Effect of Moisture in the Composite

TABLE 16.10 Effect of wood flour content on fading of wood flour (40 mesh pine) filled HOPE 

Weathering was conducted under a 2-h cycle (108 min UV + 12 min UV/ water spray) [9]. 

Fading of WPC boards in a weathering box can be significantly decreased if to turn the water spray off. For example, for a wood flonr (50% w/w, 40 mesh)-filled HDPE (the initial lighmess of 48 units), exposure in a weathering box (UV + water) has led to the increase in AL (in percent) by 63, 80, and 87%, but when water was off, UV treatment only led to the increase in AL by only 9,22, and 28% [9], 

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