additives feature | Carbon black


high purity, easily dispersible conductive carbon blacks, which meet property requirements but avoid the cost and dispersion issues of extra-conductive blacks, adds Van Bellingen. Orion is also targeting electrically conductive


applications with its new XPB 538, which has a high specific surface area comparable to that of the


company’s extra-conductive black Printex XE 2-B. This delivers electrical conductivity at low carbon black


Orion has launched new conductive grades aimed at applications such as cable jacketing


greater shear during compounding or downstream processing. The type and level of carbon black required to achieve conductivity is a key variable. A common strategy is to use extra-conductive


carbon blacks to reduce carbon black loadings and help to maintain virgin resin properties. However, research at Timcal using HDPE has shown that a high-quality, easily dispersible conductive carbon black (Timcal’s Ensaco 250G) retains the same physical and flow properties as an extra-conductive carbon black (Ensaco 350G) at equivalent conductivity, even though the extra-conductive carbon black is used at a lower level (for the full report, see Compounding World, November 2012 – http://bit.ly/timcal). In addition to carbon black loading, dispersibility and


low impurity levels are crucial for maintaining proper- ties. This knowledge gives formulators an option for designing the most cost-effective product, says Van Bellingen. Extra-conductive carbon blacks would be desirable for applications that also require further weight savings, easy welding, or very low sloughing. Outside of these applications, there is increasing use of


loadings. XPB 538 has high purity levels, which are needed for applications such as toys or platinum cross-linked silicones. Orion has also introduced another conductive black, XPB 545, with high jetness and gloss for antistatic- coating formulations and conductive compounds. XPB 545 has low levels of heavy metals and achieves a balanced performance of conductivity, dispersibility, and cleanliness that allows it to offer effective perfor- mance at lower concentrations, says the company. Orion’s new Printex HV offers the cleanliness,


dispersibility, and conductivity required for the semi- conductive layer in high-voltage (HV) cables. Low ionic, particulate, or sulphur impurities prolong cable service life.


Click on the links for more information: ❙ www.aemerge.com ❙ www.ampacet.com ❙ www.asiacarbonindustries.com ❙ www.birlacarbon.com ❙ www.cabot-corp.com ❙ www.orioncarbons.com ❙ www.timcal.com


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