BS EN ISO 12951:2015 pdf free.Textile floor coverings一 Determination of mass loss, fibre bind and stair nosing appearance change using the Lisson Tretrad machine.
BS EN ISO 12951 specifies four methods of test of textile floor coverings (with or without an underlay, see Clause 9) using the Lisson Tretrad machine.
— test A: determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic pile carpets;
— test B: determination of stair nosing appearance change of textile floor coverings;
— test C: determination of fibre bind on synthetic loop pile carpets;
— test D: determination of fibre hind (hairiness) on needled floor coverings and floor coverings without pile.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1765. Machine-made textile floor coverings — Determination of thickness
ISO 1957, Machine-made textile floor coverings — Selection and cutting of specimens for physical tests
ISO 2424, Textile floor coverings — Vocabulary
ISO 8543, Textile floor coverings — Methods for determination of mass
ISO 9405, Textile floor coverings — Assessment of changes in appearance
EN 1307, Textile floor coverings — Classification of pile carpets
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions, in addition to those in ISO 2424, apply:
3.1 mass loss per unit area m difference between the sample mass before and after the wear test, related to the tested area Note Ito entry: See Clause 10.
4 Principle
The specimens of a textile floor covering are exposed, at constant load and slippage and for a prescribed number of double passages, to the action of a four-footed wheel (Tretrad), the feet of which are fitted with interchangeable rubber soles.
5 Apparatus
5.1 Lisson Tretrad machine
5.1.1 General
A Lisson Tretrad machine comprises of a bed plate, a vacuum cleaning system, and two Tretrad assemblies (see Figure 1).BS EN ISO 12951 pdf free download.