Specification

Woodchip will be generated from timber which has been felled, stacked and allowed to dry for at least 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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