* 
Table 3. Catastrophic Failure of EDU Acrylic Plastic 
Windows Under Short-Term Hydrostatic Loading 
Window Diameter | Flange Opening Thickness Temperature | Failure Pressure 
De t psi 
inches 3.000 inches 1.042 inches 32°F 
inches 5.000 inches 1.645 inches 32°R 
inches 3.000 inches 1.035 inches 54°F 
inches 5.000 inches | 1.640 inches 54°F 
inches 3.000 inches | 1.053 inches 76°F 
inches 5.000 inches 1.635 inches 76°F 
inches 3.000 inches | 1.030 inches 98°F 
inches 5.000 inches | 1.650 inches 98°F 
inches 3.000 inches | 1.043 inches 120°F 
inches 5.000 inches | 1.630 inches 120°F 
* 
Swedlow 350 acrylic plastic 
NOTE: 1. All windows were pressurized at 650 psi/minute rate till 
catastrophic failure took place. 
2. All windows were tested with 0.025-inch thick neoprene impreg-— 
nated nylon cloth serving as the bearing gasket on the flange 
seat. 
3. No retaining ring was used to restrain the window in the flange. 
