Table B-l. Catastrophic Failure Under Short-Term Hydrostatic 
Loading of Flat Disc Acrylic Windows Resting on 
Different Gaskets. 
Diameter} Thickness Acrylic Plastic In Bearing Gasket Implosion 
(psi) (psi) Windows Material Pressure (psi) 
eee Seer Er a 6 See 
4.443 shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
QQ QO 
0.025 inches 
thick nylon 
fabric impregnated 
with Neoprene 
unshrunk Plexiglas 
unshrunk Plexiglas 
unshrunk Plexiglas 
unshrunk Plexiglas 
Maa a 
0.025 inches thick 
nylon fabric im- 
pregnated with 
Neoprene 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
QAAaAa Ga 
shrunk Plexiglas 
Swedlow 350 
Swedlow 350 
shrunk Plexiglas G 
0.125 thick 
Neoprene of 90 
durometer hardness 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
QQqa Qa 
0.125 thick 
cork gasket 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
QQ a 
0.250 thick 
Neoprene of 
90 durometer 
hardness 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
shrunk Plexiglas 
QANaNnaA 
NOTE: 1. All windows were tested at 650 psi/minute rate in 119-120°F 
ambient temperature environment. 
2. The opening in the flange for small windows is 3.000 inches, 
while for large windows it is 5.000 inches. 
3. All bolts on the retaining ring were torqued down to 20-foot lbs. 
4. The compression gasket under the retaining ring was in every case 
0.125 thick cork gasket. 
32 
