My polymer clay items are very fragile?

Just to check the dumbest possibility, but you are baking these things at the right temperature and time? Including allowing more time for the thicker items? I don't work a lot in polymer but I played around to understand it and made a small pinch bowl with about 1/4" (6mm) thick sides and bottom and baked it by the rules - it is so tough that I can drop it several feet to the floor or other hard surface without visible damage.