The ratio of the WPC scrap:WPC freshfeed at 30:70 was found to
be the most appropriate mixing ratio based on the flexural
strength, flexural modulus, impact energy and reduction of mate-
rial cost by maximizing the use of WPC scrap. Re-processing of
the aforementioned formulation resulted in a drop in the flexural
strength and flexural modulus respectively, after the second pass
of re-extrusion. The impact energy of the WPC freshfeed, scrap
and their mixture were indifferent, and they remained relatively
unchanged even after seven re-processing passes. Determination
of the molecular weight of the PVC matrix revealed a gradual de-
crease after each pass of re-extrusion. However, a significant drop,
by 35% and 30% respectively, was detected in the both M n and the
M w upon re-processing for seven passes. Chain scission was be-
lieved to have occurred as a consequence of the shear stresses
introduced repeatedly on the PVC melt during each re-processing