The automatic GELNORM®-Gel Timer TC for the measurement of gelation time under standardised conditions is easy to use and the results show exceptionally good reproduceability with all reaction resins such as:
• unsat. Polyester resins
• Epoxid resins
• Polyurethane resins
• Acrylic resins
• Silicone resins etc.
The instrument incorporates a switch-off mechanism that responds to pressure: the gelation time limit is reached when the measuring stamper meets a defined reaction force in the reaction resin. As a result of this automatic switch-off system, the size of resin sample employed is not limited. The disposable stamper of stainless steel wire carries out a defined reciprocating movement as soon as the instrument is set in operation and, when the change in viscosity is reached, a built in timer is stopped and the gelation time can be read off.
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.
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