Digitalfire Test Procedure Database

Heating Microscope Analysis for Frits - HMA

Notes

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 are referenced differently by some.

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.

Out Bound Links

• (Tests) MLPT - Melting Point (MP)
• (Tests) MLRG - Melting Range (C)
• (Tests) IFP - I.F.P. (celsius)
• (Tests) FTP - Frit Transformation Point
• (Typecodes) 5: MTT - Material Tests
• (Glossary) Glass-Ceramic Glazes

  Glass-ceramic glazes are made by the controlled de...

In Bound Links

• (Tests) GTTM - Glass Transition Temp (Tg)
• (Project) Frits

  The number of different frits in the world can be ...

• (Tests) FRFU - Frit Fusibility Test