Unimin Corp.
258 Elm St.
New Canaan, CT 06840

800-243-9004 (U.S. and Canada)
203-442-2500 (World)
Fax:  800-243-9005 (U.S. and Canada)
203-972-1378 (World)


Mike Pigage, General Sales Manager, Metals & Casting Group

Mark Ziegler, Director, Foundry Technical Sales

Chris Karr, General Manager, Marketing, Industrial Applications


Unimin Corporation is North America’s largest producer of silica sand, nepheline syenite and high purity quartz, and major supplier of feldspar, ball clay, kaolin, calcium carbonate, quicklime and hydrate. The Company operates 45 mining and mineral processing facilities in the United States, Canada and Mexico, with technology and analytical service centers located throughout North America.  Committed to both basic and applied research, these facilities support research and technical service initiatives that deliver value to our customers.

Unimin offers North America’s most extensive portfolio of high purity core and molding sands. INCAST® silica grades range from GFN 25 for lost foam backing to GFN 125 for non-ferrous molding. These engineered size distributions are characterized by their low total surface area, providing the ideal conditions to maximize tensile strength while reducing resin, catalyst and additive consumption.

A fundamental strength of the Company is its application-focused customer teams. The training is industry oriented; with emphasis on the function and performance of our foundry sands in resin bonded core and molding processes, green sand and lost foam backing. With hands-on experience these teams facilitate the technical exchange that can help our customers improve productivity and yield, minimize emissions and waste, and create a sustainable competitive advantage.

Unimin has been twice recognized for its exemplary safety and health record with the prestigious Sentinels of Safety award by the Mine Safety and Health Administration (MSHA) and the National Mining Association (NMA). The Company is also recognized by the Wildlife Habitat Council for outstanding environmental stewardship and employee volunteerism with the prestigious Corporate Habitat of the Year award, and Community Partner of the Year and Signatures of Sustainability awards.

Unimin Corporation is certified a sustainable company by the Global Reporting Initiative (GRI), the world’s most widely used sustainability reporting framework. The GRI establishes standardized guidelines and certifies responsible business and operating practices in the four major areas of sustainability; Economic, Environmental, Social and Governance. The complete report “Value Beyond Mining” can be found at www.uniminsustainability.com.

Ask the Experts

Q Please explain the Free Radical Cure (FRC) process of core making?

A The FRC is a process that has some unique attributes. A significant one is that epoxy acrylic binders (at ASK Chemicals we call it “ISOSET”) achieve an unlimited life for the sand mixture. As with many other cold box processes, the reaction between the part A and part B binder begins when the two are mixed....Read Full Answer

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