Douglas Harper's Etymology Dictionary
non-combustible
also noncombustible, 1804, from non- + combustible.
Usage examples of "non-combustible".
The first is non-combustible incense that is burned by smouldering it on charcoal blocks.
You can experiment with these and find those that seem right for your life or, if you make your own non-combustible incenses, you can combine a number of single fragrances to your own personal recipes.
The little flier carried her own oxygen and could be flown in any non-combustible atmosphere.
Cram them full of non-combustible data, chock them so damned full of 'facts' they feel stuffed, but absolutely 'brilliant' with information.