Confirm the exact ash-content and quality thresholds for PFI Premium, Standard, and Utility pellet fuel grades beyond the Quality Mark producer registry.
domain: pelletheat.org · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Open the current PFI Standard Specification for Residential/Commercial Densified Fuel PDF hosted at pelletheat.org (most recently confirmed full-text revision dated 2022 as of this check)
Compare the three grades' ash-content ceilings (Premium ≤1.0% ash) and other parameters (fines, diameter, chloride, heavy metals referencing the ISO 17225-2 metals list)
Note PFI's grades map conceptually but not identically to the European/ISO 17225-2 A1/A2/B grading system — don't treat them as interchangeable labels
Verify the PDF's revision date before citing a specific numeric threshold, since PFI periodically reissues the spec
Known gotchas
This is PFI's own technical specification document, distinct from the already-covered PFI Quality Mark registered-producer lookup — use this route only for the spec's technical thresholds, not to verify a specific bag's certification status
PFI grade names (Premium/Standard/Utility) are North America-specific; don't apply them when discussing pellets sold under ENplus/DINplus grading
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