ADDITIVES | MINERAL FILLERS
Figure 3: Olfactometric test results showing the odour reduction performance of three different Rescofil absorbers from HPF The Mineral Engineers added at 5% to a PCR PP and tested to VDA 270 standard Source: HPF The Mineral Engineers
Right: HPF offers a range of thermally conductive fillers under the Silatherm brand
fillers to overcome this problem in recycled thermoplastics by adsorbing the majority of the odour-active substances. In a lab experiment, 5% of the filler was compounded into a PCR-PP, and the odour intensity tested using the VDA270 standard. The filler reduced the odour intensity to a level that was “not disturb- ing” (Figure 3). With the increasing focus on carbon footprint, there is a clear need for sound lifecycle analysis (LCA) data. The Industrial Minerals Association (IMA)-Europe has developed LCA data for certain minerals in Europe. In addition, HPF is developing product-specific footprints that take into account the company’s sustainability efforts. A further development from HPF is the compa- ny‘s Silatherm range of thermally conductive fillers,
which help meet the need for thermal manage- ment in electric vehicles, says Helge Mohr, Techni- cal Sales Manager Thermoplastics and Thermosets at HPF. The company recommends a filler content of at least 50 wt% to achieve a thermal conductivity of more than 2W/m*K. Silatherm fillers are electrically insulating. The company offers different grades based on different minerals, each of which is also available in different particle sizes and most with different surface coatings. These include Silatherm 1466 based on a natural aluminosilicate; Silatherm Advance 1438- 800 AST based on zinc oxide; Silatherm Lite 1468 low density surface-treated mineral fillers; Silath- erm Ultra 1483 based on boron nitride; Silatherm Next 1495-800 AST/4 based on aluminum oxide; and Silatherm Extra, which are formulated to meet specific customer requirements. Silatherm Plus is a surface-treated corundum. Using Silatherm Plus 1432, very high filler loadings can be achieved while maintaining excellent flow properties for applications such as ther- mally conductive casting resins, reports Mohr. The latest introduction
from CFI Carbon Products is Austin Black 325, a light- weight filler made from low volatile bituminous coal using what the company says is a
zero-emission process. The product E has a plate-like structure and a low specific
gravity of 1.30, allowing it to be used for light- weighting. The company says that although the material is a black powder (it is available as a powder or masterbatch) it is not a carbon black.
Functionalised fillers According to Omya Business Development
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