.1.1 Appearance .2
5.1.2 Storage .2
5.2 Chemical resistance .3
5.2.1 General .3
5.2.2 Type A coating .3
5.2.3 Type B coating .3
5.2.4 Type A and B coatings .3
5.2.5 Acceptance criteria .4
5.3 Cathodic disbondment .4
5.3.1 General .4
5.3.2 Equipment .4
5.3.3 Procedure .4
5.3.4 Acceptance criteria .6
5.4 Salt spray resistance .6
5.4.1 General .6
5.4.2 Equipment .6
5.4.3 Procedure .6
5.4.4 Acceptance criteria .7
5.5 Chloride permeability .7
5.5.1 General .7
5.5.2 Equipment .7
5.5.3 Procedure .8
5.5.4 Acceptance criteria .8
5.6 Coating flexibility .8
5.7 Abrasion resistance . . .9
5.8 Impact test .9
6 Sealing material requirements . 9
6.1 Chemical resistance .9
6.2 Salt spray resistance .9
7 Qualification testing . 10
7.1 Testing agency . . .10
7.2 Test materials .10
7.3 Test specimens.10
7.4 Coating application procedures .11
7.5 Preparation of prequalification bars .11
8 Documentation .11
PROOF/ÉPREUVE
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steels for the
reinforcement and prestressing of concrete.
This second edition cancels and replaces the first edition (ISO 14656:1999), which has been technically
revised.
The main changes are as follows:
— The prescribed scope of the document (texturing surface treatment material for the preparation of
fusion-bonded epoxy-coated steel bar, wire and welded fabric) has been added (see Clause 1);
— The version numbers of the referenced standards have been updated (see Clause 2);
— The terms and definitions related to texturing surface treatment material have been added (see 3.3; 3.4;
4.1.2);
— The requirements for sealing material have been modified (see 3.5; 4.2);
— The requirements for appearance and storage have been added (see 5.1);
— The requirements for coating thickness after curing have been modified (see 5.5.2.3);
— The requirements for coating flexibility have been added (see 5.6);
— The technical requirements for abrasion resistance of composite epoxy abrasive coatings have been
added (see 5.7).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
PROOF/ÉPREUVE
iv
International Standard ISO 14656:2026(en)
Steel — Epoxy powder and sealing material for the coating of
steel for the reinforcement of concrete
1 Scope
This document specifies requirements for epoxy powders and texturing surface treatment material for
use in preparing fusion-bonded epoxy-coated steel reinforcing bar, wire and welded fabric. It also includes
requirements for sealing material used to repair damaged areas and cut ends on reinforcing steel.
This document defines a flexible (type A) coating and a nonflexible (type B) coating. The adhesion and
moisture resistance of fusion-bonded epoxy powder coatings can be enhanced by certain formulation
designs. These coating enhancements typically result in a reduction of the coating’s flexibility.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6272-1, Paints and varnishes — Rapid-deformation (impact resistance) tests — Part 1: Falling weight test,
large-area indenter
ISO 6272-2, Paints and varnishes — Rapid-deformation (impact resistance) tests — Part 2: Falling weight test,
small-area indenter
ISO 9352, Plastics — Determination of resistance to wear by abrasive wheels
ISO 14654, Epoxy-coated steel for the reinforcement of concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
disbonding
loss of adhesion between the fusion-bonded epoxy coating and the steel reinforcing bar. wire or welded
fabric
3.2
fusion-bonded epoxy coating
coating containing pigments, thermosetting epoxy resins, crosslinking agents and other additives, which
have been applied in the form of a powder on to a clean, heated metallic substrate and fused to form a
continuous barrier
3.3
textured coating
coating formed by cured texturing surface treatment material
PROOF/ÉPREUVE
3.4
composite epoxy textured coating
composite coating formed by applying an additional layer of texturing surface treatment material to the
surface of a fusion-bonded epoxy coating
3.5
sealing material
coating system, formulated to be compatible with the fusion-bonded epoxy coating and textured coating,
used to repair damaged areas and cut ends
4 Materials
4.1 Coating material
4.1.1 Epoxy powder coating
Thermosetting epoxy powder coating material that can be used alone to form an epoxy coating or as base
powder in combination with texturing surface treatment material.
4.1.2 Texturing surface treatment material
The material used immediately after the fusion-bonded epoxy coating is an epoxy powder coating containing
pigment, thermosetting epoxy resin, crosslinking agent and other additives to improve the bonding strength
to concrete and increase the surface hardness of the coating.
4.2 Sealing material
The coating system, for use as sealing material, shall be compatible with the fusion-bonded epoxy coating or
composite epoxy textured coating, inert in concrete, and recommended by the epoxy powder manufacturer.
The sealing material shall be suitable for repairing damaged epoxy coating or composite epoxy textured
coating at the manufacturer or fabricator, or at the site.
5 Coating requirements
5.1 Appearance and storage
5.1.1 Appearance
When stirred with a stirring rod, the appearance of the coating material should have a uniform colour and
be free of lumps.
5.1.2 Storage
The coating material should be stored at 27 °C (80 °F) and 50 % relative humidity. It should be used up with
6 months.
If the storage temperature is lower than that of the construction site, the product is allowed to reach the site
temperature before the package is opened.
PROOF/ÉPREUVE
5.2 Chemical resistance
5.2.1 General
The ability of the coating to resist disbonding, blistering and corrosion in solutions that simulate potential
exposure environments shall be evaluated by immersing coated, 20 mm diameter steel reinforcing bars in
each of the following solutions:
a) deionized water;
b) an aqueous solution containing 3 % NaCl;
c) an aqueous solution containing 0,3 KOH and 0,05 N NaOH;
d) an aqueous solution containing 0,3 N KOH, 0,05 N NaOH and 3 % NaCl.
5.2.2 Type A coating
If the coating is classified as flexible, sixteen pieces of damage-free coated 20 mm diameter ribbed steel
reinforcing bar, 300 mm in length, shall be selected for testing. Also, sixteen additional coated bars shall
be bent 180°around a 100 mm diameter mandrel. The bend shall be made at a uniform rate and completed
within 5 s. The overall (developed) length of the bent coated bars shall be 300 mm. After bending, the
number of bending-induced holidays shall be determined using a 67,5 V, 80 000 Ω, wet-sponge type, direct
current holiday detector and recorded. Prior to testing, all holidays and coated bar ends shall be coated with
sealing material.
5.2.3 Type B coating
If the coating is classified as non-flexible, sixteen pieces of damage-free coated 20 mm diameter ribbed
steel reinforcing bar, 300 mm in length, shall be selected for testing. Also, sixteen additional uncoated bars
shall be bent 180° around a 100 mm diameter mandrel These bars shall then be coated according to 7.5.
The overall (developed) length of the bent, coated bars shall be 300 mm. The number of holidays shall be
determined using a 67,5 V, 80 000 Ω, wet-sponge type, direct current holiday detector and recorded. Prior to
testing, all holidays and coated bar ends shall be coated with sealing material.
5.2.4 Type A and B coatings
A 3 mm diameter hole shall be drilled through the coating of each of the thirty-two test specimens down to
the underlying steel prior to solution immersion. This hole shall be located between the transverse ribs on
the centre-line of each of the bars and at the midpoint of the bend for the bent bars.
Four straight and four bent bars shall be soaked in each solution for a period of 28 d at 55 °C ± 4 °C. The pH
of the solutions shall be checked and recorded daily and adjusted to ±0,2 pH units of initial solution value.
The bars shall be visually examined for swelling, colour changes, splitting and blisters after 28 d of solutio
...

ISO/FDISPRF 14656:2026(en)
ISO/TC17/SC16/WG16TC 17/SC 16
Secretariat: SN
Date: 2026-08-1026
Steel-- — Epoxy powder and sealing material for the coating of steel
for the reinforcement of concrete
Acier— — Poudres époxy et matériau de réparation pour le revêtement des armatures en acier pour béton
PROOF
ISO/PRF 14656:2026(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO/PRF 14656:2026(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials . 2
4.1 Coating material . 2
4.2 Sealing material . 2
5 Coating requirements. 2
5.1 Appearance and storage . 2
5.2 Chemical resistance . 2
5.3 Cathodic disbondment . 4
5.4 Salt spray resistance . 6
5.5 Chloride permeability . 7
5.6 Coating flexibility . 9
5.7 Abrasion resistance . 9
5.8 Impact test . 9
6 Sealing material requirements . 9
6.1 Chemical resistance . 9
6.2 Salt spray resistance . 10
7 Qualification testing . 10
7.1 Testing agency . 10
7.2 Test materials . 10
7.3 Test specimens . 10
7.4 Coating application procedures . 11
7.5 Preparation of prequalification bars . 11
8 Documentation . 11

iii
ISO/PRF 14656:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Field Code Changed
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
Field Code Changed
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 16, Steel wire rod
and wire products.
This second edition cancels and replaces the first edition (ISO 14656:1999), which has been technically
revised.
The main changes are as follows:
— — The prescribed scope of the document (texturing surface treatment material for the preparation of
fusion-bonded epoxy-coated steel bar, wire and welded fabric) has been added (see Clause 1Clause 1););
— — The version numbers of the referenced standards have been updated (see Clause 2Clause 2););
— — The terms and definitions related to texturing surface treatment material have been added (see 3.3;
3.4; 4.1.23.3; 3.4; 4.1.2););
— — The requirements for sealing material have been modified (see 3.5; 4.23.5; 4.2););
— — The requirements for appearance and storage have been added (see 5.15.1););
— — The requirements for coating thickness after curing have been modified (see 5.5.2.35.5.2.3););
— — The requirements for coating flexibility have been added (see 5.65.6););
— — The technical requirements for abrasion resistance of composite epoxy abrasive coatings have been
added (see 5.75.7).).
iv
ISO/PRF 14656:2026(en)
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
Field Code Changed
v
ISO/PRF 14656:2026(en)
Steel-- — Epoxy powder and sealing material for the coating of steel
for the reinforcement of concrete
1 Scope
This document specifies requirements for epoxy powders and texturing surface treatment material for use in
preparing fusion-bonded epoxy-coated steel reinforcing bar, wire and welded fabric. It also includes
requirements for sealing material used to repair damaged areas and cut ends on reinforcing steel.
This document defines a flexible (type A) coating and a nonflexible (type B) coating. The adhesion and
moisture resistance of fusion-bonded epoxy powder coatings can be enhanced by certain formulation designs.
These coating enhancements typically result in a reduction of the coating’s flexibility.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 6272-1, Paints and varnishes — Rapid-deformation (impact resistance) tests — Part 1: Falling weight test,
large-area indenter
ISO 6272-2, Paints and varnishes — Rapid-deformation (impact resistance) tests — Part 2: Falling weight test,
small-area indenter
ISO 9352, Plastics — Determination of resistance to wear by abrasive wheels
ISO 14654, Epoxy-coated steel for the reinforcement of concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
disbonding
loss of adhesion between the fusion-bonded epoxy coating and the steel reinforcing bar. wire or welded fabric
3.2 3.2
fusion-bonded epoxy coating
coating containing pigments, thermosetting epoxy resins, crosslinking agents and other additives, which have
been applied in the form of a powder on to a clean, heated metallic substrate and fused to form a continuous
barrier
3.3 3.3
textured coating
coating formed by cured texturing surface treatment material
ISO/PRF 14656:2026(en)
3.4 3.4
composite epoxy textured coating
composite coating formed by applying an additional layer of texturing surface treatment material to the
surface of a fusion-bonded epoxy coating
3.5 3.5
sealing material
coating system, formulated to be compatible with the fusion-bonded epoxy coating and textured coating, used
to repair damaged areas and cut ends
4 Materials
4.1 Coating material
4.1.1 Epoxy powder coating
Thermosetting epoxy powder coating material that can be used alone to form an epoxy coating or as base
powder in combination with texturing surface treatment material.
4.1.2 Texturing surface treatment material
The material used immediately after the fusion-bonded epoxy coating is an epoxy powder coating containing
pigment, thermosetting epoxy resin, crosslinking agent and other additives to improve the bonding strength
to concrete and increase the surface hardness of the coating.
4.2 Sealing material
The coating system, for use as sealing material, shall be compatible with the fusion-bonded epoxy coating or
composite epoxy textured coating, inert in concrete, and recommended by the epoxy powder manufacturer.
The sealing material shall be suitable for repairing damaged epoxy coating or composite epoxy textured
coating at the manufacturer or fabricator, or at the site.
5 Coating requirements
5.1 Appearance and storage
5.1.1 Appearance
When stirred with a stirring rod, the appearance of the coating material should have a uniform colour and be
free of lumps.
5.1.2 Storage
The coating material should be stored at 27 °C (80 °F) and 50 % relative humidity. It should be used up with
6 months.
If the storage temperature is lower than that of the construction site, the product is allowed to reach the site
temperature before the package is opened.
5.2 Chemical resistance
5.2.1 General
The ability of the coating to resist disbonding, blistering and corrosion in solutions that simulate potential
exposure environments shall be evaluated by immersing coated, 20 mm diameter steel reinforcing bars in
each of the following solutions:
ISO/PRF 14656:2026(en)
a) a) deionized water;
b) b) an aqueous solution containing 3 % NaCl;
c) c) an aqueous solution containing 0,3 KOH and 0,05 N NaOH;
d) d) an aqueous solution containing 0,3 N KOH, 0,05 N NaOH and 3 % NaCl.
5.2.2 Type A coating
If the coating is classified as flexible, sixteen pieces of damage-free coated 20 mm diameter ribbed steel
reinforcing bar, 300 mm in length, shall be selected for testing. Also, sixteen additional coated bars shall be
bent 180°around a 100 mm diameter mandrel. The bend shall be made at a uniform rate and completed within
5 s. The overall (developed) length of the bent coated bars shall be 300 mm. After bending, the number of
bending-induced holidays shall be determined using a 67,5 V, 80 000 Ω, wet-sponge type, direct current
holiday detector and recorded. Prior to testing, all holidays and coated bar ends shall be coated with sealing
material.
5.2.3 Type B coating
If the coating is classified as non-flexible, sixteen pieces of damage-free coated 20 mm diameter ribbed steel
reinforcing bar, 300 mm in length, shall be selected for testing. Also, sixteen additional uncoated bars shall be
bent 180° around a 100 mm diameter mandrel These bars shall then be coated according to 7.57.5. The overall
(developed) length of the bent, coated bars shall be 300 mm. The number of holidays shall be determined
using a 67,5 V, 80 000 Ω, wet-sponge type, direct current holiday detector and recorded. Prior to testing, all
holidays and coated bar ends shall be coated with sealing material.
5.2.4 Type A and B coatings
A 3 mm diameter hole shall be drilled through the coating of each of the thirty-two test specimens down to
the underlying steel prior to solution immersion. This hole shall be located between the transverse ribs on the
centre-line of each of the bars and at the midpoint of the bend for the bent bars.
Four straight and four bent bars shall be soaked in each solution for a period of 28 d at 55 °C ± 4 °C. The pH of
the solutions shall be checked and recorded daily and adjusted to ±0,2 pH units of initial solution value. The
bars shall be visually examined for swelling, colour changes, splitting and blisters after 28 d of solution
immersion. If the coating blisters or splits, the product shall be disqualified.
At the end of the 28 d test period, the adhesion of the coating to the steel reinforcing bars shall be evaluated.
Two intersecting cuts shall be made through the coating forming two 45° wedges. The coating at the
intersection of the cuts shall be lifted using a sharply pointed copper probe, 3 mm in diameter. Once the
coating is lifted from the bar surface, the coating shall be grasped with tweezers and lifted the distance the
coating can be readily lifted between the two cuts using tweezers shall be measured from the edge of the
intentional hole to the maximum disbondment point.
The coating adhesion shall be determined by the preceding process for two straight and two bent bars
immediately after removal of the bars from solution and while the coating is still moist. After 7 d of air drying
at 23 °C ± 2 °C and (50 ± 5) % relative humidity, the coating adhesion shall be determined for the remaining
two straight and two bent bars in a similar manner to that conducted immediately after removal from solution.
5.2.5 Acceptance criteria
After 28 d of solution immersion testing, the average maximum disbondment determined for 95 % of the bars
tested shall be 4 mm or less.
ISO/PRF 14656:2026(en)
5.3 Cathodic disbondment
5.3.1 General
The coating’s ability to resist loss of adhesion under an applied voltage at ambient temperature shall be
evaluated by this 168 h cathodic disbondment test.
5.3.2 Equipment
5.3.2.1 5.3.2.1 Filtered direct-current variable power supply, with a controlled voltage
output of between 0 V and 12 V and a current capacity of 200 mA.
5.3.2.2 5.3.2.2 Voltmeter, with a minimum input impedance of 10 MΩ and capable of
measuring in the range between 0 V and 2 V to the nearest 1 mV.
5.3.2.3 5.3.2.3 10 Ω shunt resistor, 0,5 watt, 1 % tolerance.
5.3.2.4 5.3.2.4 Calomel reference electrode.
5.3.2.5 5.3.2.5 Solid platinum anode, 150 mm long, 1,6 mm nominal diameter or platinized
wire, 3,2 mm nominal diameter.
5.3.2.6 5.3.2.6 Electrolyte, NaCl, a mass fraction of 3 % dissolved in distilled water.
5.3.2.7 5.3.2.7 Plexiglass beaker, 1 Il, with a plexiglass cover.
5.3.2.8 5.3.2.8 Thermometer.
5.3.2.9 5.3.2.9 Utility knife, with a sharp blade.
5.3.2.10 5.3.2.10 Coated steel reinforcing bars, each 200 mm long and free from holidays.
5.3.3 Procedure
5.3.3.1 5.3.3.1 On each test bar (5.3.2.10(5.3.2.10),), drill a 3 mm diameter hole
approximately 50 mm from one end. The hole shall be cantered between transverse ribs and just deep enough
to expose the steel over the full 3 mm diameter. Seal the end of the steel reinforcing bar closest to the hole
completely with sealing material. Drill a 3 mm diameter hole and attach a self-tapp
...