BYK® -P 9904

BYK®-P 9904 by BYK is a processing additive/compatibilizer for hydrocarbon or HFC-blown polyurethane rigid foams and flexible foams based on polyol blends. It is a solution of a high molecular weight block copolymer with basic groups. When used with rigid foams, it supports faster emulsion formation between the blowing agent and the polyol during the foaming process. The smallest droplets are stabilized better and phase separation of the incompatible components is prevented. This results in a homogenous distribution of the raw materials and a more even distribution of the physical properties. The finer emulsion ultimately results in a finer cell structure. In flexible foams, it improves the compatibility between polyols, particularly in the case of polyether and polyester polyol blends. The recommended level is 0.2-2% additive (as supplied) based on the prepolymer or the polyol blend. It is listed in EINECS, TSCA, DSL, AICS, PICCS, IECSC, ENCS, NZIoC and ECSI. It is in line with EU Directive 2011/65/EC (RoHS 2), EU Directive 2002/96/EC (WEEE), EU Directive 94/62/EC (Packaging Waste) and CONEG Toxics in Packaging. It complies with REACH Regulation (EC) No 1907/2006. The shelf life of BYK®-P 9904 is 36 months.