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2. Photo-oxidation of polymers - Wikipedia

   en.wikipedia.org/wiki/Photo-oxidation_of_polymers

   Depending upon substitution, the UV absorption spectrum is changed to match the application. Concentrations normally range from 0.05% to 2%, with some applications up to 5%. Frequently, glass can be a better alternative to polymers when it comes to UV degradation. Most of the commonly used glass types are highly resistant to UV radiation ...

3. Photodegradation - Wikipedia

   en.wikipedia.org/wiki/Photodegradation

   Effect of UV exposure on polypropylene rope A plastic bag photodegraded into approximately 2,000 pieces, 1 to 25 mm each, after three months' exposure outdoors. Photodegradation made a plastic straw brittle.

4. Weather testing of polymers - Wikipedia

   en.wikipedia.org/wiki/Weather_testing_of_polymers

   Polypropylene, a common material in our everyday environment, is a very significant example of this approach. Its chemical structure where many tertiary carbons are present (bound to three carbon atoms and only one hydrogen) makes it a particularly sensitive material to ageing.

5. Polypropylene - Wikipedia

   en.wikipedia.org/wiki/Polypropylene

   Polypropylene, highly colorfast, is widely used in manufacturing carpets, rugs and mats to be used at home. [47] Polypropylene is widely used in ropes, distinctive because they are light enough to float in water. [48] For equal mass and construction, polypropylene rope is similar in strength to polyester rope.

6. Ultraviolet - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet

   UV damaged polypropylene rope (left) and new rope (right) UV degradation is one form of polymer degradation that affects plastics exposed to sunlight. The problem appears as discoloration or fading, cracking, loss of strength or disintegration. The effects of attack increase with exposure time and sunlight intensity.

7. Moisture vapor transmission rate - Wikipedia

   en.wikipedia.org/wiki/Moisture_vapor...

   Moisture vapor transmission rate (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapor through a substance. It is a measure of the permeability for vapor barriers .