| abstract |
A retro-reflective article having a retro-reflectivity of at least 400 candle power per foot candle per square foot when measured by a detector at an angle of 0.2 degrees divergence from an incident light beam and having a plurality of cube-corner retro-reflecting units and septa embossed on one surface, the septa being disposed to divide said surface into a multiplicity of separate sealable cells with a plurality of units in each cell. |