ISO 8543 pdf download.Textile floor coverings — Methods for determination of mass
1 Scope
This International Standard specifies methods for the determination of the total mass per unit area, total pile mass per unit area, and mass of pile per unit area above the substrate, and for the calculation of measured surface pile density and measured pile fibre volume ratio, of textile floor coverings.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1 39:1 973, Textiles — Standard atmospheres for conditioning and testing . ISO 1 765:1 986, Machine-made textile floor coverings — Determination of thickness . ISO 1 766:1 986, Carpets — Determination of thickness of pile above the substrate . ISO 1 957:1 986, Machine-made textile floor coverings — Sampling and cutting specimens for physical tests .
3 Definitions
For the purpose of this International Standard, the following definitions apply. 3.1 constant mass: The mass attained when successive weighings at hourly intervals over a period of 3 h do not vary by more than 1 %. 3.2 total pile mass per unit area: The mass of the pile yarn in a unit area, including that forming the base of the tufts or held in the substrate but excluding any backing compound adhering to the pile yarn, determined in equilibrium with the standard atmosphere for conditioning and testing described in clause 4. 3.3 measured surface pile density: The ratio of mass to volume of the pile above the substrate measured under a pressure of 2,0 kPa 1 ) . 3.4 measured pile fibre volume ratio: The proportion of the volume of the pile actually occupied by fibre.
4 Atmosphere for conditioning and testing
The specimens shall be conditioned and the test conducted in one of the standard atmospheres for conditioning and testing textiles specified in ISO 1 39.
6 Determination of total mass per unit area
6.1 Field of application The method is applicable to textile floor coverings including those with varying pile height or density. It can be used prior to, and in conjunction with, the methods specified in clauses 7 and 8, with which it is compatible. 6.2 Principle The mass of a measured area of textile floor coverings is determined in its entirety. 6.3 Apparatus 6.3.1 Sharp pointed knife. 6.3.2 Rule, graduated in millimetres. 6.3.3 Balance, accurate to 0,01 g. 6.4 Specimens Select the specimens according to the standard procedure specified in ISO 1 957. Cut out, using the sharp knife, at least four rectangular specimens, each at least 200 mm ¥ 200 mm, with the sides parallel with, and at right angles to, the machine production direction. NOTE — More than four specimens may be required in order to achieve the desired confidence limits (see clause 5).6.5 Preparation of specimens Lay the specimens out flat, singly and with the use-surface uppermost in the atmosphere for conditioning and testing described in clause 4, until they reach constant mass as defined in 3.1 . 6.6 Procedure 6.6.1 Determine the mass, m, in grams, of each specimen to the nearest 0,01 g. 6.6.2 Measure the length and width of each specimen on the back, to the nearest millimetre, each in four places. 6.7 Expression of results For each specimen, calculate the average length and width, in millimetres, and multiply these to obtain the area, A, in square millimetres. For each specimen, calculate the total mass per unit area, in grams per square metre, using the formula