For over 100 years, Kester has been a global leader in supplying higher performance interconnecting materials and related services to the electronic assembly market. Globally, Kester is known for their high quality product and advanced manufacturing technology.

Kester “331” is a high activity water-soluble core flux for soldering difficult metals. “331” is designed for optimal cleanability along with minimal smoke and odor. “331” is classified as ORH1 per J-STD-004.