Fig. 1 shows the flexural strength and the flexural modulus of
the WPC freshfeed, WPC scrap and their mixtures. The flexural
strength and flexural modulus of the WPC profiles extruded from
20 to 30 wt.% of scrap mixed with 80 and 70 wt.% of WPC freshfeed
were very close to that of the WPC extruded from freshfeed only. A
significant drop, by 23% in the flexural strength and by 29% in the
flexural modulus, to the level close to those of the pure scrap was
apparent when 40 wt.% of scrap was mixed. Further increments of
the WPC scrap to 60 and 80 wt.% in the mixture evidently reduced
the flexural strength and the flexural modulus. Hence, the mix ratio
of the WPC scrap:freshfeed at 30:70 was most appropriate ratio
in terms of flexural properties and reduction of cost of WPC freshfeed
for recycling WPC