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

 

 

 

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