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Photometries
Coefficients of Retroreflection (RA)
The values in Table A and B are minimum coefficients of retroreflection expressed in candelas
per lux per square meter (cd/lux/m2).
Conformance to coefficient of retro reflection requirements shall be determined by instrumental
method in accordance with ASTM E-810 “Test Method for Coefficient of Retroreflection of
Retroreflective Sheeting.
Table A - Coefficient of Retroreflection RA for new reflective sheeting (cd/lux/m2) of
YS-P3800 Series.
Entrance Angle | -4° | 30° | ||
Observation Angle | 0.2° | 0.5° | 0.2° | 0.5° |
White | 49 | 21 | 21 | 10.5 |
Yellow | 35 | 17.5 | 15.4 | 9.1 |
Orange | 17.5 | 9.1 | 4.9 | 2.8 |
Green | 6.3 | 3.15 | 2.45 | 1.54 |
Red | 9.8 | 5.25 | 4.2 | 2.1 |
Blue | 2.8 | 1.19 | 1.4 | 0.56 |
Brown | 0.7 | 0.21 | 0.21 | 0.14 |
Daytime Color (x,y,Y)
The chromaticity coordinates and total luminance factor of the retroreflective sheeting conform to
Table C Daytime Color Specifications Limit (see Note 1).
Color Test – Ordinary Colored Sheeting Conformance to standard chromaticity (x, y) and luminance factor (Y %) requirements shall be determined by instrumental method in accordance with ASTM E 1164 on sheeting applied to smooth aluminum test panels.
The values shall be determined on a spectrophotometer.
Computations shall be done for CIE Illuminant D65 and the 2° standard observer (see Note 2)
Table B
COLOR |
1 |
2 |
3 |
4 | Daytime Luminance Limit | |||||
x | y | x | y | x | y | x | y | Min. | Max. | |
White | 0.303 | 0.300 | 0.368 | 0.366 | 0.340 | 0.393 | 0.274 | 0.329 | 27 | -- |
Yellow | 0.498 | 0.412 | 0.557 | 0.442 | 0.479 | 0.520 | 0.438 | 0.472 | 15 | 25 |
Orange | 0.558 | 0.352 | 0.636 | 0.364 | 0.570 | 0.429 | 0.506 | 0.404 | 10 | 30 |
Green | 0.026 | 0.399 | 0.166 | 0.364 | 0.286 | 0.446 | 0.207 | 0.771 | 3.0 | 12 |
Red | 0.648 | 0.351 | 0.735 | 0.265 | 0.629 | 0.281 | 0.565 | 0.346 | 2.5 | 15 |
Blue | 0.140 | 0.035 | 0.244 | 0.210 | 0.190 | 0.255 | 0.065 | 0.216 | 1.0 | 10 |
Brown | 0.430 | 0.340 | 0.610 | 0.390 | 0.550 | 0.450 | 0.430 | 0.390 | 1.0 | 9 |
Note 1 : The four pairs of chromaticity coordinates determine the acceptable color in terms of the
CIE 1931 Standard Colormetric System.
Note 2 : The instrumentally determined color values of retroreflective sheeting can vary significantly depending on the make and model of colorimetric spectrophotometer as well as the color and retro-reflective optics of the sheeting.
Substrates
For traffic sign use, substrates found to be most reliable and durable are properly prepared
aluminum sheets and extrusions. Users are urged to carefully evaluate all other substrates for
adhesion and sign durability. Other substrates that may be satisfactory for proper application of
sheeting will have the following characteristics:
• Clean
• Smooth
• Flat
• Rigid
• Dimensionally stable
• Weather resistant
• Non-porous
• High surface energy (passes water break test)
Substrates with low surface energy may require additional preparation such as flame treatment,
mechanical abrasion or use of adhesion promoters prior to sheeting application.Guide sign
extrusions may be edge wrapped.Flat panels or unwrapped extrusions are to be carefully trimmed so that sheeting from adjacent panels does not touch on assembled signs.
YS Reflective Material Utility Grade Reflective Sheeting RS-P3800 Series is designed primarily for applications to flat substrates. Any use that requires a radius of curvature of less than five inches should also be supported by rivets or bolts. Plastic substrates are not recommended where cold shock performance is required.
Imaging
YS Reflective Material Utility Grade Reflective Sheeting YS-P3800 Series may be processed into
signs by any of the imaging methods described below. Customers should test each application to
meet their criterion before mass production.
1. Screen Processing
2. Ink Jet Printing
3. Applied Cut-Out Copy
Cutting
YS Reflective Material Utility Grade Reflective Sheeting YS-P3800 Series may be cut into letters
and shapes of at least 3 inches in height and stroke widths of at least 1/2 inch.Smaller sizes are
not recommended.The sheeting may be hand cut or die cut one sheet at a time, and ban sawed
or guillotined in stacks. Whenever two or more piece are used side by side, they must be
matched to assure uniform day color and night appearance.
YS Reflective Material Utility Grade Reflective Sheeting YS-P3800 Series is designed for use on
electronic cutting machines.In order to reduce the possibility of stress cracking,the inside corner
of cut out letters and symbols should be rounded using the largest radium consistent with
appearance.Minimum Radium should be 1/8 inch on a 3 inch letter.
Plotter Cutting
Programmable knife cut (electronic cutting)
1. Flat-bed plotters can either die cut or kiss cut and offer the most consistent reliable
performance.
2. Friction Fed plotter. Kiss cut only. Success has been achieved using plotters that have 600
grams of down force and a 60° cutting blade. Additional drive wheels may need to be added to
improve tracking. An alternative procedure is to cut sheeting from the liner side. Blade force and
knife depth must be set to score but not cut through the top film. Break apart individual copy or
apply pre mask to retain spacing.
3. Other Cutting Methods. YS Reflective Material Utility Grade Reflective Sheeting YS-P3800
Series may be hand cut or die cut one sheet at a time,and band sawed or guillotined in
stacks.Cutting equipment such as guillotines and metal shears,which have pressure plates on the
sheeting when cutting, may damage the optics.Padding the pressure plate and easing it down
onto the sheets being cut will significantly reduce damage. Maximum stack height for cutting
reflective sheeting is 1 ½ inch or 50 sheets.
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