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Table 4 Analysis of variance of BN and DB woods glulam’s characteristics with varied glue mixtures

From: Bonding strength of benuang and duabanga glulams using their barks as phenol formaldehyde-filler

ParameterGlue MixturesBNDB
MeanP-valueRemarksMeanP-valueRemarks
MC (%)A11.83 (0.18)a0.00**11.00 (0.14)a0.00**
B11.72 (0.19)a10.12 (0.20)b
C11.63 (0.27)a10.21 (0.27)b
D11.22 (0.29)b10.17 (0.28)b
ρ (g/cm3)A0.40 (0.02)0.51NS0.48 (0.02)0.63NS
B0.41 (0.04)0.47 (0.04)
C0.43 (0.02)0.50 (0.02)
D0.41 (0.03)0.49 (0.03)
Boiling water delamination (%)A0.00 (0.00)NS0.00 (0.00)NS
B0.00 (0.00)0.00 (0.00)
C0.00 (0.00)0.00 (0.00)
D0.00 (0.00)0.00 (0.00)
Cold water delamination (%)A0.00 (0.00)NS0.00 (0.00)NS
B0.00 (0.00)0.00 (0.00)
C0.00 (0.00)0.00 (0.00)
D0.00 (0.00)0.00 (0.00)
Bonding strength (Kgf/cm2)A52.36 (3.98)0.18NS69.30 (12.64)0.44NS
B54.19 (5.32)70.04 (8.77)
C50.40 (8.85)75.89 (2.12)
D44.83 (7.42)77.18 (10.03)
Wood failure (%)A94.00 (2.24)0.03NS32.00 (21.39)0.00**
B98.00 (2.74)77.00 (13.96)
C100.00(0.00)76.00 (18.17)
D97.00 (4.47)87.00 (12.04)
  1. Numbers in the parentheses are standard deviation values
  2. a,b significantly different between treatments (glue formulae)
  3. ** Significantly different (P-value ≤ 0.01)
  4. NS not significantly different