CHAPTER II

Textiles are characterised by the characteristic factor K. This factor takes the stretchability and force per unit area of the product measured into account and is defined by the following formula: K = ε(G_(A) 2,2 Nm2), where ε is the relative elongation of a cloth specimen 1 m wide at a tensile force of 10 N, G_(A) is the weight force per unit area of a cloth specimen in N/m^(2). Dimensions and K-factor, where applicable, within the range specified by the manufacturer for the instrument. The ranges of K-factor are given in Table 1: Table 1 Group Range of K Product I 0 < K < 2 × 10^(–2) N/m^(2) low stretchability II 2 × 10^(–2) N/m^(2) < K < 8 × 10^(–2) N/m^(2) medium stretchability III 8 × 10^(–2) N/m^(2) < K < 24 × 10^(–2) N/m^(2) high stretchability IV 24 × 10^(–2) N/m^(2) < K very high stretchability 2.2. Where the measured object is not transported by the measuring instrument, its speed must be within the range specified by the manufacturer for the instrument. 2.3. If the measurement result depends on the thickness, the surface condition and the kind of delivery (e.g. from a big roll or from a pile), corresponding limitations are specified by the manufacturer. Table 2 Accuracy class MPE I 0,125 %, but not less than 0,005 L_(m) II 0,25 %, but not less than 0,01 L_(m) III 0,5 %, but not less than 0,02 L_(m) Where L_(m) is the minimum measurable length, that is to say the smallest length specified by the manufacturer for which the instrument is intended to be used. The true length value of the different types of materials shall be measured using suitable instruments (e.g. tapes of length). Thereby, the material which is going to be measured shall be laid out on a suitable underlay (e.g. a suitable table) straight and unstretched. The instruments must ensure that the product is measured unstretched according to the intended stretchability for which the instrument is designed.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.