Polished acrylic components comprise most of the optically clear parts in use today. In its uncolored grade, acrylic has clarity equivalent to glass but is lighter in weight, more rigid, and more resistant to scratches and breakage. It is one of the least expensive materials for optically clear parts, and it features a tint-free finish. Acrylic is also a versatile alternative to both glass and heavier plastics, easily withstanding dramatic temperature changes.
Acrylic is the closest plastic substitute for window glass. General purpose-grade cast and polished acrylic parts will block UV wavelengths up to 360 NM (for applications requiring transmittance of 280 NM and above, consider UVT grade). Total internal reflection is possible in acrylic parts, making them useful in light pipe applications.
Acrylic has good weathering ability, high impact resistance, and good chemical resistance and dimensional stability. A skilled machinist can make drilled holes in acrylic straight and clear. Buffing, flame polishing, and optical machining are all effective polishing processes for acrylic. Acrylic polishing allows for many novel edge lighting approaches, and highly polished acrylic lenses are often produced by optical machining.
Acrylic performs well in pneumatic and vacuum applications. Operating pressures as high as 150 psi (depending on channel layout) can be supported.