C o n s u l t i n g :     G F R C    |    G R G     |    F o r t o n   M G


The first GRG architectural moldings were produced in England by David Gillespie & Son using alpha gypsum and a water-based polymer obtained from Synres Chemical, who was owned by DSM and was also developing the polymer for GFRC, in the Netherlands. In addition, while still at PPG, Hiram had a relationship with USG, in Chicago, IL as they developed the gypsum formula specific to GRG and the addition of glass fibers. This process was quickly picked up by several
companies in North America, most notably, Formglas in Toronto, Canada, as well as many other companies.

He chaired the Task Group of ASTM C 11 that wrote the three specifications for GRG that are still in use.

  • C 1355 Standard Specification for Glass Fiber Reinforced Gypsum Composites
  • C 1381 Standard Specification for Molded Glass Fiber Reinforced Gypsum Parts
  • C 7467 Standard Specification for the Installation of Molded Glass Fiber Reinforced Gypsum Parts

Hiram also helped write the CISCA Recommended Practice for GRG.

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