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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.

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