A Proposed Standard Thermal Endurance Test Based on the Use of Glass Rods. A Report of the Glass Standards Committee of the Society of Glass Technology.

JSGT 1936 V20 T498-T510

Numerous experiments conducted in several laboratories have been carried out on glasses of various compositions, to ascertain how far small lengths of glass rod 5 cm long and 2–6 mm in diameter can be used to give a satisfactory test of thermal endurance, by heating in an electric furnace and quenching in water. The results have been subjected both to general and to statistical study, and encourage the hope that a general test can be formulated.