SaboLight WSPH is the latest innovation in HALS chemistry. This low molecular but oligomeric HALS is fully soluble in water and polyalcohols. In particular, its unlimited water solubility allows on-site introduction of SaboLight WSPH to the polymerisation process of PA 6, simply by dissolving it in the ring-opening water. This results in extremely fine homogenisation, lower dosage and very low VOC contribution with the final polyamide. In order to keep key parameters, such as CEG, AEG, RV, stable an adjustment of the chain-regulating system might be necessary.