Changing of specification
As part of a changeover to a more precise and reproducible measurement of the color and brightness values of our products, we have changed the corresponding data in our material specifications.
For the product groups Sillitin, Sillikolloid, Puriss and Aktisil, we have replaced the previously specified brightness value Y with the less ambiguous L * and b * values.
In the area of the calcined products Silfit and Aktifit, the optimization of the sample preparation in combination with the introduction of a new colorimeter leads to a significantly improved measurement accuracy, which makes it necessary to adjust the color values L *, a * and b *.
We should emphasize that the manufacture and properties of all products have not been changed and that the measured values for the color space of our products have only been adjusted to the new measurement system.
The updated values are already provided as supplementary information to your certificates of analysis since January 2020. You will find the new specifications for our products under the following link: Material Specifications