... %-99.98% Mg 99.90%min , Si 0.025%max , Al 0.02%max , Fe 0.04%max Cu 0.004 ... the printing industry.- In the form of turnings or ribbons, to prepare Grignard reagents, which are useful in organic synthesis.- As an ... other metals from their salts.- As a sacrificial (galvanic) anode to protect underground tanks, pipelines, buries structures, and water heaters. Magnesium ...