UV Resistance

Some plasticsare susceptible to attack from sunlight, in particular, the ultraviolet segmentof the spectrum. When ultraviolet attack occurs the material may have a colourshift, become chalky on its surface, and crack or craze. There are a number ofmethods to reduce this problem. The addition of carbon black to the polymerwill usually absorb most UV radiation. Chemical inhibitors are available forcertain plastics, which improve the UV resistance.  Paint and silicone coatings can also be usedto completely cover exposed surfaces to sunlight (UV radiation).  Additionally, there are several polymers onthe market that are inherently UV resistant as well.

ABS

ABS is notsuitable for outdoor applications because of its poor UV resistance. UVstabilized material can be manufactured, subject to minimum quantities of about1000 kg.

Acetal
Standard gradeacetal will degrade over time upon exposure to sunlight. The material cancrack, become brittle, and develop a chalky appearance.  Black sheet provides the best UV stability.\

Acrylic
Acrylic isinherently one of the most UV stable materials available.

Nylon

Unpigmentednylon will degrade upon exposure to sunlight evidenced by discoloration andbecome brittle. Formulations containing carbon black particles provide the bestUV stability.

PETG

Standard sheetis not UV stable. UV resistant sheet is available in some thicknesses.

Polycarbonate
Standard gradepolycarbonate will degrade upon exposure to sunlight. Polycarbonate will yellowand become hazy after about 1 year of exposure. UV resistant grades are available. Mar Resistant grades are also UVstable.

Polyethylene

Unpigmented(natural) polyethylene will degrade upon exposure to sunlight evidenced bydiscoloration and become brittle. Black sheet provides the best UV stability.

Polypropylene

Standard sheetis not UV stable.

PTFE

Standard sheetis not UV stable.

PVC
Standard sheetis not UV stable, however it is better under UV than a lot of plastics. UVstabilised sheet is available.

Polystyrene(High Impact Polystyrene (HIPS))

HIPS is notsuitable for outdoor applications because of its poor UV resistance. UVstabilized material can be manufactured, subject to minimum quantities of about1000 kg.