BYK® -A 555

BYK®-A 555 by BYK is a silicone-free, polymer-based, air release additive for unsaturated polyester resins. In particular, it is also suitable for pultrusion applications with acrylic and vinyl ester resins. It displays the highest efficiency in deaerating virtually all UPR in all processing methods. The recommended level for ambient curing system is 0.1-0.5% additive (as supplied) based upon total formulation. It prevents air entrapment during the manufacture and application (pultrusion) of plastic systems. Its recommended level for pultrusion is 0.2 phr additive (as supplied) in combination with 0.3 phr BYK®-A 515 or BYK®-A 560. It is listed in EINECS, TSCA, DSL, AICS, PICCS, IECSC, ENCS, NZIoC and TCSI. It is in line with Directive 2011/65/EU (EU RoHS 2), as amended by the Delegated Directive (EU) 2015/863 (EU RoHS 3), 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®-A 555 is 60 months.