FprEN 17667

SLOVENSKI STANDARD
oSIST prEN 17667:2021
01-junij-2021

Preskusna metoda - Določanje toplotne odpornosti polnjenih tekstilnih izdelkov in

Test method - Determination of thermal resistance of filled textile articles and similar

Kinderschlafsäcken, -bettdecken und -daunendecken mittels einer kleinen geschützten

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17667:2021 E

European foreword ...................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Principle ............................................................................................................................................................. 6

5 Apparatus .......................................................................................................................................................... 6

6 Conditioning ..................................................................................................................................................... 9

7 Test samples ..................................................................................................................................................... 9

8 Test procedure ................................................................................................................................................. 9

9 Test report ....................................................................................................................................................... 11

10 Accuracy and precision ............................................................................................................................... 12

Annex A (informative) Alternative method of determination of thermal resistance of air

layer ................................................................................................................................................................... 13

A.1 Determination of thermal resistance of air layer ............................................................................. 13

Annex B (informative) Guidance on labelling of thermal resistance ........................................................ 14

B.1 Guidance on labelling of thermal resistance ...................................................................................... 14

Bibliography ................................................................................................................................................................. 15

This document (prEN 17667:2021) has been prepared by Technical Committee CEN/TC 248 “Textile

This test method has been developed to provide a simple method of determining the thermal resistance

of filled textile products and similar articles using a small guarded hotplate apparatus. Other methods

such as ISO 5085-1 and EN ISO 11092 may have limitations on the range of their measurement

capability and/or require the use of complex apparatus. The apparatus used in this method is broadly

comparable with that specified in ISO 5085-1 but with a number of differences which are intended to

provide a more reliable test result. It is based on a test method British Standard BS 8510:2007 which

This test method measures thermal resistance in a similar manner to ISO 11092 when using R mode

but is a simplified version of the test method. Limited trials in the development of this test method

indicate that it has a good correlation with other test methods in use including ISO 5085-1 in single

This method of test described a means of determining the thermal resistance of textiles articles which

may be filled e.g. padded coats and jackets, child sleep bags, cot duvets, etc., or textiles articles with a

thermal resistance of up to 0,5 m K/W (5,0 tog) and/or which do not have uniform thickness.

The test method is suitable for products with a thermal resistance within the range 0,025 m K/W (0,25

tog) to approximately 0,5 m K/W (5,0 tog) but is limited only by the ability of the test apparatus to cope

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.

EN ISO 139, Textiles — Standard atmospheres for conditioning and testing (ISO 139)

ISO 8302, Thermal insulation — determination of steady state thermal resistance and related properties

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

any textile product formed of a single layer of textile or multiple layers of textile material, with or

bedding item consisting of a full length fabric bag, which may be lined or filled, with a neck opening and

armholes, designed to contain a child which may be used in conjunction with nightwear

bedding item intended to cover the child’s body, consisting of a filling material permanently sewn into a

textile over intended to be used with or without a secondary removable textile cover

ratio of the temperature difference between the two faces of a test sample to the rate of flow of heat per

ten times the temperature difference between the two faces of a sample (in K) when the heat flow

for the purpose of this test method, take the standard atmosphere as defined in EN ISO 139

The textile article to be tested is placed on a horizontal heated plate at 306 K (skin surface temperature)

and the opposite face is exposed to an ambient room temperature. The power required to maintain

thermal equilibrium (“steady state”) over a period of not less than 60 min is measured and the thermal

The apparatus shall be built and operated in accordance with the principles of ISO 8302. See Figure 1.

The apparatus for the determination of thermal resistance shall be designed so that it complies with the

a) the apparatus shall be horizontal, with the heat flow upwards and designed so that measurements

b) the surface of the upper hot face of the apparatus shall be flat, isothermal, metal and have a finish

such that the emissivity is not less than 0,9. The central measuring area shall be not less than

200 mm by 200 mm but not greater than 350 mm by 350 mm. The guard area or effective guard

c) there shall be a suitable means for measuring the temperature of the upper surface of the hot face

and of the air temperature of the air layer above the test sample to an accuracy of 0,2 K;

d) sets of at least five temperature sensors, each set uniformly distributed over the central measuring

area, shall be used to measure the upper hot face and lower hot face temperatures;

e) a set of at least five shielded temperature sensors uniformly distributed over the central measuring

area shall be used to measure the temperature of the air layer above the test sample. These shall be

located directly above the corresponding sensors in the central measuring area; (see Annex A for

f) the upper hot face temperature and the temperature of the air layer above the test sample shall be

g) the apparatus shall be located within a test environment maintained in accordance with the

standard temperate atmosphere as defined in ISO 139. The apparatus shall be screened from

external sources of heat (e.g. effects of lighting, other apparatus, etc.), and from draughts (e.g.

h) the apparatus shall be equipped with suitable instrumentation for the recording of the individual

temperatures of the upper hot face, lower hot face and air layer above the test sample and energy

required. The instrumentation shall be able to record at least 3 readings per minute;

i) the thermal resistance of the test sample plus the air layer (R ) is determined from the energy

dissipated in the central heater, the area of the central heater and the temperature difference T .

T the difference between the upper hot face temperature and the temperature of the air layer above the test

T the difference between the lower hot face temperature and the upper hot face temperature

Support frame(s) of dimensions so as to ensure the intimate contact of the under-surface of the sample

with the hotplate and support any part(s) of the test sample which is greater than the area of the

Racks of dimensions such that it is possible to place the sample to be tested horizontally or vertically

and without distortion, and for air to circulate over the whole of the upper surface of the test sample.

It is important that if samples are conditioned vertically that the sample is positioned in an orientation

that will not result in a change to the filling distribution (e.g. any filling channels should be oriented

A series of at least three separate reference materials with known thermal resistances ranging from