Tolutriazole Derivative Rz-O39 Product Code: D1410 Brand Name: Petrocor® Rz-O39 CAS No.: 80584-90-3 Main Content: equal to Irgamet 39 Application: Rz-O39 is used as corrosion inhibitor in industrial lubricant oil and approved by FDA/USA for use in blending lubricants with incidental food contact, It has the same good performance as Irgamet 39. Aquacor® Rz-O39 can help to strengthen corrosion inhibiting ability in your formula.