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SODIUM THIOSULFATE
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PRODUCT IDENTIFICATION |
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| CAS NO. |
7772-98-7 (Anhydrous) 10102-17-7 (Pentahydrate) |
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| EINECS NO. | 231-867-5 | |
| FORMULA | Na2O3S2 | |
| MOL WT. | 158.10 | |
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H.S. CODE |
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| TOXICITY | ||
| SYNONYMS | Thiosulfuric acid, disodium salt; Sodium Oxide Sulfide; | |
| antichlor; HYPO; Hyporice; Sodium hyposulfite; sodium subsulfite; | ||
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CLASSIFICATION |
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PHYSICAL AND CHEMICAL PROPERTIES (Anhydrous) |
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| PHYSICAL STATE | White crystals or powder | |
| MELTING POINT | 43 C | |
| BOILING POINT | ||
| SPECIFIC GRAVITY | 1.667 | |
| SOLUBILITY IN WATER | Soluble (33%) | |
| pH | 6.5 - 8 | |
| VAPOR DENSITY | ||
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AUTOIGNITION |
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NFPA RATINGS |
Health: 2; Flammability: 0; Reactivity: 0 | |
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REFRACTIVE INDEX |
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| FLASH POINT | ||
| STABILITY | Stable under ordinary conditions. Hygroscopic. | |
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GENERAL DESCRIPTION & APPLICATIONS |
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| Sodium Thiosulfate is a white translucent crystals or powder that is common as the pentahydrate form; melting at 48 C; readily soluble in water and oil of turpentine; aqueous solution is slightly alkaline which decompose to sulfate and sulfide in the air. It is a moderate reducing agent. It is a source of thiosulfate ion (S2O3-2) (dissolves silver salts). Its major use is as a fixing agent in photography for developing film and the extracting silver from ore. It is used in chrome-tanning leather and in chemical manufacture as a source of sulfide ion. It is also used in paper, textile, water treatment industry and gas purification. | ||
| SALES SPECIFICATION | ||
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ANHYDROUS TECH GRADE |
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APPEARANCE |
white to off-white crystalline powder |
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| Na2S2O3 |
97.5% min |
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| HEAVY METALS |
20ppm max |
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ANHYDROUS PHOTO GRADE |
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| Na2S2O3 |
98.5% min |
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| Na2SO3 |
0.5% max |
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| NaOH |
0.01% max |
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SULFIDE |
2ppm max | |
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Fe |
10ppm max |
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| HEAVY METALS |
10ppm max |
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FREE ACID |
20ppm max |
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| INSOLUBLES MATTER |
0.5% max |
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PENTAHYDRATE |
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| Na2S2O3•H2O |
99.5% min |
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Fe |
10ppm max |
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| HEAVY METALS |
10ppm max |
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FREE ACID |
0.01% max |
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NaOH |
0.015% max |
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| INSOLUBLES MATTER |
0.2% max |
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30% SOLUTION |
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| Na2S2O3 |
29.0 - 31.0% |
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pH |
6.5 - 9 | |
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TRANSPORTATION |
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| PACKING | 25kgs, 50kgs, 1mt in Bag | |
| HAZARD CLASS | Not regulated | |
| UN NO. | ||
| OTHER INFORMATION | ||
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Hazard
Symbols: n/a, Risk Phrases: n/a, Safety Phrases: 24/25
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