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Heating Microscope Analysis for Frits - HMA

This test procedure was employed in the Foresight Ceramic Database and now is available for those having an account at Insight-Live.com. Accumulating test data using the variables defined in these procedures enables us to create tools that enable you to compare the physical properties of materials and recipes.


Information found at http://www.reimbold-und-strick.de/
This test is important in the assessment of materials for use in glass ceramics. The heating microscope describes the melting of frits during the heating process. A cube of 3x3x3 mm is pressed of fine ground frit, is heated at 30 - 40°C/min (others specify 10°C/min) to 1400C. During this process characteristics of the silhouette are recorded. These observations can be interpreted differently by different people.

For frits, it is more common to interpret a glass transition (transformation) point and softening point by interpreting the curve produced by a dilatometer.


SP - Sintering Point (V)

At this temperature the height of the cylinder shrinks by 5%, also referred to as transformation point.

EP - Softening Point (V)

The beginning of softening: The temperature at which the corners show rounding.

K - Ball Point (V)

At this temperature the silhouette is similar to a sphere.

HK - Half-ball Point (V)

Temperature at which the height is half of the base. Interpreted at the melting temperature.

F - Liquid Point (V)

The sample has melted to 1/3 of its original height.

Out Bound Links

  • (Tests) GSPT - Frit Softening Point
  • (Tests) MLRG - Frit Melting Range (C)
  • (Tests) IFP - I.F.P. (celsius)
  • (Tests) GTTM - Glass Transition Temperature
  • (Typecodes) 5: MTT - Material Tests
  • (Glossary) Glass-Ceramic Glazes

    Glass-ceramic frits are made by the controlled devitrification (crystallization) of a composition to create a homogeneous structure in a glassy matrix. Glaze employing these crystalline frits have improved hardness. Glass ceramic coatings are common on tiles because of their superior abrasion resist...

In Bound Links

  • (Project) Frits

    The number of different frits in the world can be intimidating, there are thousands. However, unlike stains, their are a wide range of standard formulations that have been made for many years. We are ...

  • (Tests) FRFU - Frit Fusibility Test

By Tony Hansen

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