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International
Standard
ISO 24342
Fourth edition
Resilient and textile floor
2024-06
coverings — Determination of
side length, edge straightness and
squareness of tiles and planks
Revêtements de sol résilients et textiles — Détermination de la
longueur des bords, de la rectitude des arêtes et de l’équerrage
des dalles et des lames
Reference number
© ISO 2024
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Reference plate .2
5.2 Rigid metal or glass plate .3
5.3 Flat bedplate apparatus . .3
5.4 Dial gauge, calliper gauge and/or thickness gauges .5
5.5 Movable dial gauges apparatus . .5
6 Sampling and selection of specimens . 6
7 Atmosphere for conditioning and testing . 6
7.1 Resilient floor coverings .6
7.2 Textile floor coverings .7
8 Procedure . 7
8.1 General .7
8.2 Side length .7
8.2.1 Gauge method .7
8.2.2 Movable dial gauge method .7
8.2.3 Sliding calliper method . . .8
8.3 Edge straightness .8
8.3.1 Thickness gauge method .8
8.3.2 Movable dial gauge method .8
8.4 Squareness .9
8.4.1 Thickness gauge method .9
8.4.2 Movable dial gauge method .9
9 Calculation and expression of the results . 9
9.1 For flat bedplate apparatus (5.3) and thickness gauge (5.4) .9
9.1.1 Side length .9
9.1.2 Edge straightness .9
9.1.3 Squareness .9
9.2 For the movable dial gauge apparatus .9
9.2.1 Tiles .9
9.2.2 Planks .9
9.3 For the sliding calliper apparatus . .10
10 Test report . 10
Bibliography .12
iii
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,
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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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 219, Floor coverings, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 134, Resilient and textile
floor coverings, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This fourth edition cancels and replaces the third edition (ISO 24342:2018), which has been technically
revised.
The main changes are as follows:
— procedures have been modified to allow for differences between planks and tiles. Clauses 3, 4, 5, 8 and 9
have therefore been updated;
— uncertainty of measurement of the records defined by dial gauges method has been changed from 0,02
mm into 0,01 mm.
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.
iv
International Standard ISO 24342:2024(en)
Resilient and textile floor coverings — Determination of side
length, edge straightness and squareness of tiles and planks
1 Scope
This document specifies methods for determining side lengths, straightness of edges and squareness of
square and/or rectangular resilient or textile floor tiles and planks.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
squareness
measurement of the amount the corner of the tile/plank deviates from 90°
Note 1 to entry: See Figure 1.
Figure 1 — Definition of squareness
3.2
straightness
property of an edge to be straight, unbent
Note 1 to entry: Some examples are shown in Figure 2.
Figure 2 — Examples of straightness – Curved and S-Bow cases
3.3
tile
plank
type of resilient or textile flooring of predetermined shape intended to be used in a modular mode
Note 1 to entry: Tiles are usually square. Planks have a ratio length divided by width superior or equal to 1,3. A
modular product with a ratio inferior to 1,3 has to be considered as a tile.
4 Principle
The side lengths, straightness and squareness of resilient or textile floor tiles and planks are important
considerations because installed flooring will have an objectionable appearance if these performance
criteria are not followed. This can cause the installed tiles/planks to line up unevenly, producing unsightly
seams and corners that do not match. The surface dimensions of a tile/plank are measured by a contact
method at defined positions in each direction.
To assess the squareness of a tile, each corner of a right-angled tile is fitted into the dihedral angle of a
precision square and the maximum gap between the arm of the square and the end of the tile is measured.
The maximum opening between the arm and the edge is measured at defined points along the edge to assess
the straightness.
To assess the squareness of a plank, place one side of the plank against a square/rectangle and slide it up
to touch the other arm. Using the thickness gauges, determine the maximum deviation from square at the
small side. The procedure is repeated on the diagonally opposite corner. The maximum opening
...