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Cadmium Sulfide

Alternate Names: Greenockite, CdS

Oxide Analysis Formula
CdO 88.85% 1.00
LOI 11.14%n/a
Oxide Weight 128.41
Formula Weight 144.51


It is practically insoluble in water but soluble in ammonium hydroxide and acids. The material occurs as the mineral greenockite, which is recovered as a byproduct of the refining of zinc ores. It is oxidized to the sulfate and then reprecipitated as chemically pure cadmium sulfide by hydrogen sulfide.

Cadmium sulfide is a important source of both cadmium and sulfur. They complement each other in producing yellow and red colors in enamels and glasses. Often, selenium is used in the compounds.

Since this material does not contain CdO in the raw state, the only way it can source CdO to a glass is to pick up oxygen externally. The percentage CdO shown here compensates so that the conversion factor will be correct in calculations.

Related Information


Hazards Cadmium Toxicity
Typecodes Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Cadmium sulfide at Wikipedia
Oxides CdO - Cadmium Oxide


Frit Softening Point 900C
Density (Specific Gravity) 3.8-4.8
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