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Ditta 5
Indirizzo: via dei platani 4 liguria
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Ditta 1
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Northern rata
Northern rata (Metrosideros robusta)

Family: Myrtaceae

Common names: Northern rata, Rata

Distributed in: New Zealand (Oceania and S.E. Asia)

Common uses: Agricultural implements, Boat building (general), Bridge construction, Hockey sticks, Posts, Railroad ties, Tool handles, Vehicle parts, Wharf construction

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isRed, Yellowand the sapwoodWhite, Yellow.The grain isStraight, the textureMediumand the lusterMedium

Natural durability: Susceptible to insect attack, Very durable

Drying Defects: Checking, Distortion

Ease of Drying: Moderately Difficult to Difficult

Response to hand tools: Fairly Difficult to Difficult to Work

Turning: Fairly Easy to Very Easy

Polishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 753 kg/m3
Bending Strength 673 1048 kg/cm2
Crushing Strength 485 699 kg/cm2
Hardness 972 kg
Impact Strength cm
Shearing Strength 166 kg/cm2
Stiffness 115 132 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 6 %
Weight 737 592 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9577 14919 psi
Density 47 lbs/ft3
Hardness 2143 lbs
Maximum Crushing Strength 6899 9945 psi
Shearing Strength 2365 psi
Stiffness 1637 1887 1000 psi
Weight 46 37 lbs/ft3
Radial Shrinkage 6 %
Tangential Shrinkage 10 %

Max. crushing strength = high
Shrinkage, Tangential = large
Shrinkage, Radial = large
Shearing strength (parallel to grain) = high
Modulus of Elasticity (stiffness) = low
Hardness (side grain) = medium
Bending strength (MOR) = medium
Shearing strength (parallel to grain) = medium
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = medium
Modulus of Elasticity (stiffness) = high
Hardness (side grain) = very hard
Hardness (side grain) = hard
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 38-45 lbs/cu. ft.
Bending strength (MOR) = low
Bending strength (MOR) = high

Bier, H.,1983,The strength properties of small clear specimens of New Zealand-grown,timber,New Zealand Forest Service Forest Research Institute, FRI Bulletin No.41Brown, W.H.,1978,Timbers of the World, No. 8 Australasia,TRADA, Red Booklet SeriesEntrican, A.R., Et al,1951,The Physical and Mechanical properties of the principal indegenous woods,of New Zealand,New Zealand Forest Service, Wellington NZ
*Come interpretare i dati (manleva su eventuali imprecisioni)