We started manufacturing Perlite Silicate Pipe & Block Insulations in 1977 as a subcontractor to a Wilmington, Delaware firm with manufacturing rights to a Patent held by E.I. DuPont Co. The quality control of these products was so poor that breakage in shipments and handling limited its acceptance. In 1979 we requested, and were granted, a license to manufacture Perlite Silicate Pipe & Block Insulations by the DuPont Company. Our first order of business was to improve and upgrade the quality of the existing product. We developed a new formula and started producing an acceptable product with better physical and thermal properties in 1980.

Along the years, we have added the first water repellent Perlite Silicate Insulation in the thermal insulation industry, R-1200 Perlite Pipe & Block, specialty items such as 90° & 45° elbows, T’s, flange covers, and valve covers.

In1995 we opened our Houston, TX warehouse. In conjunction with Extol of Texas (now SPI/Extol) we hit the ground running with over 1,000 perlite elbows in the Gulf Coast market. By 1997, we required a larger warehouse to handle the demand for our High Temperature Pre-Molded Perlite Fitting Covers.

1997 began with the construction of our new production facility in Devault, PA. This 25,000 sqft metal building would allow us to consolidate all product lines under one roof. Construction was completed in December of 1997 and all product lines were moved by the end of January 1998.

The new millennium brought a new product line for Sproule Mfg. Co., Inc., WeatherJacs™. These large-bore metal elbows are designed to fill the void where the current metal manufacturers leave off. We used our expertise in presses, molds, and large pipe sizes to launch this exciting new product line. Gary Sproule's new patented 'Weather Seal' also added a new feature to revolutionize the metal elbow market. We are rapidly building new molds to handle the demand for our new WeatherJacs™.