The Beginning

Grain Processing Corporation (GPC) started a legacy of entrepreneurship, innovation, and unsurpassed quality when the company was founded February 11, 1943, by S.G. Stein and G.A. Kent, in Muscatine, Iowa. The company began as a government industrial alcohol plant, part of the World War II synthetic rubber program. When the war effort program ended, production shifted from industrial to beverage alcohol.

Expansion

In 1959, the company began a corn wet-milling operation, then expanded operations to produce high-quality, unmodified corn starch. The wet-milling operation was expanded once in 1962, twice in 1963, and several times since — allowing the introduction of acid-modified and oxidized starches for industrial use. During this time, GPC also produced its first sweeteners on an experimental basis.

In 1969, a line of hydrolyzed starch products, MALTRIN^® maltodextrin and corn syrup solids, was introduced. Then in 1990, the third plant expansion in 10 years was announced to meet growing demand.

In 1996, GPC announced plans for a new corn wet milling plant in Washington, Indiana. Since completion, the plant has strengthened GPC’s ability to produce consistent quality products and to provide on-time performance.

In 1997, a Technology Development Center was constructed in Muscatine to develop manufacturing processes for new products, improve existing manufacturing processes, evaluate and recommend new technology, and provide samples for evaluations and trials.

In 2022 GPC further diversified with the acquisition of Natural Products Inc. in Grinnell, Iowa. Expanding our plant-based offerings to include chickpea and specialty soy products.

Grain Processing Corporation (GPC) products

Starches

INSCOSITY - Modified Food Starch