Expansion and Contraction of acrylic & Coefficient of Thermal Expansion
Acrylic sheet expands and contracts approximately 3 times more than metals and 8 times more than glass. A calculation for expansion and contraction is as follows:
Total Movement (in) = Sheet Length x Temperature Difference x Coefficient of Thermal Expansion
|Product||Coefficient of Thermal Expansion (in/in-°F)|
|ACRYLITE® LED sign grade acrylic sheet||0.000044|
|ACRYLITE® Resist 65 acrylic sheet||0.000044|
|ACRYLITE® Resist 45 acrylic sheet||0.000040|
|ACRYLITE® Premium (FF) acrylic sheet||0.000040|
|ACRYLITE® Optical mar-resistant acrylic sheet||0.000040|
|ACRYLITE® cast acrylic sheet||0.000040|
|CYROLON® polycarbonate sheet||0.000038|
For Dark Sheets — Multiply the Total Movement by a 1.4 safety factor due to solar energy absorption.
Installation should occur in the mid-temperature range because at this point the expansion and contraction is at the minimum.