Corrugated pipe is fabricated from steel that has been hot-dipped in commercially pure aluminum. Over 50 years of field-testing confirm that Aluminized Type 2 (ALT2) corrugated steel pipe offers 75 years or more of maintenance free service life in the environmental ranges of pH 5-9 with resistivities as low as 1,500 ohm-cm.

Contech corrugated steel pipe (CSP) with heavy-gage polymer coating offers long-term protection for storm drains and culverts. Even under harsh conditions, polymer coated CSP protects against abrasion and corrosion to provide at least 100 years of service life. This tough film, bonded to both the inside and outside of Contech’s galvanized CSP, serves as a protective barrier - resisting corrosion from acids, salts and alkalis found in today’s storm sewers and culverts.

Pre-galvanizing is the most widely used and most economical metallic coating for corrugated steel pipe and it protects and extends service life. In addition to forming a physical barrier against corrosion, the zinc coating sacrifices itself slowly by galvanic action to protect the base steel. This action continues as long as any zinc remains. The design life of galvanized pipe - installed in a corrosive environment - can be extended by coating the pipe with asphalt

CORLIX^® corrugated aluminum pipe (CAP) provides a predictable service life of more than 75 years when installed in the recommended soil/water environment and is ideal for municipal storm sewers, underground stormwater detention systems or any standard drainage project that must withstand corrosive environments. CORLIX^® weighs only 1/35 as much as reinforced concrete. Lighter weight means easier installation. Trench width and depths are reduced due to the smaller outside diameters, resulting in time and cost savings for both excavation and backfill. ULTRA FLO^®  is also available in aluminum alloy material. Aluminum ULTRA FLO has only 1/35 the weight of concrete pipe. Lower labor costs also result from fast and easy joining.