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Glass Manufacturing

Produced from high quality natural ores at 8 facilities in North America, Carmeuse’s milled limestone products are used in a variety of industrial applications offering affordable and versatile solutions including the production glass.

Carmeuse is dedicated to supporting the North American glass industry with high quality limestone products, backed by world-class technical support.

Screen-grade limestone provides both calcium and magnesium to increase durability and control viscosity during the formation of glass.  Consistent quality and low trace elements (i.e. iron, chromium) are essential.

Screen-grade limestone is used in the production of:

  • Soda-lime glass
  • Fiberglass

Soda-lime glass

This glass is typically made using a wet batch process where the composition is primarily limestone, soda ash and silica.  End-use products include container and flat glass.  Approximately 90% of the world’s glass production is soda-lime glass.

Typical Soda-lime Glass Composition:

Silica sand 73%
Soda ash 13%
Limestone 8%
Dolomite 4%
Alumina 1%
Other 1%






Screen-grade limestone is used in glass production as a flux for modifying viscosity, increasing the final product durability and chemical wear resistance.  Without limestone, soda-lime glass would dissolve in water.


Left: Flat glass manufacturing process
Right: Container glass manufacturing process


Fiberglass is a material fabricated from extremely fine fibers of glass and is found in applications ranging from household insulation to ladders to auto body panels.


Benefits of Milled Limestone in Glass:

  • Controls viscosity
  • Increased durability
  • Chemical wear resistance

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