Ageing time days to reach the same degradation level versus sample thickness mm

Weathering is difficult to quantify because of the variation of the parameters according to the local conditions  

The technical consequences of weathering are similar to heat ageing with more pronounced surface degradation and notably  

The Other additives in the compound can also influence weathering as we can see in Table 3.14, which displays the effect of colorants in combination with UV stabilization. Ageing behaviour depends on the nature of the colorant and the UV-filtering action of the filler. Black compound is by far the best choice. 

Exposure time of coloured PP divided by exposure time of pure PP 

The market appeal of plastics is important for numerous applications such as packaging, automotive,appliances. .. Colour,transparency,gloss and odour contribute to make aplastic part attractive, unappealing or repulsive. 

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Figure 3.42. Ageing time (days) to reach the same degradation level versus sample thickness (mm)...

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