Here's an excerpt I found on how they are manufactured. Looks like they are heat treated. WDYT?
"While how wood pellet bedding is produced may differ by manufacturer, here’s how Talon ABM is made. ABM (Advanced Bedding Management) comes from raw pine material, only sourced from sawmills that cut more than 85-90% pine, with occasional portions of White Fir. There are no additives or chemicals involved. The product is manufactured from 100% wood. At no point during any part of the process is any other substance, other than clean water, blended in with the raw material. During manufacturing of the product, raw material has essentially been sterilized. Material is dried for up to thirty minutes at a range of 800°F down to 145°F at the conclusion of the drying process. The product is then subjected to approximately 20-30,000 PSI pressure, increasing temperature back up to approximately 200°F prior to cooling to room temperature. The product is packaged in clear bags so that the quality of the product can be seen."