I remember the days when flammable was the opposite to inflammable....apparently not anymore.
They mean the same thing ( although flammable doesn't really exist?) and the opposite to inflammable is nonflammable..according to the sources I have researched.....
So the materials that aren't flammable caught on fire?
From good old Wikipedia...
Historically, flammable, inflammable and combustible meant capable of burning. The word "inflammable" came through French from the Latin inflammāre = "to set fire to," where the Latin preposition "in-" means "in" as in "indoctrinate", rather than "not" as in "invisible" and "ineligible".
The word "inflammable" may be erroneously thought to mean "non-flammable". The erroneous usage of the word "inflammable" is a significant safety hazard. Therefore, since the 1950s, efforts to put forward the use of "flammable" in place of "inflammable" were accepted by linguists, and it is now the accepted standard in American English and British English. Antonyms of "flammable/inflammable" include: non-flammable, non-inflammable, incombustible, non-combustible, ininflammable, not flammable, and fireproof.