Maximum values for the coefficient of retro-reflection

Minimum values for the coefficient of Retro-reflection

Effect on the coefficient of retro-reflection of the retro-reflective material

Maximum values for the Coefficient of Retro-reflection R' [cd.m-2.lx-1]

Minimum values for the Coefficient of Retro-reflection R [cd.m-2.lx-1]

Coefficient of retro-reflection (symbol R′) means the quotient of the coefficient of luminous intensity R of a plane retro-reflecting surface and its area A

The coefficient of retro-reflection R′ is expressed in candelas per m2 per lx (cd.m–2.lx–1

The coefficient of retro-reflection R is expressed in candela per square metre per lux (cd. m-2. lx-1).

Coefficient of retro-reflection (symbol R')" means the quotient of the coefficient of luminous intensity R of a plane retroreflecting surface and its area A

Maximum values for the coefficient of retro-reflection Photometric specifications for distinctive markings or graphics of class D:

The coefficient of retro-reflection of the exposed specimen when dry shall be not less than 80 per cent of the value in Annex 7, tables 1 and 2.

Maximum values for the coefficient of retro-reflection Photometric specifications for distinctive markings or graphics of class D:

For class E marking materials the maximum values of the coefficient of retro-reflection are less or equal to 33 per cent of the values defined in Annex 7, table 2.

The coefficient of retro-reflection of the exposed specimen when dry shall be not less than 80 % of the value in annex 7, tables 1 and 2.

If visual inspection does not reveal the presence of water or in case of doubt, the coefficient of retro-reflection R' shall be measured in conformity with annex 7, the sample unit being first lightly shaken to remove excess water from the outside.