Fiber Elongation to check Annealing and Strain Point of Glass ASTM C336

Fiber Elongation to check Annealing and Strain Point of Glass ASTM C336

ASTM C336 is used to measure the viscosity of the glass and provides valuable data about the strain points, annealing points, and setting thresholds for seals. It was proposed that the viscosities at the strain point and annealing point should be 1014.50 and 1013.00 poises respectively at 4°C temperature. Viscosity is expressed in poises.

    Scope:

    By calculating the viscous elongation rate of the fiber of the given glass, using ASTM C336, the annealing and strain points of the glass can be determined. ASTM C336-71 provides information on developing an appropriate annealing schedule, stress release estimation, and estimation of setting points for seals.

    Test Procedure:

    ASTM C336 takes place in a specialized furnace made up of the copper core, and glass fiber is attached. After the formation of glass at a high temperature, it is cooled carefully, typically at 4°C. The size and diameter of the given sample are measured. The following factors are evaluated while assessing the strain and annealing points; choice of glass, optical lever adjustment, temperature correction, fiber support, cooling rate, sample length, expansion, and viscosity.

    Specimen Size : 

    The specimen size can be up to 6 cm in length.

    Data:

    The viscosities are calculated by using the following formula

                                       η=4Lmg/3πd2e

    where η is the viscosity (poise), L denotes effective fibre length (cm), mg represents suspended force (dynes), d denotes fibre diameter (cm) and e is the elongation rate (cm/sec).

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