INTERNATIONAL ISO
STANDARD 11126-4
Second edition
2018-08
Preparation of steel substrates before
application of paints and related
products — Specifications for non-
metallic blast-cleaning abrasives —
Part 4:
Coal furnace slag
Préparation des subjectiles d'acier avant application de peintures et
de produits assimilés — Spécifications pour abrasifs non métalliques
destinés à la préparation par projection —
Partie 4: Cendres fondues
Reference number
ISO 11126-4:2018(E)
© ISO 2018
ISO 11126-4:2018(E)
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ii © ISO 2018 – All rights reserved
ISO 11126-4:2018(E)
Contents Page
Foreword......................................................................................................................................................................................................................................... iv
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 2
4 Designation of abrasives............................................................................................................................................................................... 2
5 Sampling......................................................................................................................................................................................................................... 2
6 Requirements........................................................................................................................................................................................................... 3
6.1 General requirements........................................................................................................................................................................ 3
6.2 Particular requirements................................................................................................................................................................... 3
7 Identification and marking........................................................................................................................................................................ 3
8 Information to be supplied by the manufacturer or supplier................................................................................ 3
Bibliography................................................................................................................................................................................................................................. 4
© ISO 2018 – All rights reserved iii
ISO 11126-4:2018(E)
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 12, Preparation of steel substrates before application of paints and related products.
This second edition cancels and replaces the first edition (ISO 11126-4:1993), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— Tables 1 and 2 have been technically revised.
A list of all parts in the ISO 11126 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 11126-4:2018(E)
Preparation of steel substrates before application of paints
and related products — Specifications for non-metallic
blast-cleaning abrasives —
Part 4:
Coal furnace slag
WARNING — Equipment, materials and abrasives used for surface preparation can be hazardous.
It is important to ensure that adequate instructions are given and that all required precautions
are exercised.
1 Scope
This document specifies requirements for coal furnace slag abrasives, as supplied for blast-cleaning
processes. It specifies ranges of particle sizes and values for apparent density, Mohs hardness, moisture
content, conductivity of aqueous extract and water-soluble chlorides.
The requirements specified in this document apply to abrasives supplied in the "new" condition only.
They do not apply to abrasives either during or after use.
Test methods for non-metallic blast-cleaning abrasives are given in the various parts of ISO 11127.
NOTE Although this document has been developed specifically to meet requirements for preparation of
steelwork, the properties specified will generally be appropriate for use when preparing other material surfaces,
or components, using blast-cleaning techniques. These techniques are described in ISO 8504-2.
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 11127-1, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 1: Sampling
ISO 11127-2, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 2: Determination of particle size distribution
ISO 11127-3, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 3: Determination of apparent density
ISO 11127-4, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 4: Assessment of hardness by a glass slide test
ISO 11127-5, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 5: Determination of moisture
ISO 11127-6, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 6: Determination of water-soluble contaminants
by conductivity measurement
ISO 11127-7, Preparation of steel substrates before application of paints and related products — Test
methods for non-metallic blast-cleaning abrasives — Part 7: Determination of water-soluble chlorides
© ISO 2018 – All rights reserved 1
ISO 11126-4:2018(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
coal furnace slag
synthetic mineral blast-cleaning abrasive manufactured, by granulation in water, drying and sieving,
with or without mechanical crushing processes, from slag originating when coal is burned in coal-fired
power stations
Note 1 to entry: It is basically aluminium silicate.
Note 2 to entry: Slags manufactured by air cooling instead of granulation in water are generally of a different
mineral structure and are therefore not covered by this document.
4 Designation of abrasives
Coal furnace slag abrasives shall be identified by "Abrasive ISO 11126" and the abbreviation N/CS
indicating non-metallic, coal furnace slag abrasive. This shall be followed, without spaces, by an oblique
stroke and then by the symbol G to indicate the required particle shape of the abrasive, when purchased,
as grit. The designation shall be completed by numbers denoting the particle size range, in millimetres,
required (see Table 1).
EXAMPLE
Abrasive ISO 11126 N/CS/G 0,2-1,4
denotes an abrasive of the non-metallic coal furnace slag type, complying with the requirements of this part of
ISO 11126, of initial particle shape grit and particle size range 0,2 mm to 1,4 mm.
This full product designation shall be quoted on all orders.
Table 1 — Particle size distribution
0,2 0,2 0,2 0,2 0,2 0,5 0,5 1,0 1,4
Particle size rangea mm
to 0,5 to 1 to 1,4 to 2 to 2,8 to 1 to 1,4 to 2 to 2,8
oversize Sieve size mm 0,5 1 1,4 2 2,8 1 1,4 2 2,8
Residue % (mass
max. 10 10 10 10 10 10 10 10 10
fraction)
Nominal size Sieve size mm 0,2 0,2 0,2 0,2 0,2 0,5 0,5 1 1,4
Residue % (mass
min. 85 85 85 85 85 85 85 85 85
fraction)
undersize Sieve size mm 0,2 0,2 0,2 0,2 0,2 0,5 0,5 1 1,4
Through-flow % (mass
max. 5 5 5 5 5 10 10 10 10
fraction)
a By agreement between the interested parties, abrasives of different particle size ranges may be mixed together. Details
of proportions of nominal size, oversize and undersize shall be specified. The maximum particle size shall not exceed
3,15 mm and the proportion of particles less than 0,2 mm shall not exceed a mass fraction of 5 %.
5 Sampling
Sampling procedures shall be as specified in ISO 11127-1.
2 © ISO 2018 – All rights reserved
ISO 11126-4:2018(E)
6 Requirements
6.1 General requirements
Coal furnace slag abrasives shall be vitreous amorphous materials that absorb no water but may be
wetted on the surface only.
Silica in coal furnace slag abrasives shall be present as bonded silicate. The content of free crystalline
silica (such as quartz, tridimite or crystobalite) shall not exceed 1 % (mass fraction), as determined by
X-ray diffraction.
The material shall be free from corrosive constituents and adhesion-impairing contaminants.
6.2 Particular requirements
Particular requirements for coal furnace slag abrasives shall be as specified in Table 2.
Table 2 — Particular requirements for coal furnace slag abrasives
Property Requirement Test method
Particle size range and distribution See Table 1 ISO 11127-2
kg/m3 (2,4 to 2,6) × 103
Apparent density ISO 11127-3
(kg/dm3) (2,4 to 2,6)
Mohs hardnessa min. 6 ISO 11127-4
Moisture % (mass fraction) max. 0,2 ISO 11127-5
Conductivity of aqueous extract µS/cm max. 250 ISO 11127-6
Water-soluble chlorides % (mass fraction) max. 0,002 5 ISO 11127-7
a Another method for assessing hardness may be used, together with an appropriate minimum
requirement, by agreement between the interested parties.
7 Identification and marking
All supplies shall be clearly marked or identified using the appropriate designation as specified in
Clause 4, either directly or by the accompanying delivery note.
8 Information to be supplied by the manufacturer or supplier
The manufacturer or supplier shall supply, if requested, a test report detailing results for any relevant
property as determined by the appropriate method specified in Table 2.
© ISO 2018 – All rights reserved 3
ISO 11126-4:2018(E)
Bibliography
[1] ISO 8504-2, Preparation of steel substrates before application of paints and related products —
Surface preparation methods — Part 2: Abrasive blast-cleaning
4 © ISO 2018 – All rights reserved
ISO 11126-4:2018(E)
ICS 25.220.10
Price based on 4 pages
© ISO 2018 – All rights reserved
