ISO/DIS 8130-15

Coating powders — Part 15: Rheology

This document specifies methods for the determination of the rheological behaviour of a coating powder both in particulate and molten form.

Poudres pour revêtement — Partie 15: Rhéologie

General Information

• Status: Published
• Publication Date: 30-Jan-2023
• ICS: 87.040 - Paints and varnishes
• Technical Committee: ISO/TC 35/SC 9 - General test methods for paints and varnishes
• Drafting Committee: ISO/TC 35/SC 9/WG 16 - Coating powders
• Current Stage: 6060 - International Standard published
• Start Date: 31-Jan-2023
• Due Date: 27-Apr-2023
• Completion Date: 31-Jan-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8130-15
First edition
2023-01
Coating powders —
Part 15:
Rheology
Poudres pour revêtement —
Partie 15: Rhéologie
Reference number
ISO 8130-15:2023(E)
© ISO 2023
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ISO 8130-15:2023(E)
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© ISO 2023

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© ISO 2023 – All rights reserved
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ISO 8130-15:2023(E)
Contents Page

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

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

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

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

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

4.1 Powder ........................................................................................................................................................................................................... 1

4.2 Melt ................................................................................................................................................................................................................... 1

5 Apparatus .................................................................................................................................................................................................................... 2

6 Sampling ....................................................................................................................................................................................................................... 2

7 Experimental ........................................................................................................................................................................................................... 2

7.1 Powder measurements .................................................................................................................................................................... 2

7.1.1 Fluidization measurements ...................................................................................................................................... 2

7.1.2 Fluidized bed rheology measurements .......................................................................................................... 3

7.1.3 Deaeration measurements ........................................................................................................................................ 3

7.1.4 Cohesion strength measurements ...................................................................................................................... 3

7.2 Melt rheology measurements .................................................................................................................................................... 3

8 Expression of results ....................................................................................................................................................................................... 3

9 Precision ....................................................................................................................................................................................................................... 3

10 Test report .................................................................................................................................................................................................................. 4

Annex A (informative) Interpretation of results .................................................................................................................................... 5

Bibliography .............................................................................................................................................................................................................................11

iii
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ISO 8130-15:2023(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

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expressions related to conformity assessment, as well as information about ISO's adherence to

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www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.
A list of all parts in the ISO 8130 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 8130-15:2023(E)
Introduction

The powder coating process is dependent on several material variables, whose presence within the

powder mixture is critical for ensuring smooth operation. A precise understanding of the fluidization

behaviour is important for optimal processing parameters in the fluidized bed, during pneumatic

conveyance and the spraying process. In addition, understanding the long-term stability during storage

or behavioural change during processing can also help to improve the reuse of powder coatings.

Furthermore, melt rheology is introduced to understand the melt flow properties of a given powder

coating system, to provide information after spraying, on the powder melt viscosity and gel point. The

methods in this document can be used for quality-control and detailed studies.
© ISO 2023 – All rights reserved
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INTERNATIONAL STANDARD ISO 8130-15:2023(E)
Coating powders —
Part 15:
Rheology
1 Scope

This document specifies methods for the determination of the rheological behaviour of a coating

powder both in particulate and molten form.
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 3219-1, Rheology — Part 1: Vocabulary and symbols for rotational and oscillatory rheometry

ISO 3219-2, Rheology — Part 2: General principles of rotational and oscillatory rheometry

ISO 8130-14, Coating powders — Part 14: Vocabulary

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3219-1, ISO 8130-14 and the

following 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
apparent viscosity
flow resistance of the fluidized powder bed
4 Principle
4.1 Powder

The different fluidization properties are determined in a rheometer. In addition to rotational speed

and torque, the airflow rate through the powder bed can be precisely controlled and the pressure drop

determined. This allows complete analysis of all fluidization parameters that influence the powder

coating process.
4.2 Melt

In order to characterize the powder in its molten form, a rheometer in accordance with ISO 3219-2 shall

be used to determine the melt and polymerization properties.
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ISO 8130-15:2023(E)
5 Apparatus
Use ordinary laboratory apparatus, together with the following.

5.1 Rheometer, in accordance with ISO 3219-2, equipped with a cylindrical measurement cell with

a minimum diameter of 50 mm and a minimum height of 100 mm, ideally transparent and coated with

conductive material to prevent electrostatic charging to maintain visibility. As a measurement system,

a rectangular stirrer of minimum of 10 mm × 30 mm measurement surface is recommended unless

otherwise specified.

For particulate measurements, a mass flow controller capable of generating an airflow from 0,05 l/min

to at least 5 l/min is connected to ensure a uniform fluidization. A pressure transducer is required if

pressure drop measurements shall be gathered.

For molten measurements, a disposable plate-plate geometry in a rheometer according to ISO 3219-2

with a heated plate and hood is advised.
5.2 Measurement geometry

For fluidization, deaeration and apparent viscosity measurements, use a profiled cylinder. Alternatively,

measure in an undisturbed bed, without any measurement system inserted.

For cohesion strength measurements, a rectangular stirrer with a minimum measurement surface of

10 mm × 30 mm is recommended.

Use of a disposable plate of at least 25 mm diameter is advised in molten measurements.

NOTE A plate of smaller diameter can give spurious results.
6 Sampling

Take a representative sample of the product under test as specified in ISO 15528.

A minimum sample volume for powder particulate rheology measurements of 80 ml is recommended.

For further measurements of the same powder, it is recommended to keep a consistent mass.

For melt rheology measurement, it is advised to fill the plate-plate gap with the excess particulate

powder, e.g. × 15 the volume, and then compress it prior to melting.
7 Experimental
7.1 Powder measurements
7.1.1 Fluidization measurements

Carry out the fluidization measurement using the profiled cylinder and perform it in two modes, i.e.

unstirred and stirred, e.g. rotational speed 8 min . First, decrease the air flow from 5 l/min to 0 l/min

continuously, within a minimum of 30 s and then increase again from 0 l/min to 5 l/min.

This measurement is carried out to find the volumetric flow rate i.e. the volume of gas per time

necessary for subsequent testing, as well as the volumetric flow rates for incipient and full fluidization

of the sample.

NOTE For explanations of transitions such as incipient and full fluidization, see A.1.

The measurements shall be performed
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