HMA - Heating Microscope Analysis for Frits Test

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.

Variables

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.

Related Information

Links

Tests	Frit Softening Point In ceramics, this is the temperature at which a glaze or glass begins to flow, ceasing to exhibit the properties of a solid.
Tests	Frit Melting Range (C)
Tests	I.F.P. (celsius)
Tests	Glass Transition Temperature In ceramic glasses (usually frits) the temperature at which the hard brittle state of the glass changes to the rubber-like state that precedes softening and melting
Tests	Frit Fusibility Test
Typecodes	Material Tests Test conducted primarily on materials use to make bodies or glazes.
Projects	Frits
Glossary	Glass-Ceramic Glazes

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