Table 2.
Properties of composite boards made at different density

Mixing ratio*1	Denstiy(g/㎤)	RF		MOR		dMOE		sMOE
		(Hz)	p-value	(MPa)	p-value	(MPa)	p-value	(MPa)	p-value
50:20:20	0.5	102.2(12.34)	0.000	0.42(0.03)	0.000	94.5(22.73)	0.000	31.4(6.94)	0.000
	0.6	219.8(38.36)		2.27(1.00)		546.6(215.05)		136.1(43.65)
	0.7	268.3(37.12)		3.24(0.98)		888.4(266.75)		220.7(62.37)
*1: mixing ratio (sawdust : rice husk : charcoal)RF: resonant frequencyMOR: modulus of rupturedMOE: dynamic modulus of elasticitysMOE: static modulus of elasticity