Mechanical and Thermal Properties of R-High Density Polyethylene Composites Reinforced with Wheat Straw Particleboard Dust and Basalt Fiber

Table 4

Thermal expansion properties of HDPE and filled HDPE composites with combined fillers.

System	Filler content (wt%)	PB dust/BF ratio	LCTE (10^−6/°C)
			20→60°C	60→−30°C	−30→20°C
VHDPE/RHDPE	0	0	155.7 (4.5)	154.7 (7.3)	129.5 (1.8)
VHDPE/	50	2 : 1	118.1 (2.1)	107.8 (5.5)	97.2 (3.4)
RHDPE/		1 : 1	77.3 (2.6)	68.7 (1.1)	60.7
PB dust/BF		1 : 2	56.6 (1.0)	50.2 (0.8)	44.1 (2.6)

a, b, c, and d represent data statistics ranking in Duncan’s multiple range tests.