We produce this kind of anodes according to ASTM A*****6 (grade 3) standard. They are made by Chill Cast technology, and have higher performance and better quality.
 

Silicon iron anodes are probably the most commonly used anodes in cathodic protection ground bed construction and the high corrosion resistance of silicon iron and silicon chromium iron alloys means that cathodic protection system lifetime in excess of *0 years may be achieved.

The anodes can be used in many different environments eg onshore, seawater and freshwater applications. Silicon iron anodes are for use in neutral soils and freshwater environments. Silicon chromium iron anodes are for use in aggressive acidic or alkaline soils and seawater environments.