Fragility
Because Crashglas breaks 6 times easyer then real glas, carefull handling is mandatory. Do not exposure Crashglass to quick temperature changes and avoid near heat sources.
Usage with liquids
You can fill liquids into Crashglas mugs and glasses. However you need to remember that liquids also have a certain temperatur which should be the same as the enviroment (and the crashglas) itself and the object you filled has a higher weight what should result in a more carefull handling.
Even Crashglas is highly fragile you should remember there can be hard edges and splitters.
Breakawayglass is not a toy and not meant to be eaten!