Common characteristics of all pellet fuels?
Although the chemical constituents and moisture content of different biomass materials vary, the Pellet Fuel Institute has identified the common characteristics and developed the fuel standards.
These voluntary industry standards will assume as much uniformity in the pellet fuel as is possible for naturally grown materials. PFI graded fuel must meet tests for the following areas:
Density-consistent [...]
Difference between standard and premium grade fuel?
All of the measurable characteristics defined by Pellet fuel Institute standards are basically the same except for ash content in both grades. Standard grade pellet fuel (up to 3% ash content) is typically derived from materials which result in more residual ash, such as sawdust containing tree bark (which contains more impurities) or agricultural residues [...]
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