SIST EN ISO 8291:2022

Vitreous and porcelain enamels - Method of test of self-cleaning properties (ISO 8291:1986)

Applies to enamelled walls of roasting devices, grills and baking devices; self-cleaning consists in the capacity first to absorb oil or fat in droplet form, and then to volatilize the greater part of the fat or oil by the sequential processes of distillation, decomposition, and combustion. Is not applicable to pyrolytically cleaning enamels.

Emaillierungen - Prüfung des Selbstreinigungsvermögens (ISO 8291:1986)

Émaux vitrifiés - Méthode d'essai des propriétés autonettoyantes (ISO 8291:1986)

La présente Norme internationale spécifie une méthode d'essai permettant de déterminer les propriétés des parois en émail vitrifié autonettoyant des rôtissoires, grils ou fours de cuisson, d'abord pour absorber les gouttelettes de corps gras, et ensuite pour en volatiliser la plus grande partie par un processus continu de distillation, de décomposition et de combustion (appelé dans la suite du texte «combustion» pour résumer). La présente Norme internationale n'est pas applicable aux émaux vitrifiés autonettoyants par pyrolyse.

Steklasti in porcelanski emajli - Metoda preskušanja samočistilnih lastnosti (ISO 8291:1986)

General Information

• Status: Published
• Public Enquiry End Date: 16-Aug-2022
• Publication Date: 19-Oct-2022
• ICS: 25.220.50 - Enamels
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 11-Oct-2022
• Due Date: 16-Dec-2022
• Completion Date: 20-Oct-2022
• Ref Project: EN ISO 8291:2022 - Vitreous and porcelain enamels - Method of test of self-cleaning properties (ISO 8291:1986)

Overview

EN ISO 8291:2022 - "Vitreous and porcelain enamels - Method of test of self-cleaning properties (ISO 8291:1986)" specifies a comparative test method to evaluate the self-cleaning properties of vitreous and porcelain enamelled walls used in roasting devices, grills and baking devices. The standard defines how enamel surfaces absorb oil droplets and volatilize most of the oil by distillation, decomposition and combustion. It is explicitly not applicable to pyrolytically cleaning enamels.

Key topics and technical requirements

• Test principle: Apply defined drops of testing oil to enamelled specimens, heat cycles at controlled temperature, repeat until a visible surface gloss (non-volatile residue) appears; compare the number of cycles required for test and reference specimens.
• Testing oil: Refined household soya oil (fresh, ≤3 months old); store in closed container at 5–7 °C.
• Drop volume/mass and application:
  • Drops of about 20–25 mg produced with pipette/burette/syringe (ISO 648 referenced).
  • Template with five holes (15 mm diameter) and spacing feet used to place drops from a height of 20 mm.
• Thermal cycle: Specimens exposed in a ventilated muffle furnace (hot-air oven or baking oven) at 250 ± 10 °C for 1 hour then cooled to ambient (18–28 °C). Repeat cycles until gloss appears on at least three of five exposed areas.
• Assessment and comparison:
  • Use a specially prepared reference specimen produced per ISO 2723.
  • If the difference in number of cycles to gloss between test and reference is ≤ 1 cycle, specimens are considered to have the same self-cleaning performance.
  • The method is comparative and partly subjective (visual gloss assessment); results can be affected by oven draught and oil composition.
• Quality control note: When used for QC, coating thickness of test and reference specimens should not differ by more than 20 µm; self-cleaning enamels typically have coating thickness ≥ 150 µm.

Applications and users

Who benefits from EN ISO 8291:2022:

• Enamel manufacturers and formulators validating self-cleaning vitreous and porcelain enamels.
• Appliance manufacturers (ovens, grills, roasting and baking devices) specifying enamel performance.
• Independent testing and quality control laboratories performing comparative performance tests.
• Product specifiers, procurement teams and standards bodies requiring reproducible test methods for enamelled surfaces.

Practical applications:

• Quality control during production of self-cleaning enamel finishes.
• Comparative evaluation of enamel formulations and process changes.
• Performance verification for product claims related to ease of cleaning and oil resistance.

Related standards

• ISO 2723 - Production of specimens for vitreous and porcelain enamels for sheet steel.
• ISO 648 - Laboratory glassware - One-mark pipettes.
• EN ISO 8291:2022 is the CEN endorsement of ISO 8291:1986 and is intended for adoption by CEN member national bodies.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Steklasti in porcelanski emajli - Metoda preskušanja samočistilnih lastnosti (ISO
8291:1986)
Vitreous and porcelain enamels - Method of test of self-cleaning properties (ISO
8291:1986)
Emaillierungen - Prüfung des Selbstreinigungsvermögens (ISO 8291:1986)
Émaux vitrifiés - Méthode d'essai des propriétés autonettoyantes (ISO 8291:1986)
Ta slovenski standard je istoveten z: EN ISO 8291:2022
ICS:
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8291
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 25.220.50
English Version
Vitreous and porcelain enamels - Method of test of self-
cleaning properties (ISO 8291:1986)
Émaux vitrifiés - Méthode d'essai des propriétés Emails und Emaillierungen - Prüfung des
autonettoyantes (ISO 8291:1986) Selbstreinigungsvermögens (ISO 8291:1986)
This European Standard was approved by CEN on 19 September 2022.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8291:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 8291:1986 has been prepared by Technical Committee ISO/TC 107 "Metallic and other
inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 8291:2022 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings,
including for corrosion protection and corrosion testing of metals and alloys” the secretariat of which is
held by BSI.
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 March 2023, and conflicting national standards shall
be withdrawn at the latest by March 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 8291:1986 has been approved by CEN as EN ISO 8291:2022 without any modification.

rnational St 8291
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEXAYHAPO~HAR OPrAHM3AUl4Fl i-l0 CTAH~APTL43A~MVleORGANISATlON INTERNATIONALE DE NORMALISATION
Vitreous and porcelain enamels - Method of test of
self-cleaning properties
Emaux vitrifihs - lwethode d’essai des proprih% autonetto yantes
First edition - 1986-08-15
IJDC 666.293 : 628.198 Ref. No. ISO 82914986 (E)
Descriptors : coatings, non metallic coatings, vitreous enamels, porcelain enamels, tests, determination, properties, cleaning.
Price based on 2 pages
Foreword
ISO (the International Organiration for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take patt in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 8291 was prepared by Technical Committee ISO/TC 107,
Metallic and other non-organic coatings.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Organization fbr Standardization, 1986 0
Printed in Switzerland
ISO 8291-1986 (E)
INTERNATIONAL STANDARD
Vitreous and porcelain enamels - Method of test of
self-cleaning properties
1 Scope and field of application
0 Introduction
This International Standard specifies a method of test for the
0.1 The combustion of oil or fat coming into contact with the
determination of the self-cleaning proper-Ges of vitreous and
enamelled Walls of self-cleaning roasting and baking devices is
porcelain enamelled Walls of roasting devices, grills and b
...