The evaluation of long-term mechanical properties of wood-based panels by indoor exposure tests

Sekino, Noboru; Korai, Hideaki

doi:10.1007/s10086-018-1720-1

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 4 Retentions of mechanical properties for panels subjected to six different exposure conditions

From: The evaluation of long-term mechanical properties of wood-based panels by indoor exposure tests

Panels	Mild humidity		Semi-mild humidity	High humidity						Cyclic humidity						Roof sheathing	Ceiling of eave
Panels	6-y	10-y	5-y	1/4-y	1/2-y	1-y	2-y	3-y	5-y	1/2-y	1-y	3/2-y	2-y	3-y	5-y	9.5-y	9.5-y
Retention of bending strength, MOR (%)
OSB(A)	87	–	71 ^a	75	83	75	76	76	74	81	70	76	74	79	64	100	84
OSB(P)	91	–	95	91	100	86	98	83	81	90	77	97	94	96	92	98	97
PB(P)	96	–	96	83	100	100	87	72	67	90	85	98	86	88	75	100	100
PB(I)	100	–	100	100	99	99	96	92	85	100	100	99	94	100	95	100	100
MDF(M)	100	–	100	94	94	95	95	89	79	89	95	98	92	92	87	100	100
PW(P)	75	–	75	80	78	79	88	75	80	65	68	100	80	80	88	100	100
Retention of modulus of elasticity, MOE (%)
OSB(A)	83	–	69	79	83	64	75	62	62	76	67	77	69	63	56	96	77
OSB(P)	85	–	91	86	94	79	88	76	73	88	78	93	84	84	74	100	99
PB(P)	91	–	90	85	94	97	80	67	66	90	84	95	81	80	72	100	100
PB(I)	100	–	94	100	98	96	92	84	75	100	96	100	89	87	90	100	98
MDF(M)	100	–	99	95	94	93	96	85	75	92	92	96	91	85	84	100	100
PW(P)	85	–	85	87	80	97	91	80	89	93	85	100	88	78	85	100	86
Retention of internal bond strength, IB (%)
OSB(A)	61	71	64	68	66	65	70	67	69	62	56	63	55	75	33	86	76
OSB(P)	83	90	92	88	94	82	93	68	82	100	80	77	75	86	72	88	89
PB(P)	87	78	90	84	92	83	78	52	83	88	75	79	79	90	69	75	80
PB(I)	89	86	93	100	95	90	89	85	85	100	100	99	89	93	87	84	88
MDF(M)	100	100	100	100	100	77	100	100	97	100	100	100	95	100	100	88	100
PW(P)	93	98	100	79	94	100	100	76	100	100	90	100	84	89	74	77	100
Retention of internal lateral nail resistance, LNR (%)
OSB(A)	100	94	87	87	87	99	100	100	93	100	100	89	100	100	92	85	88
OSB(P)	88	98	100	99	100	100	100	100	100	100	100	91	79	100	100	100	100
PB(P)	94	88	100	100	100	99	96	100	100	100	100	98	100	100	99	76	99
PB(I)	100	100	100	100	100	100	100	100	99	100	100	100	100	100	100	100	100
MDF(M)	100	100	100	100	100	100	100	100	99	99	100	99	98	100	99	100	98
PW(P)	100	100	100	99	100	100	100	100	98	98	90	97	100	100	100	95	94
Retention of nail-head pull-through resistance, NHPT (%)
OSB(A)	99	97	100	75	77	100	100	89	100	90	81	95	94	96	93	80	81
OSB(P)	100	95	95	94	97	100	86	95	100	100	100	100	96	100	100	74	88
PB(P)	100	94	95	94	96	94	88	95	91	72	94	96	98	93	91	84	84
PB(I)	100	95	100	90	96	99	93	98	92	72	93	96	91	100	96	83	86
MDF(M)	98	100	99	96	95	99	100	95	99	77	99	99	99	100	99	76	90
PW(P)	100	100	100	93	100	100	100	88	100	96	95	100	100	100	100	94	97

OSB, PB, MDF, PW see Table 1
^aRetentions less than three quarters of the initial values are shown in italic bold, ‘-y’ shows ‘-year’

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