retroreflection after exposure
The test sample shall be abraded in accordance with EN530:1994,method 2, using the woolen fabric abradant. The specimens shall be measured after 5000 cycles and at a pressure of 9kPa.
The test sample shall be flexed in accordance with EN ISO 7854:1997 method A. The specimens shall be measured after reconditioning to the atmosphere for at least 2 h.
.Exposure to temperature variation
Specimens of the size of 180mm*30mm shall be exposed continuously to a cycle of changing temperatures:
a) for 12h at (50+2)℃ immediately followed by
b) 20h at (-30+2)℃
c) conditioning for at least 2h
.Washing, dry cleaning