ISO 23767:2021

INTERNATIONAL ISO
STANDARD 23767
First edition
Children’s furniture — Mattresses for
cots and cribs — Safety requirements
and test methods
PROOF/ÉPREUVE
Reference number
ISO 23767:2021(E)
©
ISO 2021

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ISO 23767:2021(E)

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Published in Switzerland
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ISO 23767:2021(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General test conditions . 2
4.1 Preliminary preparation . 2
4.2 Application of forces . 2
4.3 Tolerances . 2
5 Test equipment. 3
5.1 Measuring table . 3
5.2 Stops . 3
5.3 Square aluminium alloy tube . 3
5.4 Loading pad . 3
5.5 Test template for determination of the indentation depth . 4
5.6 Spherical load for determination of the indentation depth . 4
5.7 Test foam . 4
5.8 Small parts cylinder . 4
5.9 Feeler gauge . 5
5.10 Cone . 5
5.11 Probe . 6
6 Chemical hazards . 6
7 Fire and thermal hazards (see A.3) . 6
8 Mechanical hazards . 6
8.1 Entrapment hazards from gaps and openings (see A.4.2) . 6
8.1.1 Entrapment hazards between the mattress and the sides . 6
8.1.2 Body entrapment hazards . 7
8.1.3 Entanglement hazards (see A.4.3) . 7
8.2 External suffocation hazards (see A.4.4) . 7
8.2.1 Labels and decals on the mattress . 7
8.2.2 Plastic packaging . 7
8.2.3 Firmness . . . 8
8.3 Choking and internal suffocation hazards (see A.4.5) .10
8.3.1 Small parts.10
8.3.2 Accessibility to filling materials .11
8.4 Hazards due to edges and protrusions (see A.4.6) .13
8.5 Structural integrity (see A.4.7) .13
8.5.1 Shrinkage .13
8.5.2 Hazards due to deformation of the filling .14
9 Product information (see A.4.8) .14
9.1 Marking .14
9.2 Purchase information .14
9.3 Instruction for use .15
Annex A (informative) Rationales .17
Annex B (informative) Colorants .20
Bibliography .21
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ISO 23767:2021(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
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 136, Furniture.
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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INTERNATIONAL STANDARD ISO 23767:2021(E)
Children’s furniture — Mattresses for cots and cribs —
Safety requirements and test methods
1 Scope
This document specifies safety requirements and test methods for mattresses, including mattress
bases and mattress toppers, used in children's cots, cribs and suspended baby beds, for domestic and
non-domestic use.
This document does not apply to mattresses for carry cots and pram bodies, inflatable mattresses,
water mattresses and mattresses used for medical purposes.
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 2439, Flexible cellular polymeric materials — Determination of hardness (indentation technique)
ISO 8124-1, Safety of toys — Part 1: Safety aspects related to mechanical and physical properties
ISO 8124-2:2014, Safety of toys — Part 2: Flammability
EN 71-3:2019, Safety of toys — Part 3: Migration of certain elements
ISO 13936-2, Textiles — Determination of the slippage resistance of yarns at a seam in woven fabrics —
Part 2: Fixed load method
EN 597-1, Furniture - Assessment of the ignitability of mattresses and upholstered bed bases — Part 1:
Ignition source smouldering cigarette
EN 1334:1996, Domestic furniture - Beds and mattresses - Methods of measurement and recommended
tolerances
EN 1730:2012, Furniture – Tables – Test methods for the determination of stability, strength and durability
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
mattress topper
thin product that comprises a cover and filling(s) designed to be used on top of a mattress
3.2
mattress base
cot base and mattress combined in one component
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ISO 23767:2021(E)

3.3
woven fabric
fabric produced by interlacing (by weaving on a loom or weaving machine) a set of warp threads and a
set of weft threads normally at right angles to each other
[SOURCE: ISO 3572:1976, 2.1]
3.4
nonwoven fabric
engineered fibrous assembly, primarily planar, which has been given a designed level of structural
integrity by physical and/or chemical means, excluding weaving, knitting or papermaking
[SOURCE: ISO 9092:2019, 3.1.1]
3.5
knitted fabric
fabric in which at least one system of threads is formed into knitted loops and the knitted loops are
intermeshed into stitches
[SOURCE: ISO 8388:1998, 3.0.1]
4 General test conditions
4.1 Preliminary preparation
The mattress shall be tested as delivered.
Unless otherwise specified, the tests shall be carried out on the same sample.
Unless otherwise specified by the manufacturer, the mattress shall be stored in indoor ambient
conditions for at least 24 h immediately prior to testing.
The tests shall be carried out at indoor ambient conditions. However, if during a test the temperature is
outside the range 15 °C to 25 °C, the maximum and/or minimum temperature shall be recorded in the
test report.
4.2 Application of forces
The test forces in durability and static load tests shall be applied sufficiently slowly to ensure that
negligible dynamic load is applied. The forces in durability tests shall be applied sufficiently slowly to
ensure that kinetic heating does not occur.
Unless otherwise stated, static forces shall be maintained for (10 ± 2) s and durability forces shall be
maintained for (2 ± 1) s.
The forces may be replaced by masses. The relationship 10 N = 1 kg shall be used.
4.3 Tolerances
Unless otherwise stated, the following tolerances shall apply:
— Forces: ±5 % of the nominal force;
— Masses: ±0,5 % of the nominal mass;
— Dimensions: ±1 mm of the nominal dimension;
— Positioning of loading pads: ±5 mm;
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ISO 23767:2021(E)

NOTE For the purposes of uncertainty measurement, test results are not considered to be adversely affected
when the above tolerances are met.
5 Test equipment
5.1 Measuring table
The measuring table shall be a horizontal, flat and smooth surface with dimensions sufficient to fully
support the mattress in any measuring position. The maximum deflection shall not exceed 1 mm when
a force of 1 000 N is applied to the table when tested in accordance with EN 1730:2012, 6.3.
5.2 Stops
Stops shall be used to prevent the mattress from sliding by a mean that does not affect the test result.
5.3 Square aluminium alloy tube
The aluminium alloy tube shall be 40 mm in width × 40 mm in height × 2 mm in thickness, approximately
2 m long, with a mass of (1,65 ± 0,0125) kg.
5.4 Loading pad
The loading pad shall be a rigid circular object 200 mm in diameter, the face of which has a convex
spherical curvature with a radius of 300 mm with a 12 mm edge radius (see Figure 1).
Dimensions in millimetres
Key
R radius
Figure 1 — Loading pad
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ISO 23767:2021(E)

5.5 Test template for determination of the indentation depth
The test template shall be made from hard smooth material with the dimensions shown in Figure 2. It
shall have a total mass of (0,26 ± 0,01) kg. The edges of the template shall be rounded with a radius of
(2 ± 0,5) mm and it shall have a hole in its centre with a diameter of (111 ± 0,5) mm, see Figure 2.
Dimensions in millimetres
Key
a
intersection view
b
top view
c
side view
R radius
Figure 2 — Test template for determination of firmness
5.6 Spherical load for determination of the indentation depth
+05,
The spherical load shall have a diameter of 115 mm and a mass of (2,5 ± 0,0125) kg.
0
5.7 Test foam
The text foam shall be a layer of flexible PU foam, corresponding to the dimensions of the mattress
3
topper to be tested, having a thickness of 100 mm, a density of (25 ± 2,5) kg/m and a hardness of
(120 ± 12) N in accordance with Method A (A ) in ISO 2439.
(40 %/30 s)
5.8 Small parts cylinder
The cylinder shall have the dimensions as shown in Figure 3.
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ISO 23767:2021(E)

Dimensions in millimetres
Figure 3 — Small parts cylinder
5.9 Feeler gauge
The feeler gauge shall have the dimensions shown in Figure 4.
Dimensions in millimetres
Key
a
side view
b
top view
R radius
Figure 4 — Feeler gauge
5.10 Cone
+01,
The cone shall have an angle of 30° ± 0,5° with a diameter of 60 mm with conical ends, see Figure 5.
0
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ISO 23767:2021(E)

Dimensions in millimetres
Figure 5 — Examples of cones
5.11 Probe
+01,
The cylindrical probe shall have a diameter of 12 mm, see Figure 6.
0
Dimensions in millimetres
Figure 6 — Cylindrical Probe
6 Chemical hazards
Verification shall be provided that the migration of heavy metals from materials on the cover of the
sleeping surface does not exceed the limits (Category III) in EN 71-3:2019, Table 2.
The migration shall be determined using the methods specified in EN 71-3.
Suggestions on colour fastness test methods are given in Annex B.
7 Fire and thermal hazards (see A.3)
A separate sample can be used.
When tested in accordance with ISO 8124-2:2014, 5.4, there shall be no surface flash, and the rate of
spread of flame of textiles, coated textiles or plastic coverings shall not exceed 50 mm/s.
When tested in accordance with EN 597-1, there shall be no progressive smouldering ignition or flaming
ignition.
NOTE In certain cases, national regulations can apply.
8 Mechanical hazards
8.1 Entrapment hazards from gaps and openings (see A.4.2)
8.1.1 Entrapment hazards between the mattress and the sides
This measurement shall be carried out before the whole test procedure.
In order to prevent entrapment hazards from gaps and openings, the tolerances on dimensions of the
mattress shall be the nominal value of width and length (+25/-0) mm.
This shall be measured in accordance with EN 1334:1996, 6.1.
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ISO 23767:2021(E)

8.1.2 Body entrapment hazards
8.1.2.1 Requirements
To avoid entrapment of the body, there shall be no gap between components of the mattress. This
requirement is fulfilled if the 60 mm cone (5.10) does not pass through the components when tested in
accordance with 8.1.2.2.
8.1.2.2 Test method
Push the 60 mm cone (5.10) between components of the mattress with a 30 N force.
8.1.3 Entanglement hazards (see A.4.3)
8.1.3.1 Requirements
The restraint system is excluded from the following requirements.
Cords, ribbons and similar parts shall have a maximum free length of 220 mm when tested in accordance
with 8.1.3.2.
Where cords, ribbons and similar parts are attached to the mattress together or within 80 mm of each
other, all single cords shall have a maximum free length of 220 mm and the combined length from one
loose end to the end of another loose end shall be maximum of 360 mm.
Loops shall have a maximum peripheral dimension of 360 mm when tested in accordance with 8.1.3.2.
8.1.3.2 Test method
The length of a cord, ribbon or similar part shall be measured from the fixing point on the mattress to
the free end of the cord, ribbon or similar part under a 25 N tensile force.
The peripheral dimension of a loop shall be measured from the fixing point on the mattress of one end
to the fixing point of the other end under a 25 N tensile force.
8.2 External suffocation hazards (see A.4.4)
8.2.1 Labels and decals on the mattress
8.2.1.1 Requirements
When tested in according to 8.2.1.2, labels and decals shall not become detached or be loosened from
the product.
8.2.1.2 Test method
Using a force of (25 ± 2) N, insert the feeler gauge (5.9) between the label or decal and the mattress at
any angle between 0° and 10° from the mattress surface.
Repeat for a further 29 times at the same position so that the feeler gauge is pushed between the label
or decal and the mattress for a total of 30 times.
8.2.2 Plastic packaging
Plastic bags and plastic sheeting used for packaging shall conform to one of the following requirements:
a) bags made of flexible plastics with an opening perimeter greater than 360 mm used for external or
internal packaging or plastic sheeting used for packaging shall have an average sheet thickness of
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ISO 23767:2021(E)

0,038 mm or more when measured in accordance with ISO 8124-1 and shall not have a drawstring
or cord as a means of closing;
b) bags made of perforated sheets or perforated plastic sheeting with an average thickness of less
than 0,038 mm when measured in accordance with ISO 8124-1 and of an area greater than 100 mm
by 100 mm shall be perforated with defined holes so that a minimum of 1 % of the area has been
removed over any area of 30 mm by 30 mm;
c) any plastic covering used as packaging that does not fulfil the previous requirements shall be
conspicuously marked in the official language(s) of the country where the mattress is sold with
a statement indicating that any plastic cover should be removed, destroyed or kept away from
children to avoid suffocation hazard.
8.2.3 Firmness
8.2.3.1 Requirement
This requirement applies to all mattress toppers, to mattresses that are more than 30 mm in thickness
as well as to mattress bases with a soft filling thickness of more than 30 mm.
When tested in accordance with 8.2.3.2, the spherical load (5.6) shall not be in complete contact with
the inner edge of the template (5.5).
8.2.3.2 Test method
8.2.3.2.1 Conditioning
Unpack the mattress and keep it flat and unloaded in an environment of (23 ± 2) °C and a relative
humidity of (50 ± 5) % for a minimum of 72 h prior to testing.
When repeating the firmness test after the test of deformation of the filling (8.5.2), the sample shall be
conditioned at least for 5 h prior to testing.
8.2.3.2.2 Procedure
Mattresses supplied with a product shall be tested using that product.
Mattresses that are supplied to consumers as stand-alone or generic replacement products shall be
placed on a horizontal, plane, rigid structure for testing.
Mattress toppers shall be placed on the test foam specified in (5.7).
Unless one side of the mattress is clearly not suitable as a sleep surface, both sides of the mattress shall
be tested if they are of different construction.
The procedure for testing shall be as follows:
a) When applicable, compress the sleep surface by agitating or shaking it so as to achieve its maximum
aerated state and an even distribution of any filling material.
b) If the sleep surface has been separated from other product components, return the sleep surface to
its normal secured position in the product, ensuring it is well supported in a horizontal orientation.
c) Allow the sleep surface to settle for at least five minutes.
d) Mark the point to be tested as follows:
Point B shall be located in the centre of the mattress.
Point C shall be located as close as possible to the edges of the mattress but the template shall be
totally in contact with the mattress.
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ISO 23767:2021(E)

Point A shall be located on a position, which represents a subjective ‘worst case’ scenario, where an
infant’s head might lay in a particularly soft spot, or an infant’s nose/mouth might contact a fold or
undulation protruding above or below the average plane of the sleep surface.
e) The test template (5.5) shall be positioned on each testing point defined in d) as shown in Figure 7.
Key
a
test template for determination of the indentation depth, see 5.5
Figure 7 — Test location
The spherical load (5.6) shall be placed in the centre of the test template. Check after 5 min if the
spherical load is in complete contact with the template (see Figures 8 and 9).
Key
1 test template
2 spherical load
3 mattress
4 test surface
Figure 8 — Test passed – The spherical load is not in complete contact with the template
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ISO 23767:2021(E)

Key
1 test template
2 spherical load
3 mattress
4 test surface
Figure 9 — Test failed – The spherical load is in complete contact with the template
8.3 Choking and internal suffocation hazards (see A.4.5)
8.3.1 Small parts
8.3.1.1 Requirements
The requirements do not apply to paper, fabric, and yarn. When tested in accordance with 8.3.1.2, no
part that can be detached shall fit wholly within the small parts cylinder (5.8).
8.3.1.2 Test method
8.3.1.2.1 General
The tests are applicable only to small parts that are considered grippable by a child and that can fit
wholly within the small parts cylinder (5.8).
A part is considered to be grippable by a child if the child can grip the part between their thumb and
forefinger or between their teeth.
The tension test (see 8.3.1.2.3) shall be carried out after the torque test (see 8.3.1.2.2) and on the same
part as used for the torque test.
8.3.1.2.2 Torque test
Apply a torque gradually to the part within a period of approximately 5 s in a clockwise direction until
either
— rotation of 180° from the original position has been attained, or
— torque of 0,34 Nm is reached.
The maximum rotation or required torque shall be applied for (10 ± 2) s.
The part shall then be allowed to return to a relaxed condition and the procedure repeated in an
anticlockwise direction.
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ISO 23767:2021(E)

Where projections, parts or assemblies are rigidly mounted on a rod or shaft designed to rotate together
with the projections, parts or assemblies, the rod or shaft shall be clamped to prevent rotation during
the test.
8.3.1.2.3 Tension test
Apply a tensile force gradually over approximately 5 s and maintain the force for (10 ± 2) s to the part
through a clamp or other suitable means. Apply a force of
— 50 N where the largest dimension is ≤6 mm, or
— 90 N where the largest dimension is >6 mm.
If the part becomes detached, check whether the part fits wholly within the small parts cylinder (5.8).
8.3.2 Accessibility to filling materials
8.3.2.1 General
The tests may be carried out on a separate sample.
8.3.2.2 Requirements
8.3.2.2.1 Mattress cover made of woven fabrics
When tested in accordance with 8.3.2.3.1, the maximum slippage of thread shall be 7 mm.
8.3.2.2.2 Mattress covers made of other materials
When tested in accordance with 8.3.2.3.2, the force of rupture shall be greater than 60 N.
8.3.2.2.3 Removable mattress covers
The means to close/attach removable covers shall not allow a child to have access to filling materials.
This requirement is met if one of the following conditions is fulfilled:
— a minimum force of 50 N is required to open the closing system;
— two actions (e.g. push and twist) are necessary to open the closing system, the first of which shall be
maintained while the second is carried out;
— two independent actions are necessary to open the closing system that shall be operated
simultaneously;
— the use of a tool is required to open the closing system;
— a non-removable in
...