ASTM C-1351

VISCOSITY OF GLASS NEAR THE SOFTENING POINT BY VISCOUS COMPRESSION OF A RIGHT CYLINDER

The viscosity of glass from 5 to 9 Poise (log 10) is determined by measuring the rate of the viscous bending of a loaded glass beam.  Representative specimens, nominally 3 to 4 mm in cross section and 75 mm in length are required.

$360 per glass to 1000C

$290 per glass for beam preparation

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