This has been the standard for corrugated metal pipe for over 100 years
and has been used by Wyatt since 1913. The steel is coated on both sides
with 2 oz. per
sq. ft of surface area. This coating produces a protective layer of .0017
inch on each surface.
ALUMINIZED TYPE 2
A pure aluminum coating is applied to the bare steel instead of
a galvanized coating, this produces a coating thickness of
.0019 inch on each surface.
A bituminous, or asphalt coating is applied to the corrugation on steel pipe
to a thickness of 1/8 inch above the crest of the corrugations.
A polymer film coating is laminated over the galvanized
coating on steel pipe to a thickness of .0010 inch on the entire