new look at brittle definition

[bigbad4cyl]

this is pasted from somewere i found it--------------I do crude flex testing in two ways. I make small cubes or cylinders of epoxy and hit them with hammer or squeeze them in a vise. The really brittle ones turn to dust or break into a great many pieces. Less brittle ones will break into 2 or 3 or so pieces. I also apply the epoxy to a sheet of wax paper and let it cure. I then peel the epoxy off the wax paper and bend it. At some point it will snap and break. Note that epoxies many feel cured in a day or so, but take days (a week or longer) to fully cure so don't perform these tests right away. Give it a week or so before testing. Ditto for adhesion - you can probably pull off your epoxy/fiberglass repair the next day - don't! Give it time to bond....