Monofrax offers complete laboratory and materials testing. We are committed to providing technical support to our customers for the characterization of refractory performance or glass defects. Our over 60 years of combined personnel experience involves a wide variety of refractories including bonded materials and fine grained technical ceramics in addition to fusion cast refractories. Laboratory facilities contain state-of-the-art analytical instrumentation with NIST supported reference standards for accurate analyses. For other testing needs, Monofrax has access to labs at several universities including the University of Florida and University of Oklahoma.

Some of the services we provide include the following:

  • Refractory Corrosion Evaluation
  • Testing of Physical Properties
  • Chemistry and Phase Analyses


The area inside a glass furnace with potential for defect generation from refractories is large (~ 3600 ft2 for container furnaces ~ 14000 ft2 for float furnaces). Batching errors, temperature generated devitrites, and mechanical finishing steps can also contribute to defect generation. While there will never be zero defects, a glass quality problem can impact production costs significantly and will continue to negatively impact costs until the problem is resolved.

Monofrax makes problematic customer defects a top priority and will do the following when a background information questionnaire is completed and returned.

  • An initial evaluation with an ongoing analyses preliminary report.
  • A final report with detailed chemical and microstructural analyses. This report goes beyond analyzing the defects themselves and gives a hypothesis on possible origins with recommended solutions.

As another customer service, Monofrax can also conduct a Glass Defect Seminar on site or at our plant.

Zirconia stone in amber glass bottle

Wollastonite Stone in Fiberglass

Viscous knot with ZrO2 in sodalime glass