ISO 24335:2006
(Main)Laminate floor coverings — Determination of impact resistance
Laminate floor coverings — Determination of impact resistance
ISO 24335:2006 specifies how to determine the impact resistance of laminate floor covering elements. The test described measures the ability of the surface layer to withstand impact from both small and large objects dropped on the floor covering. The testing is destructive by means of the impact on the surface layer from one small and one larger steel ball simulating different scenarios. The force of the small steel ball and the drop height of the larger steel ball are used to define the ability for a laminate floor covering element to withstand impact.
Revêtements de sol stratifiés — Détermination de la résistance aux chocs
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 24335
First edition
2006-03-01
Laminate floor coverings —
Determination of impact resistance
Revêtements de sol stratifiés — Détermination de la résistance aux
chocs
Reference number
ISO 24335:2006(E)
©
ISO 2006
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ISO 24335:2006(E)
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ISO 24335:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Apparatus . 1
4 Test specimens . 6
4.1 General. 6
4.2 Specimens for the small-diameter ball test. 6
4.3 Specimens for the large-diameter ball test . 6
4.4 Conditioning. 6
5 Procedure . 6
5.1 Impact by small-diameter ball . 6
5.2 Impact by large-diameter ball. 8
6 Expression of results . 9
6.1 Small-diameter ball. 9
6.2 Large-diameter ball. 9
7 Test Report . 10
Bibliography . 11
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ISO 24335:2006(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 24335 was prepared by Technical Committee ISO/TC 219, Floor coverings.
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INTERNATIONAL STANDARD ISO 24335:2006(E)
Laminate floor coverings — Determination of impact resistance
1 Scope
This International Standard specifies how to determine the impact resistance of laminate floor covering
elements. The test described measures the ability of the surface layer to withstand impact from both small and
large objects dropped on the floor covering. The testing is destructive by means of the impact on the surface
layer from one small and one larger steel ball simulating different scenarios. The force of the small steel ball
and the drop height of the larger steel ball are used to define the ability for a laminate floor covering element
to withstand impact.
The precision of the method is not known. When interlaboratory data becomes available, a precision
statement will be added in subsequent revisions.
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 291, Plastics — Standard atmospheres for conditioning and testing
3 Apparatus
3.1 Conditioning chamber, in accordance with ISO 291, with a standard atmosphere of (23 ± 2) °C and
relative humidity (50 ± 5) %.
3
3.2 Polyethylene foam, thickness (2 ± 0,5) mm, density (35 ± 5) kg/m .
3.3 Small-diameter ball apparatus
3.3.1 Impact tester, consisting of an impact bolt with a 5 mm steel ball mounted at one end, which is
projected once against the surface under test by the release of a compression spring.
The spring compression force before release can be adjusted continuously from 0 N to 90 N by means of a
force-setting barrel (see Figure 1).
The newton-metre (N⋅m) scale also provided on the tester is only to be used for orientation, as the introduction
of a non-linear scale involves relatively great inaccuracies.
The compression spring is 100 mm long when released and has a constant of (1 962 ± 50) N/m. It is
compressed by drawing back the impact bolt and is held in the loaded position by a retainer which engages in
the bolt. It is released to deliver the impact blow by a release unit that withdraws the retainer.
3.3.2 Force-producing arrangement, (for example, a scale-pan and weights) capable of being suspended
from the impact bolt to exert a compressive force on the spring.
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ISO 24335:2006(E)
3.3.3 Support fixture, which clamps to the shaft of the impact tester and provides a convenient mounting
of sufficient mass for the tester to be held at right angles to the surface of the specimen and to avoid recoil
following the release of the impact bolt (see Figure 2).
3.3.4 Steel plate, having dimensions of approximately 300 mm × 300 mm × 50 mm.
3.3.5 Contrast medium, e.g. graphite, talcum, or solution of dye in alcohol, to contrast with the colour of
the surface layer of the element under test.
Dimensions in millimetres
Key
1 retainer
2 release lever
3 impact bolt
4 knob
5 steel ball
6 compression spring
7 force-setting barrel (housing)
Figure 1 — Impact tester (shown with spring compressed)
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ISO 24335:2006(E)
Dimensions in millimetres
Key
1 observation slot
2 clamp screw
3 pressure bolt
4 shaft of impact tester
5 3 000 g
6 foot
7 steel ball
Figure 2 — Support fixture for impact tester
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ISO 24335:2006(E)
3.4 Large-diameter ball apparatus
3.4.1 Free-fall test apparatus, of the type shown in Figure 3, or the equivalent.
Dimensions in millimetres
Key
1 power supply
2 transformer and rectifier
3 junction box with duplex receptacle
4 angle iron brackets (Attach firmly to
wall or column. Shall be plumb and
perpendicular to the base plate.)
5 junction box with indicator light
6 19-mm mounting board for test
apparatus — medium or high density
board
7 coiled wire lead
8 6,5-mm wide slot
9 machinist's steel sliding scale,
1 800 mm long
10 electromagnet on sliding mount
11 wing nut
12 foot switch
13 460 mm × 460 mm × 19 mm steel plate
base levelled and set firmly to the floor
Figure 3 — Free-fall test apparatus
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ISO 24335:2006(E)
3.4.2 Polished stainless steel ball, with a mass of (224 ± 3) g, a diameter of 38,1 mm and no damaged or
flattened surfaces.
3.4.3 Clamping jig, capable of holding the test specimen flat or the equivalent. See Figure 4.
Dimensions in millimetres
Key
1 base
2 clamps
3 test specimen
Figure 4 — Example of clamping jig
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ISO 24335:2006(E)
3.4.4 Marking pen, black, water-washable marking pen (suitable for overhead transparencies).
3.4.5 Cloth, clean, damp, soft, white cloth.
3.4.6 Fluorescent light, overhead white fluorescent lights with bulb(s) positioned parallel to the line of sight
and providing an intensity of 800 lx to 1 100 lx (75 foot-candles to 100 foot-candles) on the specimen surface.
4 Test specimens
4.1 General
Take, from five laminate floor covering elements, the materials to be tested. If the laminate floor covering
element is equipped with a factory-applied underlay, all tests shall be carried out with this material kept on, i.e.
no pre-attached underlay material must be taken off prior to testing. The material shall be tested in
accordance with the manufacturer's intention for installation in order to simulate as real in situ situations as
possible.
4.2 Specimens for the small-diameter ball test
Take, from each of the five elements, one test specimen having dimensions of approximately
180 mm × 180 mm. In the case of width smaller than 180 mm, the dimensions shall be
...
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