ISO 17749:2018

INTERNATIONAL ISO
STANDARD 17749
First edition
2018-05
Thermal insulation products — Sheep
wool mat and board — Specification
Produits d'isolation thermique — Panneaux et tapis en laine de
mouton — Spécifications
Reference number
ISO 17749:2018(E)
©
ISO 2018

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ISO 17749:2018(E)

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© ISO 2018
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Published in Switzerland
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ISO 17749:2018(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
4.1 Symbols . 2
4.2 Abbreviated terms . 3
5 Requirements . 3
5.1 General . 3
5.2 Material properties . 3
5.2.1 Thermal resistance and thermal conductivity . 3
5.2.2 Length and width . 4
5.2.3 Thickness . 4
5.2.4 Reaction to fire . 5
5.2.5 Moisture content . 5
5.3 Specific requirements . 5
5.3.1 Apparent density . 5
5.3.2 Sound absorption . 5
5.3.3 Formaldehyde release . 5
5.3.4 Thickness recovery ratio . 5
6 Test methods . 6
6.1 Sampling . 6
6.2 Conditioning . 6
6.3 Procedure . 6
6.3.1 General. 6
6.3.2 Thermal resistance and thermal conductivity . 7
7 Designation code . 7
8 Product conformity . 7
8.1 General . 7
8.2 Initial type testing . 8
8.3 Factory production control . 8
9 Marking and labelling . 8
Annex A (normative) Determination of the declared values of thermal resistance and
thermal conductivity . 9
Annex B (normative) Factory production control .11
Annex C (normative) Determination of the thermal conductivity in relation to moisture content 12
Annex D (normative) Thickness-recovery ratio test method .14
Annex E (informative) Evaluation of conformity .16
Bibliography .17
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ISO 17749:2018(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
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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
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URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use
in the built environment, Subcommittee SC 3, Thermal insulation products.
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INTERNATIONAL STANDARD ISO 17749:2018(E)
Thermal insulation products — Sheep wool mat and board
— Specification
1 Scope
This document specifies requirements for factory-made products of sheep wool, which are used for
the thermal insulation of buildings. This document applies to material containing more than 50 % (by
mass) natural sheep wool, with the balance being polymeric material. The products are delivered as a
mat or board with or without facings.
This document describes product characteristics and testing methods, marking, labelling and
packaging.
Products covered in this document are also used in prefabricated thermal insulation systems and
composite panels; the performance of systems incorporating these products is not covered.
The sheep wool mat and board thermal insulation is not to be used when the continuous service
temperature of the substrate is outside the range of −60 °C to +80 °C.
The use of mothproof agent residues is outside the scope of this document.
This document does not address all the health and safety aspects associated with its use. It is the
responsibility of the user of this document to establish appropriate health and safety practices.
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 354, Acoustics — Measurement of sound absorption in a reverberation room
ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Heat flow meter apparatus
ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties —
Guarded hot plate apparatus
ISO 9229, Thermal insulation — Vocabulary
ISO 11654, Acoustics — Sound absorbers for use in buildings — Rating of sound absorption
ISO 11925-2, Reaction to fire tests — Ignitability of building products subjected to direct impingement of
flame — Part 2: Single-flame source test
ISO 12460-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde
emission by the 1-cubic-metre chamber method
ISO 12570, Hygrothermal performance of building materials and products — Determination of moisture
content by drying at elevated temperature
ISO 12576-1, Thermal insulation — Insulating materials and products for buildings — Conformity control
systems — Part 1: Factory-made products
ISO 29465, Thermal insulating products for building applications — Determination of length and width
ISO 29466, Thermal insulating products for building applications — Determination of thickness
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ISO 17749:2018(E)

ISO 29470, Thermal insulating products for building applications — Determination of the apparent density
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9229 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
production line
equipment that produces products in a continuous process
Note 1 to entry: For initial type test (ITT) and factory production control (FPC), each production line is
considered separately.
3.2
production unit
equipment that produces products in a discontinuous process
Note 1 to entry: For initial type test (ITT) and factory production control (FPC), units using the same process in
one factory are considered together (as one production line).
3.3
sheep wool mat
soft mat material made from natural sheep wool as the main material (>50 % by mass) with polymeric
materials added
3.4
sheep wool board
board type products with a certain degree of rigidity made from natural sheep wool as the main
material (>50 % by mass) with polymeric materials added
4 Symbols and abbreviated terms
4.1 Symbols
b width, mm
d thickness, mm
l length, mm
d nominal thickness of the product, mm
N
λ thermal conductivity, W/(m·K)
λ declared thermal conductivity, W/(m·K)
D
λ one test result of thermal conductivity, W/(m·K)
i
λ
90 % fractile with a confidence level of 90 % for the thermal conductivity, W/(m·K)
90/90
λ
mean thermal conductivity, W/(m·K)
mean
H moisture content, %
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ISO 17749:2018(E)

k factor related to the number of test results available
2
R declared thermal resistance, m ·K/W
D
2
R one test result of thermal resistance, m ·K/W
i
2
R 90 % fractile with a confidence level of 90 % for the thermal resistance, m ·K/W
90/90
3
ρ apparent density, kg/m
a
r thickness recovery ratio, %
L declared class or level for length tolerances
T declared class or level for thickness tolerances
W declared class or level for width tolerances
4.2 Abbreviated terms
SWM sheep wool mat
SWB sheep wool board
ITT initial type test
FPC factory production control
5 Requirements
5.1 General
Product properties shall be determined in accordance with Clause 6.
The test methods to be used for determination of each property are given in Table 4, which also shows
the required test specimen dimensions and the minimum number of test specimens required to give
one test result.
One test result for a product property is the average of the measured values on the number of test
specimens given in Table 4.
NOTE For FPC, see Annex B.
5.2 Material properties
5.2.1 Thermal resistance and thermal conductivity
For thermal conductivity testing, the specimen shall be conditioned according to the following:
(80 ± 2) °C to constant mass.
Thermal resistance and thermal conductivity shall be based upon measurements carried out in
accordance with ISO 8302 or ISO 8301 for thick products.
The thermal resistance and thermal conductivity shall be determined in accordance with the
procedures given in Annex A and declared by the manufacturer according to the following.
— The reference mean temperature shall be 10 °C and/or 23 °C.
— The measured values shall be expressed with three significant figures.
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ISO 17749:2018(E)

— For products of uniform thickness, the thermal resistance, R , shall always be declared. The thermal
D
conductivity, λ , shall be declared where possible. Where appropriate, for products of non-uniform
D
thickness (i.e. for sloped and tapered products), only the thermal conductivity, λ , shall be declared.
D
— The declared thermal resistance, R , and the declared thermal conductivity, λ , shall be given as limit
D D
values representing at least 90 % of the production, determined with a confidence level of 90 %.
— The value of the thermal conductivity, λ , shall be rounded up to the nearest 0,001 W/(m·K)
D 90/90
and declared as λ in levels with steps of 0,001 W/(m·K).
D
— The declared thermal resistance, R , shall be calculated from the nominal thickness, d , and the
D N
corresponding thermal conductivity, λ ·
90/90
— The value of the thermal resistance, R (when calculated from the nominal thickness, d , and the
90/90 N
2
corresponding thermal conductivity, λ ), shall be rounded down to the nearest 0,05 m ·K/W
D 90/90
2
and declared as R in levels with steps of 0,05 m ·K/W.
D
— The value of R , for those products for which only the thermal resistance is measured directly,
90/90
2
shall be rounded down to the nearest 0,05 m ·K/W and declared as R in levels with steps of
D
2
0,05 m ·K/W.
Examples of the determination of declared values of thermal resistance, R , and thermal conductivity,
D
λ , are given in Annex A.
D
Examples of the determination of declared values of thermal conductivity in relation to moisture
content λ are given in Annex C.
5.2.2 Length and width
The length, l, and width, b, sh
...