Kester Ultra Low Dross Series Solder Bar Overview:

Note: Kester recently changed part #'s. 44-6337-0030 is equivalent to 04-6337-0030

Manufactured by a special process that controls the inclusions of oxides and metallic and non-metallic impurities, Kester Ultrapure® is the industry standard bar solder for use in high tech electronic applications where lower surface tension and hole filling ability are essential. The purity of Ultrapure meets the requirements of IPC/J-STD-006C and will conform to these requirements when purchased directly or through stocking distributors.

Process Information

Many solder impurities have been known to contribute to dross formation. Kester Ultra Low Dross integrates low dross technology with Kester’s extruded bar manufacturing process. To minimize oxidation and alloy segregation, Kester pours and quick chills ingots of solder alloy. The ingot is inserted into an airtight hydraulic press which then extrudes bars in a highly efficient and automated manner.

Storage, Handling and Shelf Life

Storage must be in a dry, non-corrosive environment between 10 to 40 °C (50 to 104 °F). The surface may lose its shine and appear a dull shade of grey. This is a surface phenomenon and is not detrimental to product functionality. Solder bar has a shelf life determined by the alloy used in the bar. For alloys containing more than 70% lead, the shelf life is 2 years from the date of manufacture. Other alloys have a shelf life of 3 years from the date of manufacture.

Kester Ultrapure® bar solder is now available and being sold by the individual bar. Each bar equals 1 2/3 lbs.