Deadrik/TFCraft — pull request #500 by ntwitch (2014-05-03 17:28:14+00:00)
Title: Add non-tool metal sheets to heat index so double sheets can be made

They are not usable for anything in TFC but may be used in addons.

I spoke with Bioxx and he considered this a bug, and that it should be possible to heat all sheets to weld into double sheets.