The B-test is used to determine time of thermosetting resins DIN 16916th The hot plate (polished stainless steel) contains 1 or 4 wells for receiving samples. A resin sample is placed in the trough, the stopwatch is started. The sample is stirred, at the end of the test, when the resin is tough, jerky is by pulling up the Rührnadel (or glass rod) to determine whether the resin still stringy. If there are no more threads but the resin tears off the B point is reached, the stopwatch is stopped, the time and temperature is recorded.