Rhodoline 991 Rhodia Defoamers / Anti-Foaming Agents ADHESIVE RHODOLINE 991 is a high-activity defoamer used in coatings and in polymer synthesis and stripping. Good phase-stability in drum Spreads rapidly, knocks down foam easily Effective at low and high temperatures Excellent persistence through entire batch cycles. An initial range of 0.05-0.10% RHODOLINE 991 based on the total system being defoamed is recommended for evaluation. High-activity defoamer. Offers good phase-stability in drum, rapid spread, efficiency at low and high temperatures, and very good persistence through entire batch cycles. Knocks down foam easily. Use level: 0.05-0.10%.