Table 1. Composition and alkali treatment of WPC samples

Sample code	Wood flour composition		Alkali pretreatment
	% Ulin	% Sengon
P1	75	25	Yes (Ulin)
P2	50	50	Yes (Ulin)
P3	25	75	Yes (Ulin)
P4	50	50	No

WPC: wood-plastic composites.