Made four test pucks today.
1. All clay.
2. One part clay one part ash.
3. One part clay one part sawdust.
4. two parts clay one part ash one part sawdust.
The clay was a clay slip about the same as pudding.
Now the hardest part waiting for them to dry.
I will keep this updated as I get results.
I'm in hopes to use one of the above mixes to cast my burn tunnel and heat riser.