Larpen Metallurgical Service

North American Leader and World-Wide Supplier of Graphite and Carbon Additives Since 1962



Products Offered


The Most Economical High Quality Carbon Additive in the Market

GRAPH-HEX® product was developed through our expertise in the early 2000’s as an economical source of high quality recarburizers for the foundry and steel industries.  Utilizing our world wide sourcing of the highest quality raw materials combined with state-of-the-art manufacturing facilities, and quality control enables our customers to receive the most economical high quality carbon additive in the market.

GRAPH-HEX® covers a complete range of recarburizers used throughout the Iron and Steel industry. With the capability to specifically design products to individual customer needs our product line consists of over fifty products. GRAPH-HEX® sulfur contents range to as little as 0.02% and up to 0.2%


GRAPH-HEX® products offer the following advantages:

  • High Carbon Recovery
  • Rapid Dissolution
  • Consistency
  • Low Ashgroup-2
  • Low Sulfur
  • Low Nitrogen
  • Low Hydrogen
  • Reliability
  • Economical Savings
  • Reduced Carbon Consumption, Tap-to-Tap Time, and Scrap Rate

Low Sulfur Pet Coke

Larpen Metallurgical Service produces low to medium sulfur petroleum cokes ranging in sulfur from 0.5% – 4.0%. These products are used as a charge carbon for gray iron casting.

Silicon Carbide

Larpen Metallurgical Service is a distributor of Carbolon MA 90% silicon carbide from Washington Mills.