Ammonium Thiosulfate CAS 7783-18-8

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  • Appearance: White powder
  • Purity: 99. 0%min
  • Stock: In stock
  • Sample: Available
  • Zhishang Chemical: Ammonium Thiosulfate Supplier & Manufacturer

Basic Info

What is Ammonium Thiosulfate?

Ammonium thiosulfate, chemical formula (NH4)2S2O3. Molecular weight 148.20. Colorless monoclinic crystals. The melting point is 150°C (decomposition), and the relative density is 1.679. Soluble in water, insoluble in ethanol, slightly soluble in acetone. Its aqueous solution has long-standing sulfur precipitation. Its concentrated aqueous solution above 50°C gradually decomposes into sulfur and sulfate. Ammonium thiocyanate and ammonium sulfite are formed in the presence of ammonia and hydrocyanic acid. Aqueous solution can dissolve silver halide. Its ability to dissolve silver chloride and silver bromide is greater than that of sodium thiosulfate, so it is also used for fast fixing. However, it has a dissolution effect on the metallic silver that constitutes the image.

Preparation method: It can be prepared by adding excess ammonium carbonate to calcium thiosulfate aqueous solution, or can be prepared by mixing ammonium bisulfide and ammonium bisulfite aqueous solution at an accurate molar ratio of 1:2, and reacting; it can also be obtained by freezing and crystallizing after double decomposition reaction of ammonium sulfite and ammonium polysulfide to remove sulfur.

Ammonium Thiosulfate Uses

  1. Clean “white” metal; In terms of photography; Lubricant used for metal cold working.
  2. Ammonium thiosulfate is used for semiconductor parts, synthesis of Organoboron chemistry, plasticizer, welding flux.
  3. Ammonium thiosulfate can be used to leach gold and silver because it forms a solid complex. It is widely used as a photographic fixer, and its effect is faster than that of Sodium thiosulfate fixer. It is used as fertilizer. As an additive for coal waste mixtures, it can inhibit the formation of hazardous dioxins and furans. Used as an analytical reagent in the laboratory.
  4. Ammonium thiosulfate acts as a complexing agent in cyanide free electroplating, and Thiosulfuric acid combines with silver ion to form Thiosulfuric acid silver complex ion. Improve the cathodic polarization effect, making the silver plating layer crystallize finely and have good coverage ability. The general dosage is 200-250 g/L.
  5. The photographic market is made use of as a photographic fixer. Compared with sodium salt, the solution movie of Silver halide is less complicated to liquify. It has the advantages of brief washing time and simple silver healing. Likewise used as the primary component of silver plating baths; Detergent for metal surfaces; Aluminum magnesium alloy spreading protective representative. Made use of as a fungicide as well as analytical reagent in medicine.
  6. Ammonium thiocyanate, also known as Ammonium cyanide, is used to synthesize tert butyl Thiocyanic acid, an intermediate of the insecticide thiazinone, and thiosemicarbazide, an intermediate of the insecticide zolimicarb, the fungicide lobazole, and the herbicide fluthiazolamide. In addition, it is also used as an auxiliary raw material and dye for manufacturing hydrogen peroxide, and as a polymerization catalyst for organic synthesis.

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Application of Ammonium Thiosulfate

Ammonium thiocyanate is commonly utilized as a photographic fixer, steel cleaner, electroplating service and also minimizing agent.

In farming, it is used to synthesize the intermediate tert-butyl isothiocyanate of the insecticide buprofezin, and the intermediate thiosemicarbazide of the pesticide pyraprocarb, the fungicide euconazole, and the herbicide flufenacet; additionally, it is likewise utilized as a complementary resources and also dye for the manufacturing of hydrogen peroxide, as well as a polymerization catalyst for natural synthesis.

In the photosensitive market; used as a photo fixer, it is much easier to liquify the silver halide emulsion than sodium salt, and has the advantages of brief washing time and also simple silver recovery; it is likewise made use of as the main element of the silver plating bathroom, and is used as a complexing representative in cyanide-free electroplating. Thiosulfate radicals combine with silver ions to create silver thiosulfate complicated ions. Enhance the cathodic polarization, make the crystallization of the silver plating layer penalty, and also the covering capability is excellent. The general dose is 200 ~ 250g/L.

It is also utilized in the synthesis of natural boron compounds, plasticizers, welding fluxes; steel surface cleaners; aluminum-magnesium alloy casting security representatives. It is utilized as a fungicide and analytical reagent in medication.

Production Method of Ammonium Thiosulfate


  1. MSDS – Ammonium Thiosulfate
  2. J. J. Barbera; A. Metzger; M. Wolf (2012). “Sulfites, Thiosulfates, and Dithionites”. Ullmann’s Encyclopedia of Industrial Chemistry.

Ammonium Thiosulfate Supplier and Manufacturer

As a ammonium thiosulfate supplier and manufacturer with a strict standard product quality system certificate, Zhishang Chemical has long been providing the best ammonium thiosulfate raw materials to customers all over the world.

Over the years, relying on professional team experience and customer-centric team concept to meet customer needs in a timely manner, our company enjoys a high reputation in the world. At present, our company has served more than 6,000 customers and has established long-term cooperative relations with customers from many countries.

If you have a demand for ammonium thiosulfate and related products, please contact our service staff Zhishang Chemical – White directly, and we will provide you with high-quality products at the best price.

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