AS NZS 4586:2013 pdf free download – Slip resistance classification of new pedestrian surface materials
A6.3.1 General
The test specimen shall be mounted on a horizontal surface in such a way as to prevent its movement during the tes t. For materials having a surface pattern or non-uniform texture (with regard to direction) , testing shall be carried out in the direction expected to give the lowest British Pendulum Number (BPN). ln such cases , testing in directions at 0 0 , 90 0 and 45 0 shall be carried out to determine if there is a bias due to anisotropic characteristics that may affect the reported SRV. Testing shall be in the direction most likely to result in the lowest BPN , as follows :
(a) Tiled surfaces or surfaces with many joints shall be tested at an angle of approximately 10 0 to 20 0 to the direction of the joints. NOTE: This redllces the effect of grout joints and planarity within the test specimen.
(b) Timber surfaces shall be tested parallel to the grain.
(c) When testing other highly profiled surfaces such as tactile ground surface indicators (TGS I s) , including directional indicators , the effect of the slider striking the sides of TGSIs shall be minimized. Testing shall be conducted at an angle of 30 0 to the line of indicators to maximize continuous contact with the top surface of TGSIs and minimizing slider drop-down between TGS Is.
(d) If a step tread has a slip-resistant feature strip near the nosing that has a severe profile , such as castellated blocks , the direction of the testing shall be offset by about 10.
(e) Step treads shall be tested in the direction of pedestrian movement on stair descent , that is from the back of the product towards the nosing , including as much as possible of any slip-resistant feature strip near the edge of the nosing.
NOTE: D lI e to the physical geometry of stairs it may not be possible to condllct tests in the appropriate direction on a stair tread within a stair fligh t. However , if the top nosing of a flight of stairs and the associated landing surface treatment is the same as a typical stair , testing of the landing , nosing and surface may produce a test result similar to that which could be expected on a stair tread if testing were possible. For an example of testing stair tread or stair landing nosing , see Figure A8.
NO TE : Where larger pro du cts co nta in a. sl ip – re sistant feature strip near the nos i ng , th is portion sha ll be c ut to pr ovide sufficient product fo r testi ng ; however , iftesti ng in s itu the sha ll include a portion of th e t read together wi th the nosing section , where the te st is cond ucte d 011 the landing at t he of the sta irway (see Fi gu re A8).