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2.4. Thiourea(Thiocarbamide;Thiocarbonic diamide)series

Property: The white or pale yellow sheen of a flake, or columnar or needle-like crystals and bitterness. Melting point 180-182°C, the relative density of 1.405, Soluble in water and ethanol, practically insoluble in diethyl ether. easy deliquescence In the air, at 150°C into ammonium thiocyanate, In vacuum distillation 150-160 °Cand 180 °C decomposition. With the reduction, enable free state iodine reduced iodine ions.

Application:the synthetic materials used sulfathiazole, methionine and pig unit of raw materials such drugs. For raw materials of dyes and pigments, resins and plastic powder pressure.Also can be used as a rubber vulcanization accelerator, metal mineral flotation agent system phthalic anhydride and fumaric acid catalyst, and for anti-corrosion agent of metal. In photographic materials, can be used as a developer and a toner, can also be used for the electroplating industry. Thiourea is also used in diazo light sensitive paper, synthetic resin coating, anion exchange resin, to promote germination agent, microbicides and other areas. Thiourea is used as fertilizer as well.

Packing:to be packed in 25kg net weight pp woven bag with pe bag inside or by contract.

Quality index

items

HG/T 3266-2002Index

Sample from    onebatch

Thiourea content ,%               ≥

98.5

99.2

Reduction after heating ,%       ≤

0.50

0.20

Matter insoluble in water,%      ≤

0.05

0.038

Thiocyanate content(calculated as CNS,% ≤

0.05

0.028

Melting point,°C           ≥

170

171.0

Ash content,%                   ≤

0.15

0.13