ISO/PRF 11125-9

Preparation of steel substrates before application of paints and related products -- Test methods for metallic blast-cleaning abrasives

Préparation des subjectiles d'acier avant application de peintures et de produits assimilés -- Méthodes d'essai pour abrasifs métalliques destinés à la préparation par projection

General Information

• Status: Published
• ICS: 25.220.10 - Surface preparation
• Technical Committee: ISO/TC 35/SC 12 - Preparation of steel substrates before application of paints and related products
• Drafting Committee: ISO/TC 35/SC 12/WG 4 - Blast-cleaning abrasives
• Current Stage: 5060 - Close of voting Proof returned by Secretariat
• Completion Date: 01-Jul-2021

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 11125-9
First edition
Preparation of steel substrates before
application of paints and related
products — Test methods for metallic
blast-cleaning abrasives —
Part 9:
Wear testing and performance
PROOF/ÉPREUVE
Reference number
ISO 11125-9:2021(E)
ISO 2021
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ISO 11125-9:2021(E)
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© ISO 2021

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Published in Switzerland
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ISO 11125-9:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Principle ........................................................................................................................................................................................................................ 3

5 Samples .......................................................................................................................................................................................................................... 3

6 Preliminary testing ............................................................................................................................................................................................ 3

7 Apparatus ..................................................................................................................................................................................................................... 3

8 Blast-cleaning abrasive testing under laboratory conditions ............................................................................... 4

8.1 Testing machines ................................................................................................................................................................................... 4

8.2 Test method procedures ................................................................................................................................................................. 4

8.2.1 100 % breakdown method...................................................................................................................................... 4

8.2.2 Full wear test (100 % replacement method) .......................................................................................... 7

8.2.3 Stabilized consumption test ................................................................................................................................... 8

9 Transmitted energy tests ..........................................................................................................................................................................10

9.1 Transmitted energy test (100 % replacement) .......................................................................................................10

9.1.1 General...................................................................................................................................................................................10

9.1.2 Test method .......................................................................................................................................................................10

9.2 Transmitted energy test (at full saturation) ...............................................................................................................10

9.2.1 General...................................................................................................................................................................................10

9.2.2 Test method .......................................................................................................................................................................10

9.2.3 Test evaluation ................................................................................................................................................................10

9.2.4 Example ................................................................................................................................................................................10

10 Test report ................................................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

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ISO 11125-9:2021(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 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 35, Paints and varnishes, Subcommittee

SC 12, Preparation of steel substrates before application of paints and related products.

A list of all parts in the ISO 11125 series can be found on the ISO website.

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.
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ISO 11125-9:2021(E)
Introduction

This document is a part of the ISO 11125 series that specifies test methods for metallic blast-cleaning

abrasives.

During blast-cleaning, metallic abrasives are subjected to repeated impacts on the substrate to be

prepared. These mechanical impacts result in abrasive material fatigue until particles breakdown.

The service life of the metallic blast-cleaning abrasives is influenced by:

— the type of abrasive, in particular, its size and shape, its resilience, its hardness and its internal

defects;
— the hardness and the surface conditions of the substrate to be prepared;
— the blasting machine and its settings.

The principle of an abrasive service life testing machine is based on a high number of impacts between

a representative sample of the abrasive to be tested and a given target.

Several testing machines exist on the market and depending on their design, the service life obtained

under laboratory conditions may or may not be comparable to field operation.

It is important that the user is aware of the different parameters and the respective adjustability. The

parameters of the testing machines can vary from one machine to another and therefore can result in

different test results.

In general, the effect of wear and consumption are tested. Special arrangements may be required for

specific test procedures. The results can be used for comparison purposes (quality inspection) or for

monitoring (quality control) of the deliveries for uniformity.
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INTERNATIONAL STANDARD ISO 11125-9:2021(E)
Preparation of steel substrates before application of paints
and related products — Test methods for metallic blast-
cleaning abrasives —
Part 9:
Wear testing and performance
1 Scope

This document specifies three procedures to test the service life of a blast-cleaning abrasive under

laboratory conditions.

The performance of an abrasive is also measured by its ability to clean, via transmission of kinetic

energy to the substrate in the blasting process. This document also specifies the procedures that can

be performed in the same testing machines to help evaluate abrasive performance under laboratory

conditions.

This document applies to the testing of virgin metallic blasting media in the delivery state by centrifugal

blasting under laboratory conditions.
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 11124-3, Preparation of steel substrates before application of paints and related products —

Specifications for metallic blast-cleaning abrasives — Part 3: High-carbon cast-steel shot and grit

ISO 11124-4, Preparation of steel substrates before application of paints and related products —

Specifications for metallic blast-cleaning abrasives — Part 4: Low-carbon cast-steel shot

ISO 11124-5, Preparation of steel substrates before application of paints and related products —

Specifications for metallic blast-cleaning abrasives — Part 5: Cut steel wire

ISO 11125-1, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 1: Sampling

ISO 11125-2, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 2: Determination of particle size distribution

ISO 11125-3, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 3: Determination of hardness

ISO 11125-4, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 4: Determination of apparent density

ISO 11125-5, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 5: Determination of percentage defective particles

and of microstructure

ISO 11125-6, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 6: Determination of foreign matter

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ISO 11125-9:2021(E)

ISO 11125-7, Preparation of steel substrates before application of paints and related products — Test

methods for metallic blast-cleaning abrasives — Part 7: Determination of moisture

ISO 12944-4, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —

Part 4: Types of surface and surface preparation

ISO 565:1990, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal

sizes of openings
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11124-3, ISO 11124-4,

ISO 11124-5, ISO 11125-1, ISO 11125-2, ISO 11125-3, ISO 11125-4, ISO 11125-5, ISO 11125-6, ISO 11125-7,

ISO 12944-4 and the following 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 https:// www .electropedia .org/
3.1
blast-cleaning abrasive
solid material intended to be used for abrasive blast-cleaning
3.2
service life
duration of the usability of the blast-cleaning abrasive (3.1)

Note 1 to entry: In this field of application the service life is given in the number of cycles in which 100 % of the

material wears. In practice, the worn material is removed from the system by ventilation, in the laboratory this

is achieved by sieving.
3.3
abrasive consumption
weight of loss of abrasive divided by the weight of thrown abrasive
Note 1 to entry: It is expressed in in g/1 000 kg.
3.4
Almen strip

UNS G10700 carbon steel specimen that is used to calibrate the energy of an abrasive stream

3.5
Almen strip holding fixture

device used to fasten Almen strips (3.4) in suitable locations that represent the position and angular

orientation of the surfaces of a part where the intensity is to be determined and verified

3.6
arc height

flat Almen strip (3.4) that, when subjected to a stream of shot moving at an adequate velocity, bends in

an arc corresponding to the amount of energy transmitted by the shot stream

Note 1 to entry: The height of the curved arc measured in millimetre is the arc height, measured by an Almen

gauge.
3.7
Almen intensity
Almen strip arc height (3.6) at saturation
Note 1 to entry: This term comes into effect only when saturation is achieved.
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ISO 11125-9:2021(E)

Note 2 to entry: Surface preparation is not solely a question of Almen intensity. Size and hardness of the blasting

media is important to achieve a good surface cleaning or a good surface roughness.

3.8
saturation

minimum number of cycles necessary to achieve the desired Almen intensity (3.7) which, when doubled

does not increase the Almen strip arc height (3.6) by more than 10 %
3.9
saturation curve

curve that plots Almen strip arc height (3.6) (ordinate) with the number of cycles (abscissa)

Note 1 to entry: See Figure 2.
3.10
transmitted energy

ability of the abrasive to transmit its kinetic energy to the substrate to perform useful work in cleaning

or preparing the surface
4 Principle

The service life of metallic blast-cleaning abrasive is determined by various factors. It is dependent

on the substrate itself, on the blasting system and its operating parameters, as well as on the blasting

media. Therefore, laboratory testing can only give an indication of the consumption or wear of the

metallic blast-cleaning abrasive.
...