Assessing the Softening Points of Glass ASTM C338-93

Assessing the Softening Points of Glass ASTM C338-93

ASTM C338-93 is the method that measures the ‘flow points’ or temperature at which the viscosity of glass reaches 105 poises. It uses flow point apparatus to estimate the softening points accurately. The information is helpful in the development of glass and research on it.

    Scope:

    ASTM C338-93 is the method that measures the ‘flow points’ or temperature at which the viscosity of glass reaches 105 poises. A glass fiber of 0.65 mm diameter and 235 mm length begins to elongate under its weight at the rate of 0.1mm/min as the upper 100 mm of the size of the glass fiber is being heated in a particular furnace at the rate of 5 ± 1° C/minute. ASTM C338-93 helps identify the unique changes in glass composition and thus is essential in maintaining the desired composition. It also helps to evaluate the melting point of the glass.

    Test Procedure:

    ASTM C338-93 uses flow point apparatus to identify and evaluate the glass’s softening point (flow point). The device has the following components: glass sample, current contactor, small incandescent lamp, plastic flag that provide active load, platinum-rhodium heating coil, transformer, photocell, Variac, voltmeter, amplifier, and clock. The transformer powers the platinum-rhodium heating coil. Variac actuates 50 Volts to it, and the reading is taken from the voltmeter. A plastic flag (partially blackened) is attached to the given sample that provides the active load. It hangs between the photocell and the small incandescent lamp and thus blocks the light. The signals produced can be studied on the amplifier that receives signals from the photocell.

    Specimen Size : 

    A glass fiber of 0.65 mm diameter and 235 mm length was used.

    Data:

    The data is interpreted from graphs produced on the amplifier.

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