As a monofilament, PMMA’s primary application isas the core material of Plastic Optical Fiber (POF). A majority of the cross-section (96%) of these fibers is made up of PMMA, which allows for the transmission of light, while fluorinated polymers are used for the cladding to maximize the reflection of light inside the PMMA core. Plastic Optical fibers containing PMMA monofilament are being used increasingly in digital home appliances, car and home networks, and illumination devices today.
PMMA has excellent abrasion and UV resistance, and excellent optical clarity, but low temperature, fatigue, and solvent resistance. Nevertheless, its environmental stability is superior to most other plastics such as polystyrene or polyethylene; therefore PMMA is often the material of choice for outdoor applications as well.