The Bursting Pressure Test on Glass Bottles

JSGT 1937 V21 T187-T195

Rapid, or so-called snap bursting pressure tests a.re affected by the rate of pressure increase as well as by the method of support of the bottle, results tending to favour the smaller bottle. Sustained pressures of any desired amount up to about 700 lbs. per square inch can be easily and accurately applied by means of an apparatus designed by F. W. Preston. This instrument can be used either for dead-line testing, or as a check on a more rapid snap test machine. Results from the sustained pressure tests decrease with increasing time of application of the pressure, the effect of fatigue being clearly shown. By means of the Preston machine the higher values for bursting pressure obtained in snap tests from bottles annealed in open lehrs as compared with those annealed in muffle lehrs are confirmed in cases where the pressure is applied for definite periods of time.

Arnold Cousen