TiO2 Extension Calcined kaolin for TiO2
Calcined kaolin is an excellent TiO2 extender for thermoplastic sheets and films. Used in combination with TiO2, calcined kaolin maintains color and opacity in thermoplastics at a lower formulation cost.
TiO2 is used as an opacifier in many polymer applications, including thermoplastic sheets and films. Many consumer products comprise single or multilayer pigmented sheets with TiO2 added for color and opacity.
Although it is acknowledged as the most effective opacifier available, the cost of TiO2 has lead to the search for more cost-effective alternatives. Calcium carbonates have been used in combination with TiO2, but these are primarily as extenders and dispersion aids.
Imerys Hydrite range is a high whiteness kaolin when used in combination with TiO2, the color and opacity of thermoplastics can be maintained and cost savings achieved.
The Hydrite range is suitable for the partial replacement of TiO2 in LLDPE, HDPE and polystyrene (PS).
Mica can also partially replace ammonium polyphosphate (APP) systems in polyolefins, while improving mechanical properties without affecting overall fire resistance.
Loading levels of around 30% APP are commonly used to meet UL94 requirements such as V-0 ratings; however APP is expensive and diminishes physical properties such as tensile strength.
Replacing up to one third of APP flame retardant by Imerys mica not only improves fire resistance, char promotion and afterglow time, it boosts the mechanical properties of the material.
We recommend our Suzorite® range for this application.