Unflammable

Refrigerators used for flammables should be unflammable material storage units or explosion-free.

Many of the silane-based penetrants are alcohol- or solvent-based and flammable. The nature of AAS used in this study is unflammable and unvolatile, which allowed for construction safety;

The main advantage of PEG over organic solvents is that it is more easily handled. It is unflammable, not poisonous, uncharged, and relatively unexpensive.