This document defines methods for reducing combined samples (or increments) to laboratory samples 
and laboratory samples to sub-samples and general analysis samples and is applicable to solid biofuels.
The methods defined in this document can be used for sample preparation, for example, when the 
samples are to be tested for calorific value, moisture content, ash content, bulk density, durability, 
particle size distribution, ash melting behaviour, chemical composition, and impurities.