I've been working on a project for another program and needed information about standards on pellets, so I looked at the PFI ratings. Of the five criteria Three are different based on their now four categories, density, ash as a % of weight, amount of allowed ash (.50% premium, 1.0, 2.0, 6.0% to utility) and moisture from 6% to 10%. Now I am sure the Utility grade is intended for commercial use and is not part of the 95% of pellets produced. So basically the differences for stove use are density from 40-46 per cubic foot with standard pellets allowed at 38 lbs/cf, no difference between premium and super premium and ash and moisture as above. There is no discussion of Btu's per pound, and a blanket standard for chlorine. Super premiums are supposed to contain no bark or other " contaminents". Here is their statement on the Website:
Grades of Pellets
Pellet mills produce two grades of fuel – Premium and Standard. The only difference between the two is ash content. Standard grade fuel is usually up to 3% ash content, while premium grade is less than 1 percent. This difference is a result of the pellet contents. Standard pellets are derived from materials that produce more residual ash, such as tree bark or agricultural residues. Premium pellets are usually produced from hardwood or softwood sawdust containing no tree bark. Premium pellets make up 95 percent of current pellet production and can be burned in all appliances. Standard pellets should only be burned in appliances designed to burn the higher ash content pellets.
Either they have not updated their text, or there is a lot of pressure on them to try and make a distinction. I know for many of us the extra cost for something that says Super is not balanced by the added costs. If you can save a dollar or two per bag and get a drop in performance of less than 10%. aren't we saving money to buy the better deal? It may mean adjusting your stove to burn differently, but according to the institute all pellets should burn in all stoves, a little simplistic, but the point is, we don't all have to pay for the premium when the regular will do fine.
Grades of Pellets
Pellet mills produce two grades of fuel – Premium and Standard. The only difference between the two is ash content. Standard grade fuel is usually up to 3% ash content, while premium grade is less than 1 percent. This difference is a result of the pellet contents. Standard pellets are derived from materials that produce more residual ash, such as tree bark or agricultural residues. Premium pellets are usually produced from hardwood or softwood sawdust containing no tree bark. Premium pellets make up 95 percent of current pellet production and can be burned in all appliances. Standard pellets should only be burned in appliances designed to burn the higher ash content pellets.
Either they have not updated their text, or there is a lot of pressure on them to try and make a distinction. I know for many of us the extra cost for something that says Super is not balanced by the added costs. If you can save a dollar or two per bag and get a drop in performance of less than 10%. aren't we saving money to buy the better deal? It may mean adjusting your stove to burn differently, but according to the institute all pellets should burn in all stoves, a little simplistic, but the point is, we don't all have to pay for the premium when the regular will do fine.