TB 31 Polycarbonate Windows Flashcards
Lexan is a ____ that has outstanding impact strength, heat resistance, dimensional stability, transparency, ease of fabrication, resistance to ultraviolet light, and is self-extinguishing.
polycarbonate thermoplastic
Lexan is used in temperatures ranging from ____, and will soften at 350º F.
–60º F to 280º F
In normal use, Lexan window material has a thickness from _____.
1/8 inch to ¼ inch
On special installations protecting cashiers, bank tellers and toll collectors the thickness of sheets used may be up to____.
1¼ inch
Identifying Lexan :
Feeling the window surface with a bare hand reveals a ___ than glass.
softer surface
Identifying Lexan :
Striking the window gently with any hard instrument gives a ____ sound different from glass.
dull plastic
Identifying Lexan :
Lexan surface will ___ easily as opposed to glass.
scratch very
Identifying Lexan :
Large window installations of this material have a ___ and some obvious distortion along the sides.
wavy surface
In general, the Lexan has to be cut on ____ of the desired opening. It will not “crack out”.
all sides
Horizontal cuts should be made ____.
first
Cut as ___ as possible without bogging down the saw.
rapidly
During the cutting, wear goggles because chips and shards are produced that are ___ with considerable force.
thrown out
Chain saws are not effective and they ____ be used on this material.
shall not
Test have shown that sawing on Lexan will ___ of the chain saw blade, also intense vibration of the saw creates an extremely unsafe condition to the operator.
break the teeth
Striking or impact tools, such as hammer, axe, ram bar, etc., are not effective, except where the entire panel can be “____” the frame.
punched through
