H-1 Standard Potential Mag Anode

Typical Applications

H-1 anodes are recommended for use in low resistivity soils (typically below 2,000 ohm-cm). Because the anodes have a lower driving voltage than high potential anodes, they are ideally suited for structures where over-protection is of concern. Their lower current output allows these anodes to operate longer than high potential anodes in more conductive environments.

MESA Manufacturing Process

Each bare cast anode is closely examined for shrinkage voids, core centering and length, and weight conformity. Any inconsistency results in rejection. A coiled lead wire of #12 TW insulated solid copper is silver soldered (45% silver) to the galvanized steel core. Standard wire length is 10 feet long. The 45% silver in the solder is critical to ensuring a 'stronger than the wire itself' connection. The core cavity is filled with electrical sealing compound to assure a fully insulated and protected connection. Bare anodes are centered in cotton bags, then surrounded with a backfill mixture consisting of 75% hydrated gypsum, 20% bentonite, and 5% sodium sulfate. This backfill lowers the anode-to-earth resistance, draws moisture to the anode for best performance, and creates a uniform environment for the anode to consume itself evenly. The packaged anodes are then inserted into multiwall paper sacks, palletized, and film wrapped for shipping.

Chemical Composition

Element	Content %
	Grade A	Grade B	Grade C
Aluminum	5.3-6.7%	5.3-6.7%	5.3-6.7%
Zinc	2.5-3.5%	2.5-3.5%	2.5-3.5%
Manganese	0.15-0.7%	0.15-0.7%	0.15-0.7%
Silicon	0.10% Max	0.30% Max	0.30% Max
Copper	0.02% Max	0.05% Max	0.10% Max
Nickel	0.002 % Max	0.003% Max	0.003% Max
Iron	0.003% Max	0.003% Max	0.003% Max
Other Impurities	0.30% Max	0.30% Max	0.30% Max
Magnesium	Remainder	Remainder	Remainder