Treatment Specifications

H1 Low decay hazard This confers protection against all insects commonly found in New Zealand. Its major use is as house framing, interior linings, and trim.	H3 Moderate decay hazard This is for timber exposed to the weather but not in contact with the ground. Typical uses are fence palings, rails, decking and weather-boards
H4 High decay hazard This is for most ground contact situations. Barn poles, fence posts, stays and strainers, crib walling (treated in its final form) and other landscaping uses are typical examples.	H5 Severe decay hazard This is intended for ground contact in critical end uses such as foundation piles and poles, in-ground parts of decks and patios and horticultural supports.
H6 Marine hazard This is for marine use -wharf piles and fenders, marina and jetty components regularly immersed in sea water.

Wood density per region

Comparison of Strength Properties
Species	Specific	Modules: Rupture (kg/cm2)	Modules: Elasticity (kg/cm2)	Compression Strength (kg/cm2)	Shear Strength (kg/cm2)
NZ Pine	0.50	1000	117000	440	115
Englemann Spruce	0.35	650	91000	31	85
Siberian Larch	0.48	950	128000	500	100
Douglas Fir Coastal	0.48	870	137000	520	80
Lauan		800	114000	410	86
			source: New Zealand Forest Research Institute

 

Comparison of Strength Properties
?
Species	Turning	Shaping	Sanding	Planing	Gluing	Cutting	Stability
?				Molding
NZ Pine	3.9	4.4	4.2	4.8	4.1	3.8	4.1
Nyatoh	3.4	4.3	4.3	4.6	3.8	2.6	3.7
Rubberwood	4.2	4.2	4.5	3.7	5.3	3.1	4
Ramin	4.3	4.7	4.6	4.6	3.7	2.9	2.5
Merkus Pine			4.4	4.5	4.4	4	4
Jelutong	4.4	4.8	4.4	4.8	2.5	4	3.8
White Seraya	3.7	3.8	3.3	4.4	3.1	2.2	3.9
	1=very poor, 2=poor, 3=fair, 4=good, 5=excellent
	source: New Zealand Forest Research Institute