I was curious about the make-up so I contacted the manufacturer. The following was their response:
Hi John,
Although not intended for cooking purposes, we are aware that some people
use our wood pellets for cooking and smoking food. However please note we
have not conducted any tests regarding food/cooking safety.
Our pellets are a mixed blend of hardwoods (75%) and softwoods (25%).
Hardwoods are Maple, Birch and aspen. The softwoods are Spruce and Fir. No
additives or fillers are added and all lubricant used in the machinery are
food grade.
We trust this responds to your questions.
Thank you!
Note; The bag states "hardwood".