One of the characteristics for which C.A.B. has always been noted is its
high impact strength. The table below gives measurements of this impact strength
under conditions that would exist, for example, if a projectile were thrown at a
sign face. Some other materials are included in the table for comparison.

Sheet Material

Sheet Thickness
inches (mm)

Specimen Size
inches (mm) square

Impact Strength
ft-lb (joules)for F50 at

73°F (23°C)

0°F (-18°C)

-20°F(-29°C)

C.A.B.

0.125 (3.18)

4 (102)

26 (35)

23 (31)

20 (27)

Acrylic

0.125 (3.18)

4 (102)

<1 (<1.4)

<1(1.4)

<1 (1.4)

High-Impact Acrylic

0.125 (3.18)

4 (102)

14 (19)

1.3 (1.8)

Not Tested