It has become the largest manufacturer and supplier of Fire Assay Flux in the world. Klen International became part of the VWR group based in USA in late 2012. VWR is a major supplier to the ...

ARL iSpark Plus Fire Assay Analyzer. Image Credit ... Fluxing and Fusion: The sample is pulverized, combined with lead oxide and flux, then heated to approximately 1100 °C in a crucible. The lead ...