Specification

Woodchip will be generated from timber which has been felled, stacked and allowed to dry for at lease 12 months prior to chipping. The aim is to produce woodchip with a moisture content of 30% or less.

 


The following specifications apply:

Chip
Designation
Maximum % Particulate Size
<4% <20% 60-100% <20%
Maximum Extremes
Area cm2 Length cm
     
G30
G50
G100
G120
G150
<1mm 1-3mm 3-16mm >16mm
<1mm 1-6mm 6-32mm >32mm
1mm 1-11mm 11-63mm >63mm
<1mm 1-100mm 63-100mm >100mm
<1mm 1-100mm 100-130mm >130mm
3 8.5
5 12
10 25
12 30
15 40
   

Moisture Content Classification

Chip
Designation
Moisture content in % (wet basis
MC Definition
     
W20
<20
Air Dried
W30
20-30
Undercover Stored
W35
30-35
Limited Undercover Stored
W40
35-40
Wet
W50
40-50
Green

 


Both woodchips and wood-pellets must be free from the following contaminants:

General contamination such as slate, stones, metal,rubber, plastic & other unidentified foreign bodies.
woodchip-square
Heavy metal compounds as a result of treatment (eg Copperchrome Arsenate (CCA) identified by green colour)
Halogenated organic compounds, e.g. lindane (identified by yellow colour)
Creosote (identified by dark brown stain and smell)
Painted wood, MDF, hardboard, fibreboard.


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