Blackburn CR2-4-75032 EXOTHERMIC WELD CABLE TO ROD

It's an exothermic cable-to-ground-rod connection. The CR2-4-75032 makes a permanent molecular weld between a grounding conductor and an earth (ground) rod, rather than a mechanical clamp that can loosen or corrode at the interface. Blackburn catalogues it as a cable to earth rod connector of the exothermic type.

Use 115 BKB powder. The mold is sized for that charge, and the weld will not fill correctly with a smaller or larger cartridge, so order the powder alongside the mold. The mold itself is sold each.

No. The CR2-4-75032 is the mold only, sold as one each. You'll need the 115 BKB weld powder cartridges, an ignition source, and the usual mold handle and cleaning brush to complete a weld.

Graphite. Graphite molds are reusable for repeated welds on a job as long as the cavity is kept clean and dry and isn't chipped, which is why crews doing a run of ground rod connections buy the mold once and the powder by the shot.

For anything below grade or encased in concrete, the exothermic weld is the one to use. A bolted clamp stays serviceable and is easier for an inspector to check, but it's a mechanical joint that can corrode or back off, so it belongs where it remains accessible. The CR2-4-75032 makes a welded cable-to-rod joint intended to be buried and forgotten.

Exothermic cable-to-rod molds are cavity-specific: the mold matches one conductor size to one rod diameter, so the part number is the spec. Order by the exact Blackburn model, CR2-4-75032, and pair it with 115 BKB powder. A mold cut for a different conductor or rod won't seat the parts and the weld will leak.

Country of origin is the United States, which matters if you're bidding public work with domestic-material requirements on grounding components.