Six decades of metallurgical expertise.
We deliver high-performance carbon and graphite solutions
to the world's most demanding
foundries and steel mills .
Larpen Metallurgical Service specializes in the design and adaptation of graphite and carbon additives for the foundry and steelmaking industry. Founded in 1962, we deliver unparalleled expertise in service, quality, consistency, and flexibility, guaranteeing our clients the highest quality products tailored to their needs.
Explore our extensive line of GRAPH-HEX products and other high-quality graphite and carbon additives, designed to meet the diverse demands of the foundry and steel industry. Our advanced processes and commitment to quality allow us to offer the most economical and reliable products on the market.
01Over 50 high-purity carbon additives designed to each customer's specifications, with sulfur as low as 0.02%.
02Crystalline graphite for injection applications and FEA processes, with consistent purity and rapid dissolution.
03Low-sulfur petroleum coke (0.35–4.0% S) and Carbolon MA 90% silicon carbide for foundry chemistry.
01Over 50 high-purity carbon additives designed to each customer’s specifications, with sulfur as low as 0.02%.
02Crystalline graphite for injection molding and FEA processes, offering consistent purity and rapid dissolution.
03Petroleum coke with low sulfur content (0.35–4.0% S) and Carbolon MA 90% silicon carbide for foundry chemistry.
A family-owned company operating on a global scale — combining personalized service with the rigor of ISO-certified quality systems and continuous improvement.
Family heirloom since 1962.
Certified quality management.
Internal testing and validation.
Manufacturing in the USA and China.
On-time worldwide delivery.
Supported by global expertise.
1111 Western Dr, Hartford,
WI 53027
Henry Seeboth founded Larpen Supply Co., Inc., initially focused on Magna Flux and non-destructive testing equipment, later expanding into the distribution of supplies for foundries.
A new 4,645 m² plant is being built in Hartford, WI to meet North American demand.
Larpen has obtained ISO 9001:2000 registration under the new QS 9000 standard.
Integrated into the Unimetal Group, combining family heritage with global technical expertise.
Speak to our technical team about a custom carbon formulation designed specifically for your foundry or steel mill.