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FINAL
DRAFT

ISO/TC 35/SC12
Secretariat: BSI
Voting begins on:
2011-11-24
Voting terminates on:
2012-01-24

INTERNATIONAL
STANDARD

ISO/FDIS
8503-1

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
Préparation des subjectiles d’acier avant application de peintures et
de produits assimilés — Caractéristiques de rugosité des subjectiles
d’acier décapés —
Partie 1: Spécifications et définitions des comparateurs viso-tactiles ISO
pour caractériser les surfaces décapées par projection d’abrasif

RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR­
TING DOCUMENTATION
...


Please see the administrative notes on page iii

Reference number
ISO/FDIS 8503-1:2011(E)

© ISO 2011

ISO/FDIS 8503-1:2011(E)

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO
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Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester
...
+ 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso
...
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...

Violators may be prosecuted
...
The final draft
was established on the basis of comments received during a parallel enquiry on the draft
...

Positive votes shall not be accompanied by comments
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© ISO 2011 – All rights reserved

iii

ISO/FDIS 8503-1:2011(E)

Contents

Page

Foreword
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vi
1

Scope
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1

3

Terms and definitions
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3

5

Ranges of the profile gradings
...
5

7

Maintenance and re-calibration of ISO surface profile comparators
...
5

Annex A (normative) Care of ISO surface profile comparators
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8

iv



© ISO 2011 – All rights reserved

ISO/FDIS 8503-1:2011(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies)
...
Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee
...
ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization
...

The main task of technical committees is to prepare International Standards
...
Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote
...
ISO shall not be held responsible for identifying any or all such patent rights
...

This second edition cancels and replaces the first edition (ISO  8503‑1:1988), which has been technically
revised
...
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
...

These International Standards do not contain provisions for the protective coating systems to be applied to the
steel surface or for the surface quality provisions 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
...

It is necessary for the users of these International Standards to ensure that the qualities specified are:
— compatible and appropriate both for the environmental conditions to which the steel is exposed and for the
protective coating system to be used;
— within the capability of the cleaning procedure specified
...

Irrespective of the procedures and the type of abrasive used for the preparation of steel substrates, the surface
after blast-cleaning consists of random irregularities with peaks and valleys that are not easily characterized
...
Thus, it is intended that the profile be identified as either dimpled (where shot abrasives
are used) or angular (where grit abrasives are used) and that it be graded as “fine”, “medium” or “coarse”,
each grade being defined by the limits specified in this part of ISO 8503
...

Particular attention, however, is drawn to the fact that the grades “fine”, “medium” and “coarse” represent
different ranges in terms of roughness parameters, dependent upon whether these grades are applied to shot
abrasive or grit abrasive blast-cleaned surfaces
...
Where surface profile is particularly important,
both the grade of the surface profile (“fine”, “medium” or “coarse”) and the type of abrasive which is to be used
are to be specified
...

Requirements regarding the care of ISO surface profile comparators are given in Annex A
...
The many abrasive blast-cleaning
procedures in common use are described in ISO 8504‑2
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This part of ISO 8503 also includes definitions of the terms used in the ISO 8503 series and
requirements for the care of ISO surface profile comparators
...

NOTE 2 Where appropriate, these ISO comparators can be used for assessing the roughness profile of other abrasive
blast-cleaned substrates and, in addition, their use is not restricted solely to surfaces that are to be painted
...
For dated
references, only the edition cited applies
...

ISO  8501‑1, 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  8503‑2, 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  8503‑3, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 3: Method for the calibration of ISO surface
profile comparators and for the determination of surface profile — Focusing microscope procedure
ISO  8503‑4, Preparation of steel substrates before application of paints and related products — Surface
roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface
profile comparators and for the determination of surface profile — Stylus instrument procedure

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
...
1
surface profile
micro-roughness of a surface
NOTE
This is generally expressed as the height of the major peaks relative to the major valleys
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Characteristics of the
roughness of blast-cleaned surfaces are defined in 3
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8, 3
...
12 and in ISO 8503‑4
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2
ISO surface profile comparator
planar plate of four segments on which are imparted reference surface profiles (3
...
3) (see Clause 4)
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3
coupon
mild steel flat plate of four segments and of sufficient gauge such that blast-cleaning does not cause distortion
3
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3
...
1) corresponding to (or simulating) surfaces obtained by abrasive blastcleaning with metallic or mineral grit
3
...
1) corresponding to (or simulating) surfaces obtained by abrasive blastcleaning with metallic shot
3
...

NOTE 2

For determination, see ISO 8503‑3
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8
mean maximum peak-to-valley height
hy
arithmetic mean of a number of determinations (not less than 20) of hy (3
...
9
sampling length
l
length of the reference line used for identifying the irregularities characterizing the surface roughness

2



© ISO 2011 – All rights reserved

ISO/FDIS 8503-1:2011(E)

3
...
9), when using a stylus instrument
NOTE 1

The determination of Ry is described in ISO 8503‑4
...
11
mean maximum peak-to-valley height
Ry5
arithmetic mean of the maximum peak-to-valley heights, Ry (3
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9)
NOTE

Ry5 is also sometimes known as Rz DIN or Rtm
...
12
grand mean maximum peak-to-valley height
Ry5
arithmetic mean of not less than 10 determinations of Ry5 (3
...
13
primary profile
original surface profile (3
...
14
secondary profile
surface profile (3
...
13)
3
...
16
rogue peak
isolated peak, substantially higher than the surrounding peaks, normally caused by the presence of over-sized
abrasive in the abrasive mixture used during blast-cleaning with grit abrasives

4 ISO surface profile comparators
ISO surface profile comparators shall be planar and shall have the dimensions given in Figure 1
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The visual assessment (of the ISO comparator) shall not be inferior to preparation
grade Sa 2 1/2 of ISO 8501‑1
...

NOTE 1

Electro-forming has, for example, been found to give suitable products
...
Where using the stylus method (see
ISO 8503‑4), the nominal reading refers to Ry5
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NOTE 2 Other comparator designs and configurations can be used, provided four segments are included, which
conform to the profiles and tolerances specified in this part of ISO 8503
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5 Ranges of the profile gradings
The limits of profile grades, fine (G or S), medium (G or S) and coarse (G or S), are given in Table 2
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Only
ISO surface profile comparators which conform may be inscribed on the underside as described in Clause 4
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If at any time, the ISO comparator, after being calibrated using the stylus method (given in ISO 8503‑4) or
the microscope method (given in ISO  8503‑3), does not conform to the specified limits given in Table  1, it
shall be discarded
...


7 Maintenance and re-calibration of ISO surface profile comparators
Requirements regarding the care of ISO comparators are given in Annex A
...
If any wear is detected, the ISO comparator shall be discarded or,
if appropriate, re-calibrated
...
If a segment of a used ISO comparator, when
compared with the equivalent segment of an unused ISO comparator, yields a different grading assessment
(see ISO 8503‑2) of a surface profile, the used ISO comparator should be discarded or re-calibrated
...

© ISO 2011 – All rights reserved



5

ISO/FDIS 8503-1:2011(E)

Dimensions in millimetres, with a tolerance of ±0,5 mm

1

≥1

3,5

M

M

3,5

R
15

3

1

88
85

∅25

2

4

88
85

Figure 1 — ISO surface profile comparator

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© ISO 2011 – All rights reserved

ISO/FDIS 8503-1:2011(E)

Annex A
(normative)
Care of ISO surface profile comparators

The ISO comparator shall be treated as carefully as any other accurate instrument
...

Never place the ISO comparator face down on rough surfaces, despite the protection strips
...

If the ISO comparator becomes wet, dry it with soft tissues
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© ISO 2011 – All rights reserved



7

ISO/FDIS 8503-1:2011(E)

Bibliography
[1]

ISO  4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters

[2]

ISO 8504-2, Preparation of steel substrates before application of paints and related products — Surface
preparation methods — Part 2: Abrasive blast-cleaning

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© ISO 2011 – All rights reserved

ISO/FDIS 8503-1:2011(E)

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Title: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces
Description: ISO 8503‑1 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 8503‑1:1988), which has been technically revised. ISO 8503 consists of the following parts, under the general title 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 — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure — Part 3: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Focusing microscope procedure — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Stylus instrument procedure — Part 5: Replica tape method for the determination of the surface profile

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