In article ,
Derald wrote:
because I don't know what other compounds or chemicals might be used in
its manufacture.

Try the MSDS - trivial to get in the age of the internet. No need for
FUD.

http://www.usg.com/content/dam/USG_M.../united_states
/product_promotional_materials/finished_assets/sheetrock-gypsum-panels-ms
ds-en-54000001.pdf

Unless it's foil backed, it's:
85% gypsum,
10% cellulose
3% starch and
5% crystalline Silica (the deadly carcinogen also known as quartz sand
- and largely not in respirable form, as detailed in the MSDS. Also
found in most soils, shockingly enough.
There may (probably only in type X) be 1% glass fiber.

--
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