SIST EN ISO 8504-2:2002

SLOVENSKI STANDARD
SIST EN ISO 8504-2:2002
01-september-2002
Priprava jeklenih podlag pred nanašanjem barv in sorodnih pripravkov - Postopki
priprave površine - 2. del: Peskanje z abrazivi (ISO 8504-2:2000))
Preparation of steel substrates before application of paints and related products -
Surface preparation methods - Part 2: Abrasive blast-cleaning (ISO 8504-2:2000)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Verfahren für die Oberflächenvorbereitung - Teil 2: Strahlen (ISO 8504-2:2000)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Méthodes de préparation des subjectiles - Partie 2: Décapage par projection
d'abrasif (ISO 8504-2:2000)
Ta slovenski standard je istoveten z: EN ISO 8504-2:2001
ICS:
25.220.10 Priprava površine Surface preparation
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
SIST EN ISO 8504-2:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8504-2:2002

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SIST EN ISO 8504-2:2002
EUROPEAN STANDARD
EN ISO 8504-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2001
ICS 25.220.10
English version
Preparation of steel substrates before application of paints and
related products - Surface preparation methods - Part 2:
Abrasive blast-cleaning (ISO 8504-2:2000)
Préparation des subjectiles d'acier avant application de Vorbereitung von Stahloberflächen vor dem Auftragen von
peintures et de produits assimilés - Méthodes de Beschichtungsstoffen - Verfahren für die
préparation des subjectiles - Partie 2: Décapage par Oberflächenvorbereitung - Teil 2: Strahlen (ISO 8504-
projection d'abrasif (ISO 8504-2:2000) 2:2000)
This European Standard was approved by CEN on 7 March 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8504-2:2001 E
worldwide for CEN national Members.

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SIST EN ISO 8504-2:2002
Page 2
EN ISO 8504-2:2001
Foreword
The text of the International Standard from Technical Committee ISO/TC 35 "Paints and varnishes" of the
International Organization for Standardization (ISO) has been taken over as an European Standard by
Technical Committee CEN/TC 139 "Paints and varnishes", the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by November 2001, and conflicting national standards shall be
withdrawn at the latest by November 2001.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 8504-2:2000 has been approved by CEN as a European Standard
without any modification.
NOTE: Normative references to International Standards are listed in annex ZA (normative).

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SIST EN ISO 8504-2:2002
Page 3
EN ISO 8504-2:2001
Annex ZA
(normative)
Normative references to international publications with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of
the publication referred to applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated by (mod.), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
ISO 8502-2 1992 Preparation of steel substrates before application of EN ISO 8502-2 1999
paints and related products - Tests for the
assessment of surface cleanliness - Part 2:
Laboratory determination of chloride on cleaned
surfaces
ISO 8502-3 1992 Preparation of steel substrates before application of EN ISO 8502-2 1999
paint and related products - Tests for the
assessment of surface cleanliness - Part 3:
Assessment of dust on steel surfaces prepared for
painting (pressure-sensitive tape method)
ISO 8502-9 1998 Preparation of steel substrates before application of EN ISO 8502-2 2000
paints and related products - Tests for the
assessment of surface cleanliness - Part 9: Field
method for the conductometric de termination of
water-soluble salts
ISO 8503-1 1988 Preparation of steel substrates before application of EN ISO 8503-1 1999
paints and related products - Surface roughness
characteristics of blast-cleaned steel substrates -
Part 1: Specifications and definitions for ISO surface
profile comparators for the assessment of abrasive
blast-cleaned surfaces
ISO 8503-2 1988 Preparation of steel substrates before application of EN ISO 8503-2 1999
paints and related products - Surface roughness
characteristics of blast-cleaned steel substrates -
Part 2: Method for the grading of surface profile of
abrasive blast-cleaned steel - Comparator
procedure

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SIST EN ISO 8504-2:2002
Page 4
EN ISO 8504-2:2001
ISO 11124-1 1993 Preparation of steel substrates before EN ISO 11124-1 1997
application of paints and related products -
Specifications for metallic blast-cl eaning
abrasives - Part 1: General introduction
and classification
ISO 11124-2 1993 Preparation of steel substrates before EN ISO 11124-2 1997
application of paints and related products -
Specifications for metallic blast-cleaning
abrasives - Part 2: Chilled-iron grit
ISO 11124-3 1993 Preparation of steel substrates before EN ISO 11124-3 1997
application of paints and related products -
Specifications for metallic blast-cleaning
abrasives - Part 3: High-carbon cast-steel
shot and grit
ISO 11124-4 1993 Preparation of steel substrates before EN ISO 11124-4 1997
application of paints and related products -
Specifications for metallic blast-cleaning
abrasives - Part 4: Low-carbon cast-steel
shot
ISO 11126-1 1993 Preparation of steel substrates before EN ISO 11126-1 1997
application of paints and related products -
Specifications for non-metallic blas
t-cleaning abrasives - Part 1: General
introduction and classification
ISO 11126-3 1993 Preparation of steel substrates before EN ISO 11126-3 1997
application of paints and related products -
Specifications for non-metallic blas
t-cleaning abrasives - Part 3: Copper
refinery slag
ISO 11126-4 1993 Preparation of steel substrates before EN ISO 11126-4 1997
application of paints and related products -
Specifications for non-metallic
blast-cleaning abrasives - Part 4: Coal
furnace slag
ISO 11126-5 1993 Preparation of steel substrates before EN ISO 11126-5 1997
application of paints and related products -
Specifications for non-metallic
blast-cleaning abrasives - Part 5: Nickel
refinery slagt-cleaning abrasives - Part 5:
Nickel refinery slag
ISO 11126-6 1993 Preparation of steel substrates before EN ISO 11126-6 1997
application of paints and related products -
Specifications for non-metallic
blast-cleaning abrasives - Part 6: Iron
furnace slag
ISO 11126-7 1993 Preparation of steel substrates before EN ISO 11126-7 1997
application of paints and related products -
Specifications for non-metallic
blast-cleaning abrasives - Part 7: Fused
aluminium oxide
ISO 11126-8 1993 Preparation of steel substrates before EN ISO 11126-8 1997
application of paints and related products -
Specifications for non-metallic
blast-cleaning abrasives - Part 8: Olivine
sand

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SIST EN ISO 8504-2:2002
INTERNATIONAL ISO
STANDARD 8504-2
Second edition
2000-03-01
Preparation of steel substrates before
application of paints and related
products — Surface preparation
methods —
Part 2:
Abrasive blast-cleaning
Préparation des subjectiles d'acier avant application de peintures et de
produits assimilés — Méthodes de préparation des subjectiles —
Partie 2: Décapage par projection d'abrasif
Reference number
ISO 8504-2:2000(E)
©
ISO 2000

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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
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ii © ISO 2000 – All rights reserved

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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative references .1
3 Terms and definitions .3
4 Abrasives.3
5 Abrasive blast-cleaning methods .6
6 Procedure .10
Annex A (informative) International Standards for metallic and non-metallic blast-cleaning abrasives.12
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 8504 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8504-2 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 8504-2:1992), which has been updated and
editorially revised.
ISO 8504 consists of the following parts, under the general title Preparation of steel substrates before application of
paints and related products — Surface preparation methods:
� Part 1: General principles
� Part 2: Abrasive blast-cleaning
� Part 3: Hand- and power-tool cleaning
Further parts are planned.
Annex A of this part of ISO 8504 is for information only.
iv © ISO 2000 – All rights reserved

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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
Introduction
The performance of protective coatings of paint and related products applied to steel is significantly affected by the
state of the steel surface immediately prior to painting. The principal factors that are known to influence this
performance are:
a) the presence of rust and mill scale;
b) the presence of surface contaminants, including salts, dust, oils and greases;
c) the surface profile.
International Standards ISO 8501, ISO 8502 and ISO 8503 have been prepared to provide methods of assessing
these factors, while ISO 8504 provides guidance on the preparation methods that are available for cleaning steel
substrates, indicating the capabilities of each in attaining specified levels of cleanliness.
These International Standards do not contain recommendations for the protective coating system to be applied to
the steel surface. Neither do they contain recommendations for the surface quality requirements for specific
situations even though surface quality can have a direct influence on the choice of protective coating to be applied
and on its performance. Such recommendations are found in other documents such as national standards and
codes of practice. It will be necessary for the users of these International Standards to ensure the qualities
specified are
� compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the
protective coating system to be used;
� within the capability of the cleaning procedure specified.
The four International Standards referred to below deal with the following aspects of preparation of steel substrates:
ISO 8501 — Visual assessment of surface cleanliness;
ISO 8502 — Tests for the assessment of surface cleanliness;
ISO 8503 — Surface roughness characteristics of blast-cleaned steel substrates;
ISO 8504 — Surface preparation methods.
Each of these International Standards is in turn divided into separate parts.
The primary objective of surface preparation is to ensure the removal of deleterious matter and to obtain a surface
that permits satisfactory adhesion of the priming paint to steel. It should also assist in reducing the amounts of
contaminants that initiate corrosion.
This part of ISO 8504 describes abrasive blast-cleaning methods. It should be read in conjunction with ISO 8504-1.
Abrasive blast-cleaning is a most effective method for mechanical surface preparation. It is widely applicable
because this method of surface preparation has a number of versatile features listed below.
a) The method allows a high production rate.
b) The equipment can be stationary or mobile and is adaptable to the objects to be cleaned.
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
c) The method is applicable to most types and forms of steel surface.
d) Many different surface states can be produced, for example different preparation grades and surface profiles.
e) Effects such as cleaning, peening, roughening, levelling and lapping can be produced.
f) It is possible to remove selectively partly failed coatings, leaving sound coatings intact.
vi © ISO 2000 – All rights reserved

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SIST EN ISO 8504-2:2002
INTERNATIONAL STANDARD ISO 8504-2:2000(E)
Preparation of steel substrates before application of paints and
related products — Surface preparation methods —
Part 2:
Abrasive blast-cleaning
WARNING — The procedures described in this part of ISO 8504 are intended to be carried out by suitably
trained and/or supervised personnel. The substances and procedures used in these methods may be
injurious to health if adequate precautions are not taken. Attention is drawn in the text to certain specific
hazards. This part of ISO 8504 refers only to the technical suitability of the methods and does not absolve
the user from statutory obligations relating to health and safety.
1 Scope
This part of ISO 8504 describes abrasive blast-cleaning methods for the preparation of steel surfaces before
coating with paints and related products. It also contains information on the effectiveness of the individual methods
and their fields of application.
ISO 8504 is applicable to new and corroded steel surfaces and to steel surfaces that are uncoated or have been
previously coated with paints and related products. For limitations, see note 2.
NOTE 1 These methods are essentially intended for hot-rolled steel to remove mill scale, rust, etc., but could also be used
for cold-rolled steel of sufficient thickness to withstand the deformation caused by the impact of abrasive.
NOTE 2 There are several items that should be included in the purchaser's procurement documents to supplement this part
of ISO 8504. Items that should be considered as a part of surface preparation before coating are edge grinding, removal of
grease and oil, porosity of welds, removal of weld spatter, removal of burrs and other sharp edges, grinding of welds, filling of
pits and other surface imperfections that may cause premature failure of the coating system (see ISO 8501-3 for more
information) and the removal of water-soluble contaminants.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 8504. For dated references, subsequent amendments to, or revisions of any of these publications
do not apply. However, parties to agreements based on this part of ISO 8504 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 4628-3:1982, Paints and varnishes — Evaluation of degradation of paint coatings — Designation of intensity,
quantity and size of common types of defect — Part 3: Designation of degree of rusting.
ISO 8501-1:1988, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and
of steel substrates after overall removal of previous coatings.
ISO 8501-1:1988/Suppl:1994, Preparation of steel substrates before application of paints and related products —
Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
substrates and of steel substrates after overall removal of previous coatings — Informative Supplement:
Representative photographic examples of the change of appearance imparted to steel when blast-cleaned with
different abrasives.
ISO 8501-2:1994, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 2: Preparation grades of previously coated steel substrates after
localized removal of previous coatings.
1)
ISO 8501-3:— , Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 3: Preparation grades of welds, cut edges and other areas with surface
imperfections.
ISO/TR 8502-1:1991, Preparation of steel substrates before application of paints and related products — Tests for
the assessment of surface cleanliness — Part 1: Field test for soluble iron corrosion products.
ISO 8502-2:1992, Preparation of steel substrates before application of paints and related products — Tests for the
assessment of surface cleanliness — Part 2: Laboratory determination of chloride on cleaned surfaces.
ISO 8502-3:1992, Preparation of steel substrates before application of paints and related products — Tests for the
assessment of surface cleanliness — Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-
sensitive tape method).
ISO 8502-9:1998, Preparation of steel substrates before application of paints and related products — Tests for the
assessment of surface cleanliness — Part 9: Field method for the conductometric determination of water-soluble
salts.
ISO 8502-10:1999, Preparation of steel substrates before the application of paints and related products — Tests
for the assessment of surface cleanliness — Part 10: Field method for the titrimetric determination of water-soluble
chloride.
ISO 8503-1:1988, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface
profile comparators for the assessment of abrasive blast-cleaned surfaces.
ISO 8503-2:1988, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of
abrasive blast-cleaned steel — Comparator procedure.
ISO 8504-1:2000, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 1: General principles.
ISO 8504-3:1993, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 3: Hand- and power-tool cleaning.
ISO 11124 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for metallic blast-cleaning abrasives.
ISO 11126 (all parts), Preparation of steel substrates before application of paints and related products —
Specifications for non-metallic blast-cleaning abrasives.
NOTE The titles of all parts of ISO 11124 and of ISO 11126 are listed in annex A for information.
1) To be published.
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
3 Terms and definitions
For the purposes of this part of ISO 8504, the following terms and definitions apply:
3.1
abrasive blast-cleaning
impingement of a high-kinetic-energy stream of abrasive on to the surface to be prepared
NOTE The abrasive is typically propelled either by centrifugal force or by a high-velocity stream of fluid such as air or water
to remove rust, mill scale, existing coatings and other contaminants and expose the substrate. The cleaned surface has a
characteristic secondary profile dependent on the blast-cleaning conditions, the properties of the abrasive, the initial condition of
the surface and the properties of the steel being blast-cleaned. The initial surface roughness or primary profile may be altered
by the abrasive blast-cleaning procedure. Surface profiles are assessed using the method described in ISO 8503-2. When
selecting a surface preparation method, it is necessary to consider the preparation grade required to give a level of surface
cleanliness and, if required, a surface profile (roughness), such as coarse, medium or fine (see ISO 8503-1 and ISO 8503-2),
appropriate to the coating system to be applied to the steel surface. Since the cost of surface preparation is usually in proportion
to the level of cleanliness, a preparation grade appropriate to the purpose and type of coating system or a coating system
appropriate to the preparation grade which can be achieved should be chosen.
3.2
blast-cleaning abrasive
solid material intended to be used for abrasive blast-cleaning
3.3
shot
particles that are predominantly round, that have a length of less than twice the maximum particle width and that do
not have edges, broken faces or other sharp surface defects
3.4
grit
particles that are predominantly angular, that have fractured faces and sharp edges and that are less than half-
round in shape
3.5
cylindrical particles
sharp-edged particles, having a diameter-to-length ratio of 1:1, cut so that their faces are approximately at right
angles to their centreline
4 Abrasives
4.1 Materials and types
4.1.1 A wide variety of natural and synthetic solid materials and several liquids are used for abrasive blast-
cleaning. Solid materials commonly in use for the preparation of steel surfaces before coating are given in Table 1.
Each material provides a characteristic performance and surface finish.
When selecting a blast-cleaning abrasive, the following factors relating to its initial condition shall be considered:
� sub-group and type (see Table 1);
� indication of chemical composition;
� range of particle size (see 4.1.2);
� particle hardness (for example Vickers, Rockwell or Mohs, or as measured by another appropriate method).
International Standards for metallic and non-metallic blast-cleaning abrasives are listed for information in annex A.
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
4.1.2 The size and shape of the particles of an abrasive may change during use or re-use and this change can
affect the resultant surface texture of the blast-cleaned steel.
Table 1 — Commonly used blast-cleaning abrasives for steel substrate preparation
Initial particle
Compara-
Type Abbreviation shape Remarks
a
tor
(see Table 2)
Metallic (M)
Cast iron Chilled M/CI G G Mainly for
blast-cleaning
compressed-air
c
abrasives
blast-cleaning
b
S
Cast steel High-carbon M/HCS S or G
Mainly for
Low-carbon M/LCS S S centrifugal
blast-cleaning
b
Cut steel wire — M/CW C S
Non-metallic (N) Natural Olivine sand N/OL
Mainly for
blast-cleaning
Staurolite N/ST S G compressed-air
c
abrasives
blast-cleaning
Garnet N/GA G G
Synthetic Iron furnace (Calcium
slag silicate N/FE
slags)
Copper re- (Ferrous
N/CU
Mainly for
finery slag silicate
GG compressed-air
slags)
Nickel re-
blast-cleaning
N/NI
finery slag
Coal furnace (Aluminium
slag silicate N/CS
slags)
Fused aluminium oxide N/FA G G —
a
Comparator to be used when assessing the resultant surface profile. The method for evaluating the surface profile by comparator is
described in ISO 8503-2.
b
Certain types of abrasive rapidly change their shape when used. As soon as this happens, the appearance of the surface profile
changes and becomes closer to that of the "shot" comparator.
c
International Standards for the range of abrasives given here are listed in annex A: the ISO 11124 series for metallic blast-cleaning
abrasives and the ISO 11126 series for non-metallic blast-cleaning abrasives.
Table 2 — Initial particle shape
Designation and initial particle shape Symbol
Shot — round S
Grit — angular, irregular G
Cylindrical — sharp-edged C
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SIST EN ISO 8504-2:2002
ISO 8504-2:2000(E)
4.2 General requirements
4.2.1 Technical
Abrasives shall be dry (except when added to pressurized liquid or slurry blast-cleaning systems) and shall be free-
flowing to permit consistent metering into the blast stream.
Abrasives shall meet the requirements specified in the ISO 11124 and ISO 11126 series of standards and b
...