User:Chem370dkS11/sandbox

General Properties

Molecular formula:	ZnS+BaSO_4

Molecular Weight:	330.80 g/mol

Physical Properties

Physical State:	        White powder

pH:	                Neutral

Specific gravity:	 5.21 g/ml

Melting point:	        2266 ̊C

Boiling point:	        4000 ̊C

Density:	        4.136-4.39 g/〖cm〗^3

I. Characteristics


 * a)White pigment


 * b)Easy case of acid decomposition of hydrogen sulfide gas, easily oxidized in air, Metamorphism after being damp.


 * c)Valuable pigment


 * i.Brilliant white and fine texture which is advantage over white lead and can be mixed with sulfur


 * ii.Cheaper grade of enamel paint – does not combine with rosin or semi-resin varnishes


 * iii.Does not oxidize progressively, oxidizes in one step, not several steps.


 * iv.Preliminary long time exposure show it is a valuable component of colored paint and exterior wooden surfaces


 * d)Free from poisonous properties


 * e)Unaffected by sulfur gases and mixed well with oils and other colors


 * f)If mixed with linseed oil or varnish, turns grey very fast in sunlight and white again in the dark (due to actinium)

'''II. History'''


 * a)1915-German or Dutch lithopone contains max amount


 * i.Different seals vary in percent and which manufacture


 * ii.Blue, white, yellow seal contain varying amounts of zinc sulfide


 * iii.2 grades of lithopone


 * 1.Gold seal and Bronze seal – 40-50% zinc sulfide and naturally more hiding power and strength. Also additional pure zinc sulfide.


 * b)1928 – Widely used in paint industry.


 * i.Made of 29% zinc sulfide, 71% barium sulfate


 * ii.Proper about of lithopone will form more or less plastic sticky mass


 * iii.Lithopone treated with water soluble soap so allow uniform adsorption on surface of pigment particles

'''III. Usage'''


 * a)Widely used for the white paint such as polyolefin, vinyl resins, ABS resin, polystyrene, polycarbonate, nylon, POM, plastic, paint and ink. For the Coloration of the rubber, cloth, leather, paper, colored enamel, etc