ADDITIVES | PVC FORMULATION
long-term weatherability in outdoor applications. Lubricants are added to improve the flow
Reagens tested two tin-based stabilisers and three calcium organic stabilisers for colour change after ageing and found similar performance Source: Reagens
these increasing requirements and offers Ca-Zn system stabilisers as an alternative to lead-stabilis- ers, such as ADK STAB RX-300 series for fittings, and ADK STAB RUP series for wire and cable, which are said to provide excellent heat stability, colour stability, and processability, as well as possessing other important mechanical properties. The company says recently it has also focused on the development of tin-replacement stabilisers, traditionally said to be difficult to replace due to their excellent stability performance, and claims its latest offering can provide similar levels of trans- parency, colour stability, heat stability, and heat ageing characteristics. Adeka has also succeeded in developing an improved weatherability stabiliser formulation for flexible PVC which can provide
properties of PVC, prevent sticking, and enhance surface finish. Several types are commonly used in PVC compound formulations, including Sasol’s Fischer-Tropsch Hard Waxes and oxidized Fischer- Tropsch (FT) waxes. In a presentation at AMI’s PVC conference in February 2024, Steve Torchia, Senior Manager Global Market Development and Product Innovation, Sasol, USA, said the company is developing a ‘lower carbon’ version FT wax manufactured using an improved gas-to-liquid (GTL) technology with a lower carbon footprint than the current GTL technology that was devel- oped in the early 2000s. He went on to say that the ultimate aim is to achieve a net zero carbon footprint by transitioning to alternative feedstocks, and Sasol is seeking development partners to further these ambitions.
Wax lubricants Sasol creates novel lubricant materials by function- alising wax. These chemistry changes alter the functionality and technical benefits for the PVC convertor, adding to their use in many other polymer compounds such as polyolefins, ABS, EPS, composites, and as dispersant and viscosity modifiers for colour masterbatch. In PVC potable water pipes, for example, Sasolwax B52 is a high efficiency lubricant requiring about half as much lubricant as PE wax or paraffin waxes. In recent times Sasol has introduced the Sasolwax B39 series of functionalised products, including formulated lubricant packages, which provide improved dispersion of CaCO3 filler and
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