Iso nonyl phenoxy acetic acid Product Code: A1413 Brand Name: Petrocor® Rz-NPA CAS No.: 3115-49-9 Main Content: equal to Irgacor NPA Application: Rz-NPA is used as corrosion inhibitor in industrial lubricant oils and greases and fuels etc , It has the same good performance as Irgacor NPA. Rz-NPA has high activeness, so it can help to improve your formula with low cost.