wood choice ??? high heat & humidity
I'm wondering what would be the best type of wood would for this application.
I have this big double-wall pyrex mug that I use for tea. It originally came with a wood lid --basically just a disc shape comprised of several glued-together pieces of bamboo. The lid is meant to keep the tea hot while it is brewing in the mug. (Tea aficionados call this method of brewing "grandpa style".)
Well, I used the mug a few times in that way, and the lid only lasted maybe three brews. The lid split in more than one place (I forget now whether it split the wood itself or along the glue seams.)
So my question is, if I were to turn a piece myself, what would be the best kind of wood to use? I would want it to be one piece --no gluing, about 4" in diameter, at least 1/2" thick, and resistant to high heat and humidity. Cost is not a primary concern. I was thinking elm might be a good choice, since I remember it is notoriously difficult to split with an axe. Finish coating or stain or none at all is also undecided.
(PS. I guess I could just turn a slab of plastic, but it obviously doesn't have the romance that wood does.)