USG Closes Southard Gypsum Plant Raising Costs for Specialty Plasters
USG will idle its Southard plant, tightening the supply of high-purity specialty gypsum and raising plaster sourcing costs.
Industrial Plasters
Gypsum Derivative
Dehydrated gypsum products engineered for specific setting times and mechanical strengths are the foundation for molding and construction casting. Specialized industrial plasters differ from standard building materials through their narrow particle size distribution and chemical purity. These binders are classified by their water-to-plaster ratio and their final expansion characteristics.
Formulation Capability
Chemical additives modify the natural behavior of the gypsum to meet the needs of a specific production line. Retarders lengthen the working time for large architectural casts while accelerators speed up the demolding cycle in ceramics. Defoamers prevent surface pinholes by releasing trapped air during the mixing phase.
When industrial plasters are used in glass grinding, they must provide enough grip to hold the sheet without scratching the surface. Strength enhancers increase the resistance to chipping in finished molds. The density of the slurry is measured with a slump test to ensure consistency between batches.
Precise control over the hemihydrate phase ensures that the material performs predictably in automated systems.
Industrial Application
Sanitaryware and fine china production rely on the porosity of the mold to pull water from the clay slip. The lifespan of the mold depends on the abrasive resistance of the plaster surface.