B-Time determination on the B-Timing Plate provides information on the curing behavior of resins capable
namely the reaction time at a given temperature after
which resins (solid, liquid, or solvent-containing
resins of a known concentration)
change to the B-state.
This B-Timing Plate according to DIN 16 916 is mainly used for Phenolic resins.
Our standard B-Timing Plate has four depressions in the heating plate, accepting one sample each.
Plates without depressions are also available.
The temperature is precisely controlled with our temperature controller TC-3 (ref. 70.05).
The B-Timing Plate has to be protected against draughts with a cabinet open to one side.
Place resin sample of 500 mg in to a depression on the plate and start stop watch. Use a tapered glass
rod (Ø 3 mm, reduced to Ø 2 mm at one end) to impart short circular stirring motions to resin, directed
from edge to center of the depression. In case of extended B-times, stir for one minute, followed by 10
seconds of stirring, spaced at one-minute intervals.
Stir constantly when resin gets a tougher consistency toward the end of the test. Pull out glass rod briefly
to check if resin is still stringy. The B-point is reached when no strings result as the rod is pulled up and
the resin tears off in a rubber-like fashion. Stop the watch at this stage and read elapsed time.
Indicate elapsed time in minutes and seconds. Record testing temperature at which test has been done. Important
The heating plate is hard-chrome plated. Use only brass spatula or brass/copper brush for
Ref. 40.01 with 4 depressions
Ref. 40.02 without depressions
230 V / 50 Hz or 115 V / 60 Hz, ± 10 %
Ø 220 x 80 mm
Temperature Controller TC-3 Ref. 70.05