ISO 6370-2:2011

Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 2: Loss in mass after sub-surface abrasion

Émaux vitrifiés — Détermination de la résistance à l'abrasion — Partie 2: Perte de masse après abrasion de la couche superficielle

General Information

• Status: Withdrawn
• Publication Date: 30-Oct-2011
• Withdrawal Date: 30-Oct-2011
• ICS: 25.220.50 - Enamels
• Technical Committee: ISO/TC 107 - Metallic and other inorganic coatings
• Drafting Committee: ISO/TC 107/WG 2 - Vitreous and porcelain enamel coatings
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 10-Feb-2020

Relations

• Revised: ISO 6370-2:2020 - Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 2: Loss in mass after sub-surface abrasion
• Effective Date: 17-Feb-2018
• Revises: ISO 6370-2:1991 - Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 2: Loss in mass after sub-surface abrasion
• Effective Date: 12-Mar-2011
• Consolidated By: ISO 1043-4:1998/Amd 1:2016 - Plastics — Symbols and abbreviated terms — Part 4: Flame retardants — Amendment 1: Code numbers
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL  ISO
STANDARD 6370-2
Second edition
2011-11-01
Vitreous and porcelain enamels —
Determination of the resistance to
abrasion —
Part 2:
Loss in mass after sub-surface abrasion
Émaux vitrifiés — Détermination de la résistance à l’abrasion —
Partie 2: Perte de masse après abrasion de la couche superficielle
Reference number
ISO 6370-2:2011(E)
©
 ISO 2011

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ISO 6370-2:2011(E)
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©  ISO 2011
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ii © ISO 2011 – All rights reserved

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ISO 6370-2:2011(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6370-2 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings.
This second edition cancels and replaces the first edition (ISO 6370-2:1991), of which it constitutes a minor
revision.
ISO 6370 consists of the following parts, under the general title Vitreous and porcelain enamels — Determination
of the resistance to abrasion:
—  Part 1: Abrasion testing apparatus
—  Part 2: Loss in mass after sub-surface abrasion
© ISO 2011 – All rights reserved  iii

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ISO 6370-2:2011(E)
Introduction
Extensive tests have shown that, with the comparative method described in this part of ISO 6370, the uncertainty
of measurement of test results is ±5 %. Furthermore, absolute quantities for the amount of wear give little
information, because abrasives used in practice differ considerably in their effect on enamelled surfaces.
Each abrasion test with a standardized method can only be carried out with the aim of providing a general
classification of various vitreous and porcelain enamels in relation to each other. Absolute quantities for the
amount of wear are therefore not required.
Numerous tests have shown that the three required test periods of 30 min were sufficient to obtain comparable
results. If the vitreous and porcelain enamel coat to be tested is thicker than 0,2 mm, it is not necessary to
determine the loss in mass after each 30 min test period, because the abrasion under the conditions described
in this part of ISO 6370 is directly proportional to the test duration.
iv © ISO 2011 – All rights reserved

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INTERNATIONAL STANDARD ISO 6370-2:2011(E)
Vitreous and porcelain enamels — Determination of
the resistance to abrasion —
Part 2:
Loss in mass after sub-surface abrasion
WARNING — This International Standard may not be compliant with some countries’ health and
safety legislations and calls for the use of substances and/or procedures that may be injurious to
health if adequate safety measures are not taken. This International Standard does not address
any health hazards, safety or environmental matters and legislations associated with its use. It is
the responsibility of the user of this International Standard to establish appropriate health, safety
and environmentally acceptable practices and take suitable actions to comply with any national
and international regulations. Compliance with this International Standard does not in itself confer
immunity from legal obligations.
1 Scope
This part of ISO 6370 specifies a test method for determining the resistance of vitreous and porcelain enamel
coatings to abrasion by rubbing, grinding or other mechanical effects.
2 Normative references
The following referenced documents are indispensable for the application 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 648, Laboratory glassware — One-mark pipettes
ISO 683-17, Heat-treated steels, alloys steels and free-cutting steels — Part 17: Ball and roller bearing steels
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 6344-2, Coated abrasives — Grain size analysis — Part 2: Determination of grain size distribution of
macrogrits P12 to P220
ISO 6370-1:1991, Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 1:
Abrasion testing apparatus
ISO 28722, Vitreous and porcelain enamels — Production of specimens for testing enamel on sheet steel,
sheet aluminium and cast iron
3 Principle
Mounting of three similarly enamelled test specimens and three reference glass plates in the testing apparatus;
simultaneous exposure of the separated test specimens and reference glass plates to the abrasion attack of
a mixture of fused aluminium oxide grains, steel balls and water for three periods of 30 min; calculation of
the relative amount of wear w from the mean of the mass losses for the three test specimens and the three
r
reference glass plates.
4 Reagents
For cleaning the test specimens and the reference glass plates, use the following reagents.
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ISO 6370-2:2011(E)
4.1 Ethanol (CHOH), with a volume fraction between 96 % and 98 %.
2 5
4.2 Distilled water, or water of equivalent purity (grade 3 water complying with the requirements of ISO 3696).
5 Apparatus and materials
5.1 Abrasion testing apparatus, complying with the requirements of ISO 6370-1.
5.1.1 Balance, accurate to 0,2 mg.
5.1.2 Pipette, of nominal capacity 25 ml , at least class B, complying with the requirements of ISO 648.
5.1.3 Drying oven, capable of maintaining temperatures of at least 130 °C.
5.1.4 Desiccator, with an internal diameter of 200 mm.
5.1.5 Reference glass plates, square plates with a side length of 100 mm and thickness 3 mm, consisting
of float glass. For each test, a set of three reference glass plates is required. For identification of the float-bath
surface of the glass plates, see Annex A.
NOTE  Float glass is made by a process in which a ribbon of hot glass is floated upon a heated liquid of density greater
than that of the glass.
5.2 Material.
5.2.1 Steel balls. For each test on a set of three specimens and three reference glass plates, the following
are required (see 7.3):
—  500 g of balls that are 4 mm in diameter;
—  400 g of balls that are 3 mm in diameter;
—  250 g of balls that are 2 mm in diameter.
Balls shall consist of the same stainless steel of the type used for bearings and shall be hardened, for example,
type of steel 20 complying with the requirements of ISO 683-17.
5.2.2 Abrasives, grains of fused
...