Sources: Timber |
Conversion factors between cubic metres and green tonnes
The following factors have been used in Chapter 2 (Timber) to convert between cubic metres (m3) and green tonnes:
The following factors have been used in Chapter 3 (Trade) to convert between cubic metres (m3) and metric tonnes:
Product | m3 / tonne |
|---|---|
Fuelwood, including wood for charcoal | 1.38 |
Wood chips, sawdust, etc | 1.48 |
Industrial roundwood (wood in the rough) - softwood | 1.43 |
Industrial roundwood (wood in the rough) - hardwood | 1.25 |
Sawnwood - softwood | 1.82 |
Sawnwood - hardwood | 1.43 |
Veneer sheets | 1.33 |
Plywood, particleboard | 1.54 |
Hardboard | 1.053 |
MDF (medium density fibreboard) | 1.667 |
Insulating board - density 0.35-0.5 g/cm3 | 1.667 |
Insulating board - other | 4.00 |
The following factors have been used in Chapter 3 (Trade) where required to convert to wood raw material equivalent, which indicates the volume of wood (in m3 underbark) needed to produce one unit of a final product:
Product | Measurement unit | Factor to wrme underbark |
|---|---|---|
Fuelwood | tonnes | 1.20 |
Wood charcoal | tonnes | 6.00 |
Chips, sawdust, etc | tonnes | 1.20 |
Industrial roundwood (rough, treated) | m3 | 1.10 |
Industrial roundwood (in the rough) | m3 | 1.00 |
Sleepers | m3 | 1.58 |
Softwood sawnwood | m3 | 2.00 |
Hardwood sawnwood | tonnes | 2.50 |
Wastepaper | tonnes | 2.80 |
Mechanical pulp | tonnes | 2.50 |
Chemical dissolving pulp | tonnes | 2.50 |
Sulphate pulp, unbleached | tonnes | 6.00 |
Sulphate pulp, bleached | tonnes | 4.50 |
Sulphite pulp | tonnes | 5.00 |
Semi-chemical woodpulp | tonnes | 2.75 |
Veneer (< 6mm) | tonnes | 3.45 |
Other woodbased panels | tonnes | 2.50 |
Woodwool, woodflour | tonnes | 1.70 |
Packing cases, pallets | tonnes | 2.00 |
Other manufactured wood | tonnes | 2.50 |
Newsprint | tonnes | 2.80 |
Writing & printing paper, uncoated | tonnes | 3.50 |
Other paper & paperboard | tonnes | 2.50 |
Notes:
1. A revised set of figures was produced in FC Technical Paper 19, Revised Forecasts of the Supply and Demand for Wood in the UK (Forestry Commission, 1996), but these have not been used in this publication.
Conversion factors to oven dry tonnes
Woodfuel estimates have been converted to oven dry tonnes (odt) in Chapter 2 (Timber) using the following assumptions about moisture contents (if actual moisture contents were not reported):
- virgin roundwood and chips from whole log = 52%
- virgin sawmill chips and sawdust = 56%
- wood pellets = 10%
- recycled wood = 25%.