In 1932, the brothers began inching their way into the national market. During the depression years their business flourished while others began failing. There was nothing else like it in the national marketplace. The bar's uniqueness and superb quality served to push the product up the ladder of success.

As the candy bar grew in popularity, the production facilities on South Jackson Street grew to keep up. This was still a hand-operation from beginning to end. It was ten years later that the plant was partially mechanized for the first time.

It was a sales achievement obtained during World War I that was credited for growth to an international market. Heath English Toffee "America's Finest," would now become popular world wide.

In 1946. L.S. his four sons two daughters and grandchildren formally incorporated L.S. Heath and Sons Inc. The company grew, and changed, acquiring other confectionery firms.

In 1967 a new production plant was built on West Main street where it remains today. The operations and equipment were extensively modernized in the late 1970s. The plant was now fully automated and a chocolate processing plant was added. The popularity of the candy continued to grow.

In 1989 the Heath family sold the company to Leaf, Inc., a division of Hutamaki Oy of Helsinki, Finland. American operations were headquartered in Lake Forest, Illinois.

In 1990, Leaf, Inc. strengthened its commitment to Robinson, IL through a major expansion of the facility. The Main Street production facility was expanded by 234,000 square feet and approximately 300 new employees were hired.

In addition to being the home of the Heath Toffee Bar, Robinson is now manufacturing Milk Duds, Whoppers, Payday and Zero candy bars.