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PHOTOCHEM Sodium Thiosulphate per 1 kg (05540-1000PP)

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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.

 

CAS NO. 7772-98-7 (Anhydrous)
10102-17-7 (Pentahydrate)

SODIUM THIOSULFATE

EINECS NO. 231-867-5
FORMULA Na2O3S2
MOL WT. 158.10

H.S. CODE

 
TOXICITY  
SYNONYMS Thiosulfuric acid, disodium salt; Sodium Oxide Sulfide;
antichlor; HYPO; Hyporice; Sodium hyposulfite; sodium subsulfite;
DERIVATION  

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES (Anhydrous)

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  

AUTOIGNITION

 

NFPA RATINGS

Health: 2; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

 

FLASH POINT  
STABILITY Stable under ordinary conditions. Hygroscopic.

GENERAL DESCRIPTION & APPLICATIONS

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

ANHYDROUS TECH GRADE

APPEARANCE

white to off-white crystalline powder

Na2S2O3

97.5% min

HEAVY METALS

20ppm max

ANHYDROUS PHOTO GRADE

Na2S2O3

98.5% min

Na2SO3

0.5% max

NaOH

0.01% max

SULFIDE

2ppm max

Fe

10ppm max

HEAVY METALS

10ppm max

FREE ACID

20ppm max

INSOLUBLES MATTER

0.5% max

PENTAHYDRATE

Na2S2O3•H2O

99.5% min

Fe

10ppm max

HEAVY METALS

10ppm max

FREE ACID

0.01% max

NaOH

0.015% max

INSOLUBLES MATTER

0.2% max

30% SOLUTION

Na2S2O3

29.0 - 31.0%

pH

6.5 - 9

TRANSPORTATION

PACKING 25kgs, 50kgs, 1mt in Bag
HAZARD CLASS Not regulated
UN NO.  
OTHER INFORMATION
Hazard Symbols: n/a, Risk Phrases: n/a, Safety Phrases: 24/25 

 

 

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Today we are offering free freight in Australia on this product.Small items will ship via Australia post. All other products will ship via road freight or local couriers.This is a limited offer and subject to change at any time.

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