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BYK USA (Wallingford, Conn., U.S.) presents BYK-P 9920, a processing additive specifically designed for advanced composite fiber-reinforced applications. It offers a number of benefits for composite systems, including significantly improving fiber wetting, which reduces and eliminates dry spots in the finished part, dramatically improving scrap rate and reducing rework. The increased fiber wetting also decreases mold fill times, allowing for faster part production and part turnover.

BYK-P 9920 is also an effective defoamer and air release additive, especially in epoxy systems. This air release behavior is beneficial in fiber-reinforced composites and floor coatings to eliminate porosity and air voids.

As BYK-P 9920 is high solids and emission-free, it is particularly well-suited for closed-mold advanced composite applications such as epoxy and vinyl ester systems with either glass or carbon fiber reinforcement. The epoxy-functional groups contained in the additive enable embedding into the resin matrix when the material is cured.

According to the company, BYK-P 9920 mixes very easily into liquid resins and is easy to incorporate into any production line at any processing stage. Its typical additive loading is low with regards to the overall resin system. Testing in systems using BYK-P 9920 show minimal or no adverse effect on mechanical properties or water absorption. Furthermore, it is storage stable within the resin system.