Why not to use Glass for Underwater Windows

003-1 Foto vidrio piscina a reponer (6) The picture shows the two best reasons why not to use float glass for underwater windows:
  1. The window is supposed to be transparent. Instead it is green like a water bottle. Note that float glazing needs to be very thick to withstand the water pressure. The transparency of float glas is lower than that of acrylic glazing, giving the window a greenish color
  2. See the cracks on the bottom of the window? Float glas is not meant to be used under pressure. It is not flexible. It shatters. People might tell you that this is true for normal float glass, but not for their “special” float glass. From my long experience with pressurized glazing, this is not true.

This is why Hydrosight does not use float glass. Hydrosight uses cast Acrylic glazing.

Related Information: Technical Comparision of Glass and Acrylic


Categories: Technology of Glazing under Pressure, Underwater Window
Created: 12 March 2014
Last Modified: 18 March 2015

Related Posts

Waterproofing Swimming Pools
The walls and the ground of a swimming pool are subject to constant water pressure. For...
Fire Rating of Acrylic
Both cast and extruded Acrylic burn more or less like hardwood; very little smoke generatio...
Shapes of Aquarium Tunnels
Cylindrical Aquarium Tunnel Tunnels are typically cylindrical in design. The most common t...
Glass vs. Acrylic: a Comparision
Glass needs to be very thick and has usually one or more laminated layers to be able to bear wa...
A comparision of waterproofing slurries
Waterproofing slurries are applied directly onto the concrete This is where we used Ardex S7...
Plexiglas Acrylic made by Röhm
Roehm (also spelled Röhm) invented acrylic glass / Plexiglas® 1933 and was a major play...

Hydrosight Underwater Windows