BS EN 423-2002 pdf download.Resilient floor coverings Determination of resistance to staining.
This BS EN 423 specifies a method for determining the resistance of a resilient floor covering to those chemical substances it is likely to experience in service.
2 Principle
Various chemical substances In liquid or paste form are placed on a test piece for defined periods and removed. After cleaning has been carried out the resulting change of appearance is assessed under specified lighting conditions.
3 Apparatus and materials
3.1 Standard laboratory equipment
a) pipettes;
b) spatulas.
3.2 Untreated glass fibre fabric, of mass per unit area (300 to 400) g/m2 and diameter approximately
40 mm.
3.3 Chemical substances in liquid or paste form, to be agreed between the interested parties.
3.4 Standard cleaning and stain removal products.
3.4.1 WhIte cotton, in pad or cloth form.
3.4.2 Brushes, hard, unlikely to score the surface.
3.4.3 Warm water, used alone or with the following:
a) synthetic detergent. e.g. sodium alkylsulfate:
b) soap:
C) alkaline products, e.g. washing soda or ammonia solution:
d) hydrogen peroxide;
e) sodium hypochionte;
Abrasive scouring pads, steel wool No. 00 or scouring powder, or abrasive papers, grain size P 240 or finer, used with water.
3.6 Special cleaning products, special products, recommended by the floor covering manufacturer.
3.7 Illumination device, comprising a lamp of correlated colour temperature 5 500 K to 6 500 K, mounted to give an intensity of light at the viewing p4atform of (1500± 100) lx and in such a way as to illuminate the test piece vertically from above. The surroundings shall be neutral and darkened.
The intensity of the light shall be checked frequently by the use of a luxometer. The lifetime of the lamp, as given by the manufacturer, shall not be exceeded.
3.8 Rotary viewing table, enabling the test piece to be rotated so that it may be viewed from all directions under the standard illumination.
4 Sampling and preparation of test pieces
Take a representative sample from the available material.
Take one test piece in the colour(s) to be used with a surface area of at least 3 000 mm2 for each stain to be tested. It the test uses a substance likely to cause swelling or deformation of the test piece, e.g. prolonged contact with a solvent, bond the test piece to a fibre-cement sheet at least five days before testing.
Subject the test piece to any treatment required, e.g. light abrasion to remove surface polish or application of a non-specified maintenance product.
Identify the positions corresponding to each of the substances used, either by marking numbers on the test piece (using a marking which is not affected by the material used in the test), or by a sketch, diagram or photograph.
5 Procedure
5.1 Application of liquid substances
Place the fabric (3.2) on the surface of the test specimen and saturate it with 1 ml to 2 ml of the test liquid. Leave
the fabric in place for the duration of the test.
5.2 Application of paste substances
With a spatula, spread about 1 000 mm3 over an area Of 300 mm2 to 400 mm2, (i.e. thickness 2,5 mm to 3 mm).
5.3 Duration of contact
The main duration of contact shall be 2 h. If a stain appears on the test piece after 2 h. a new test shall be conducted for a period of 30 min.
5.4 Types of cleaning and observation
5.4.1 Before cleaning, remove stains that are still liquid with cotton, working from the edge towards the centre of the stain. Scrape off the remains of paste with a spatula and wipe with cotton as above.
After cleaning has been carried out, examine the residual staining from a distance of approximately 800 mm at an approximate angle of 450 and from all directions by slowly rotating the viewing table.
5.4.2 If a stain is visible, rub it down with a mild abrasive material or a cleaning product recommended by the manufacturer. and examine as described in 5.4.1.
NOTE It white spirit or turpentine are used, these should be rinsed off with denatured ethanol.
6 Expression of results
Express the results in accordance with Table 1.BS EN 423-2002 pdf download.