No-Bake Sand Failures in a Foundry
A foundry had a problem when a gray, putty-like substance was found to periodically clog the feed system of a toluene-sulfonic acid, no-bake sand system.
A GC/MS (gas chromatography/mass spectrometer) analysis of the foreign material identified it as a polymer of toluene-sulfonic acid.
An examination of the MSDS sheet found the material to be incompatible with ferrous-based materials.
That allowed investigators to trace the problem to stainless steel fittings on the delivery system that catalyzed the polymerization of the toluene sulfonic acid.
- Failure Analysis Index
- Corrosion Evaluation
- Light Microscopy
- Mechanical Testing
- Research & Development
- Scanning Electron Microscopy
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Failure Analysis Examples
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