Lithopone , ZNS content ≥28.0% , 1345-05-7

CAS NO.：1345-05-7

Empirical Formula: BaO5S2Zn2

Molecular Weight: 412.23

MDL number: MFCD00467106

EINECS: 215-715-5

PRODUCT Properties

• Density: 4.136~4.39
• InChI: InChI=1S/Ba.H2O4S.O.S.2Zn/c;1-5(2,3)4;;;;/h;(H2,1,2,3,4);;;;/q+2;;;;;/p-2
• InChIKey: YCEJLNKYYGDNTD-UHFFFAOYSA-L
• SMILES: S(=O)([O-])([O-])=O.O=[Zn].S=[Zn].[Ba+2]
• CAS DataBase Reference: 1345-05-7(CAS DataBase Reference)
• EPA Substance Registry System: C.I. Pigment White 5 (1345-05-7)

Description and Uses

Lithopone is a bright white pigment used in paints, inks, leather, paper, linoleum and flour. It was developed in the 1870s as a replacement or supplement for lead carbonate (white lead), in order to overcome its disadvantages of toxicity, poor weathering properties and darkening in atmospheres containing sulphur compounds. It is an insoluble mixture of barium sulphate and zinc sulphide, which precipitates when barium sulphate and zinc sulphate solutions are mixed. The precipitate is recovered by filtration and then calcined (roasted) at temperatures above 600° C (1,112° F). It is now replaced by titanium dioxide in most applications, but it is still widely used in many products such as water paints.

Lithopone is a mixed zinc sulfide-barium sulfate pigment available in two types; one containing 30 percent zinc sulfide and one containing 60 percent zinc sulfide. Coprecipitation is achieved by reacting an aqueous solution of zinc sulfate with barium sulfide. The barium sulfide solution is prepared by reducing barite ore (BaSO4) with carbon.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H302-H332
• Precautionary statements: P264-P270-P301+P312-P330-P501-P261-P271-P304+P340-P312