14070 Proton Road Suite 100 LB 9 Dallas, TX 75244

Aluminum Coated Type 2

NCSPA » CSP Coatings » Aluminum Coated Type 2
OverviewALT2 ApplicationsDOT InformationSuccess StoriesResources

Aluminum Coated Type 2

 

corrugated steel pipe detention system large volume detention systemAluminum Coated Type 2 (AASHTO M274, ASTM A929) is a pure aluminum coating (no more than 0.35 percent silicon). It is produced with a coating weight of 305 g/m² (1 oz/ft²) of surface (total both sides) to provide a coating thickness of 48 µm (0.0019 in.) on each surface. The aluminum coated type 2 (ALT2) is the most widely used supplemental coating for CSP. “Aluminum is a reactive metal, but it develops a passive aluminum oxide coating or film that protects it from corrosion in many environments.” This film is quite stable in neutral and many acid solutions but is attacked by alkalies greater than a pH of 9. From a corrosion standpoint, aluminum has an advantage over galvanized in lower pH and in soft water conditions due to the formation of the oxide film. The coatings are essentially equal under abrasion and in waters where the zinc oxide film forms rapidly.

Aluminum coated type 2 CSP has been installed at thousands of sites over the past 50 years and many of these sites have been and are still being monitored for performance. Recent AK Steel research has indicated that 14 gage ALT2 CSP can achieve a 100-year service life when the environmental conditions have a pH of 5 to 9 and a resistivity greater than 1500 ohm-cm.

For more information download our Pipe Selection Guide found here.

DOT Information

The below is a map of the states that currently accept ALT2 coated pipe and plate in their specs.

Success Stories

structural steel plate bridge

Award-Winning structural Steel plate Bridge Built to Handle Military Might

By: Atlantic Industries Limited Military-Grade Loads Meet Steel Strength When Defence Construction Canada (DCC) set out to replace a key crossing at Canadian Forces Base ... Read more
Stream crossing solutions Ten Tenths Motor Club

Racing Toward Innovation: How Stream Crossing Solutions Fueled the Award-Winning Ten Tenths Motor Club

By: Contech Engineered Solutions A Victory Earned Before the First Lap Before the rumble of engines even fills the air, Ten Tenths Motor Club is ... Read more
corrugated steel aircraft fire training structure NCSPA Resiliency Project of the Year

Resilience Recognized: Steel Pipe Innovation Earns Top Honors in Aircraft Fire Training

By: Pacific Corrugated Pipe Company Resilience Recognized: Corrugated Steel Innovation Earns NCSPA Project of the Year in Advanced Aircraft Fire Training Just when you thought ... Read more

Studies, Resources & Marketing Materials

Portland Web Design - Watermelon Web Works LLC