Stephen Hayde invented and patented the method of making a structural grade lightweight aggregate early in the twentieth century. The process uses a rotary kiln to pyro-process and expand clay, shale or slate. The end product is a strong and durable lightweight aggregate used in numerous types of construction throughout the world.

Hayde named the product after himself. Although the original patents have long since expired, the term "Haydite" is used by several companies in marketing their expanded shale lightweight aggregate.

We invite you to visit these companies' web sites - just click on the logos below.   

The Southwestern Bell telephone building project in Kansas City Missouri is one of the early landmark uses of Haydite