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Potassium dichromate is available in small orange colored, free-flowing crystals. It is non-hygroscopic, and unlike sodium dichromate dissolves sparingly in water to give a saturated solution of
14% only at 250C.
Application
Its special uses are in the manufacture of safety matches, pyrotechnics and explosives.
Other uses are in printing inks, synthetic perfumery, glues and adhesives, process engraving and lithography, photography and film processing and as an analytical reagent in Laboratories.
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The Indian Standard Specification for Technical Grade-IS 250: 1961 is as
follows:
Potassium Dichromate
| As
K2Cr2O7 |
99.00%
Min |

|
| Sulphates as
SO4 |
0.30% Max. |
| Chlorides as CI |
0.50% Max. |
| Calcium as
CaSO4 |
0.10% Max. |
| Free moisture |
0.50%
Max |
| Matter insoluble in water |
0.30%
Max |
Packing
50 kg. Polythene lined jute bags.
Storage & Shelf Life
It is non-caking and if stored in a cool, dry place away from heat, shelf life is indefinite.
Being a powerful oxidizing agent, it should not be stored along with inflammable organic
Chemicals.
Physiological Aspect
Handle all solutions of dichromate with gloves on. If it comes in contact with any cuts or
Bruises on the skin, immediate washing of the affected part with a 5% solution of sodium bisulphate and then with water is recommended, to prevent the formation of chrome sores.
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