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Retro-reflective
Sheeting on Signs
Highway signs are composed of many different
types of retro-reflecting sheets.
The types of retro-reflective sheeting are classified by the ASTM (the
organization that sets international standards). Theses types of
retro-reflective sheeting are listed below.
Type I – Engineer Grade is a standard reflective sheeting material
composed of little glass beads enclosed in a clear enzyme substance.
This grade contains no distinctive patterns or characteristics, other
than the fact that it reflects. Out of all sign materials, this one is
probably the strongest and most durable and can withstand the roughest
of conditions. It is known to have a service life of seven years.
Type II - This type of sheeting is known as the Super Engineer Grade. It
is comparable to the Type I sheeting, but is composed of larger glass
beads which adds to the level of reflectivity. Companies will insert
small trademarks into the sheeting so that it can be easily identified.
The price of this sheeting is nearly twice that of Type I, but its
service life is longer, approximately ten years.
Type III - This type is also known as high intensity reflective sheeting
and is often referred to as "encapsulated lens" sheeting. It is composed
of two layers, including an outer clear pigmented layer and an inner
layer which is reflective and contains glass beads. A lattice connects
the two layers which gives the sheeting a "honeycomb" look. Each
manufacture has its own distinctive lattice pattern. The cost of this
sheeting is about twice that of Type I and it normally has a ten-year
service life.
Type IV - This is a multi-layer sheeting composed of microscopic
cube-corner reflectors rather than glass beads, which is called a "microprismatic"
layer. The small square shapes are overlayed on a hexagonal lattice
network type pattern, which creates a distinguishing feature for this
type of sheeting. The cost of this type of sheeting is roughly the same
as the Type III sheeting. It usually has a ten-year service life.
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