Training Bulletin #31 Polycarbonate Windows (Lexan)

Question 1

Lexan is used where?

Answer 1

Where windows are subject to attack by vandals, rioters, or burglars (banks).

Question 2

What are the characteristics of lexan?

Answer 2

• impact strength
• heat resistance
• dimensional stability
• transparency
• ease of fabrication
• resistance to ultraviolet light
• self- extinguishing

Question 3

What is lexan made of?

Answer 3

polycarbonate thermoplastic

Question 4

What range of temperatures is lexan used in?

Answer 4

-60 degrees to 280 degrees F

Question 5

At what temperature will Lexan start to soften?

Answer 5

350 degrees F

Question 6

What is the thickness of lexan windows for NORMAL use and SPECIAL uses?

Answer 6

• Normal: 1/8” to 1/4”

- Special (banks): 1 1/4”

Question 7

What ways can Lexan be identified compared to glass?

Answer 7

• Softer surface
• When hit with hard instrument makes dull plastic sound
• Surface scratches very easy
• Wavy surface and obvious distortions on large windows

Question 8

How can Lexan windows be cut?

Answer 8

Rotary saw using a CARBIDE tipped wood cutting blade

**Lexan has to be cut on all sides, it will NOT “crack out”.

Question 9

What cuts should be made first, vertical or horizontal?

Answer 9

Horizontal

Question 10

Are striking tools effective on lexan?

Answer 10

Only when the entire panel can be “punched through” the frame.

Question 11

How is the lexan installed?

Answer 11

Bolted or pop-riveted to the frame to prevent “punch through.”

Question 12

In a multi-pane window the _ may be cut allowing the panes to be pushed in.

Answer 12

mullions (vertical bars between panes of glass in a window)