So that the device can match the maximum of standards, we have developed new accessories and we add additional features to our software incorporating the specific working methods and the corresponding data processing methods.

The first two standards that we have chosen to integrate into the Rheotech^TR are the ASTM D7029-04 and theDIN 16945 standards. They refer both to the measurement of the gel time by monitoring the temperature curve.

ASTM D7029-04 Test Method for Determination of Reactivity of Unsaturated Polyesters and Vinyl Esters at 180 ° F [82.2 ° C] recommends the use of a test tube in borosilicate glass with a diameter of 19 mm iand a thermocouple J with a thicness of 3 mm, the latter being guided by a part facilitating its centering in the test tube. The tests are carried out in a bath at 82.2 ° C. Data from this trial are:

- the gel time : the time for the resin temperature to go from 65,5°C to 78,8°C ;

- the cure time : the time between 65,5°C and the maximum temperature ;

- the interval time : the time between 78,8°C and the maximum temperature ;

- the peak exotherm i.e. the maximum temperature.

The method described in Section 6.2 of DIN 16 945 Testing of resins, hardeners and accelerators, and catalyzed resins is based on a similar principle. This method is recommended for epoxy resins, polyester resins, polyurethane resins and acrylic resins. The thermocouple used in this case is a thermocouple J of 1 mm diameter. The data from this test are the following:

- the gel time : the time for the resin temperature to go from a first temperature T₀ to a second temperature T₁ ;

- lthe cure time : the time between T₀ and the maximum temperature ;

- the peak exotherm i.e. the maximum temperature.

^{(T₀ and T₁ depend on the studied resin. These temperatures are indicated in the standard).}

If you want to use the Rheotech^TR with other standards for measuring the gel time, please contact us specifying the number of the standard and the treatments you would like to use at the following address: info@mat-ing.com.