Also known as tungsten tungsten grains cosolvent is processed into fine particles of tungsten metal, particle size 20-40 mesh, high purity of 99.95% or more, so called tungsten cosolvent, mainly used for high-frequency infrared carbon and sulfur analyzer high cosolvents the combustion frequency, a good fluxing effect, the results are very stable. Tungsten is called additive, rather than co-solvent, not just because of the additive effect of flux, as well as fever, regulate acid-alkaline medium, stirring, catalysis, stable combustion, and interference multiple roles. Tungsten is difficult to melt the metal, melting point 3380 ℃, reason for using it as additive for the tungsten to oxidation. Tungsten at 650 ℃ in oxygen when it began to oxidize and release a lot of heat, with a high calorific value, reflecting the speed and other characteristics. Oxidation products are acidic oxides of tungsten trioxide, Volume loose, which is conducive to the formation of the release of co2 and so2, forming the cover layer not covered by the sample. Tungsten trioxide above 900 ℃ significant sublimation. Since tungsten trioxide escape, increasing the rate of diffusion of carbon and sulfur, carbon and sulfur in the sample sufficiently oxidized. Volatile tungsten trioxide after leaving the bath, at 700-800 ℃ is converted to the solid phase, covering the remaining Fe2o3 in the pipeline, the pipe to prevent the adsorption of sulfur. Low blank value tungsten, carbon can be used for the determination of sulfur. General tungsten - tin joint use as an additive, tin main role is to help melt, reducing the shortage of tungsten fluxing action impact. For non-magnetic materials should be supplemental iron.