Table 4. Effect of particle size composition on physical and mechanical properties of CBP

Physical and mechanical properties	Particle size composition					NWPCA standard
Physical and mechanical properties	100% coarse	100% powder	50% coarse: 50% powder	70% coarse: 30% powder	30% coarse: 70% powder	NWPCA standard
Density (g/cm³)	0.60 (0.00)^a	0.59 (0.00)^a	0.61 (0.05)^ab	0.60 (0.00)^ab	0.59 (0.00)^b	-
Moisture content (%)	5.18 (0.40)^a	5.07 (0.46)^a	6.49 (0.07)^b	6.12 (0.63)^b	6.47 (0.44)^b	-
Dimensional stability (length; %)	1.88 (0.24)^a	4.63 (0.28)^b	1.78 (0.08)^a	2.26 (0.57)^ac	2.69 (0.34)^c	≤ 2
Dimensional stability (width; %)	2.19 (0.53)^a	3.74 (0.29)^b	2.09 (0.44)^a	2.36 (0.08)^a	3.34 (0.24)^b	≤ 2
Dimensional stability (height; %)	10.74 (0.59)^a	12.70 (0.12)^b	10.84 (0.41)^b	11.58 (1.23)^b	11.76 (1.35)^b	≤ 6
Water absorption (%)	87.70 (11.69)^a	94.59 (5.91)^ab	80.80 (5.98)^a	83.76 (2.25)^a	90.32 (3.84)^ab	≤ 25
Compressive strength (MPa)	14.67 (1.63)^a	3.80 (0.53)^b	11.18 (0.63)^c	9.35 (1.36)^d	6.69 (1.43)^e	≥ 9.65
Screw holding strength (N)	371.50 (65.68)^a	209.44 (29.42)^b	336.56 (71.07)^a	310.62 (67.50)^a	229.68 (22.66)^b	≥ 200

The results of the statistical tests denoted by the same letter indicate the absence of noticeable differences.
CBP: chip block pallets, NWPCA: National Wooden Pallet and Container Association.