The maximum achievable soluble ERL was found to be 0.2 g/L by A-pBuOzi-A triblock copolymer at 4 g/L ERL feed (LC ≈ 2 wt.% and LE ≈ 5%) (Figure ) while the in-house ERL aqueous solubility was found to be 0.007 g/L (Table ). Overall, the Ra, successfully identified the (comparatively) best solubilizer (i.e. A-pBuOzi-A) but the overall picture was not consistent with the compatibility estimation. The presently employed POx/POzi polymers and thin film hydration are clearly not well suited for ERL solubilisation.