3MM (.118”) acrylic sheet is approximately 2 to 3 times more impact resistant than double strength window glass, and 4 to 5 times more impact resistant than wire glass or other glasses. It is lightweight – half the weight of glass and is recommended for both indoor and outdoor use. It is able to withstand prolonged exposure to the sun and elements. Clear acrylic sheet has UV transmittance of 10-20% (in the 250-400 nm wavelength range), and visible light transmittance of 92%.
Fun Fact: Acrylic, best known by the trade names Plexiglas®, Acrylite® and Optix® was developed in the 1930's and was one of the first plastics to become available for everyday use. Its first practical application was windows and canopies on military aircraft during WW II. After the war, sheets left over from airplane production were introduced for impact-resistant glazing in businesses and homes.
.177 thickness is also expressed as four-point-five millimeters (4.5MM) and is close to the fractional 3/16"
.118 thickness is also expressed as three millimeters (3MM) and is close to the fractional 1/8"
.236 thickness is also expressed as six millimeters (6MM) and is close to the fractional 1/4"
.374 thickness is also expressed as nine-point-five millimeters (9.5MM) and is close to the fractional 3/8"
.472" thickness is also expressed as twelve millimeters (12MM) and is close to the fractional 1/2"