10 times tougher than glass and much safer. Optix acrylic panels flex to absorb impact. Independent lab tests have shown that while Optix acrylic sheet may break, it does so in a safe manner, which will significantly reduce the likelihood of serious injury. Can be used for storm doors, windows, picture frames, interior storm windows, garage door windows, displays and signs. Optically clear. Raw materials, manufacturing process and finished products are continually inspected to ensure the highest quality standards of optical clarity and strength. Approximately 3 mm or 0.118" (+/-5%). Provides greater safety than annealed glass in glazing applications because of greater breakage resistance. Comply to American National Standard Z97.1 . 1994 safety glazing requirements as well as the Consumer Products Safety Commissions (CPSC) 19 CFR part 1201 safety glazing standard. Withstands exposure to blazing sun, extreme cold, sudden temperature changes, salt water spray, etc. Lightweight for easy handling. Accepted for use by the major building codes: ICBO and BOCA. Classified as a CC2 building material