GELNORM® - MED is a measuring instrument for the hard setting sequence of two component systems, which either have a high initial viscosity or in which the viscosity rises to very high values during the hard setting process. The instrument is also suitable for systems that have a filler type starting viscosity: the viscosity of such systems cannot be measured with conventional rotational viscometers.

Description of Equipment

GELNORM®-Med consists of a compact control unit with stand, in which the measuring equipment is incorporated. At the heart of this measuring unit is a force sensor, on the end of which the test body is attached. This is dipped into the reactive resin based substance at a defined speed, e.g. 0.01mm/sec. In this process, the increasing viscosity is displayed as a force, measured in Newton, against time (Fig. 1).
Provision is also made to measure, simultaneously with the force, the change in temperature in the resin specimen, and to record this.

The measuring data is displayed on a PC using software included in the scope of supply, and this can be further evaluated using MS-Excel®. The parameters needed for the measurement (speed, force range, countdown, data name, etc.) are preset directly on the PC before measurement commences.

When measurement has been completed the lower part of the test body is left in the reaction resin and is thrown away with the resin specimen. The part is not cleaned.

Measuring Procedure

The reaction resin mixture is prepared in a beaker or other receptacle suitable for the measurement. The start button on the front of the GELNORM®-Med is then pressed.
Initially, a countdown sequence (e.g. 60 seconds, –
freely selectable in steps from 1 second to max. 300 seconds) is run off to allow time for the substance to be mixed and placed ready underneath the measuring unit. The test body is then lowered into the resin specimen under the control of the LIFT/SINK push button.
At the end of the countdown period, the test body automatically enters the reaction resin mixture at the preset speed. Simultaneously, the data (viscosity and possibly temperature) is transmitted online to a computer via an RS 232-interface, and is displayed. The measuring data is stored and is then available in an MS-Excel®-file, allowing further evaluation.

Technical Data