Molekula
Ammonium thiosulfate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Ammonium thiosulfate is an inorganic compound primarily used as a photographic fixing agent, in metal processing for cyanide detoxification, and as a reducing agent in chemical synthesis. It is also widely applied as an agricultural fertilizer, in the leaching of gold and silver ores, and as a brightener in silver plating baths. It appears as a white to off-white crystalline solid, highly soluble in water. Catalogue details: CAS 7783-18-8, molecular formula (NH₄)₂S₂O₃, molecular weight 148.21 g/mol, storable at ambient conditions with no signal word classification. Molekula supplies ammonium thiosulfate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — £70.00 per pack ex VAT · £84.00 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Clear colourless liquid |
| Density | 1.320 - 1.335 |
| Colour (Pt-Co) | ≤15 |
| pH | 7.5 - 9.0 |
| Assay | 58.0 - 60.0% |
| Residue on Ignition | ≤0.1% |
| Insoluble Matter | ≤0.2% |
| Heavy Metals (Pb) | ≤0.01% |
| Alkalinity | 0.5 - 1.5% |
| Sulfide | ≤0.0002% |
| Iron (Fe) | ≤0.00025% |
| Sulfite | ≤1.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless, monoclinic crystals |
| Odour | Ammonia odor |
| Melting Point | 150 °c (decomp) |
| Boiling Point | 50 °C at 760 mmHg |
| Vapour Pressure | 0 mmHg |
Source: PubChem CID 6096946 (HSDB, CAMEO Chemicals)
Identification
| Property | Value |
|---|---|
| SKU | 29336208 |
| CAS Number | 7783-18-8 |
| IUPAC Name | diazanium;dioxido-oxo-sulfanylidene-lambda6-sulfane |
| Molecular Formula | (NH4)2S2O3 |
| Molecular Weight | 148.21 |
| Exact Mass | 147.9976 |
| SMILES | [NH4+].[NH4+].[O-]S(=O)(=S)[O-] |
| InChIKey | XYXNTHIYBIDHGM-UHFFFAOYSA-N |
| InChI | InChI=1S/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4) |
| PubChem CID | 6096946 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2832.30.50.00 |
| Tariff Code | 2832300000 |
Safety & GHS
Detailed safety information available in the SDS — see Documents below.
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Ammo hypo
- Ammonium hyposulfite
- Ammonium thiosulfate ((NH4)2S2O3)
- Ammonium thiosulphate
- diammonium sulfurothioate
- Diammonium thiosulfate
- diazanium;dioxido-oxo-sulfanylidene-lambda6-sulfane
- Thio-Sul
- Thiosulfuric acid (H2S2O3), diammonium salt
- Thiosulfuric acid, diammonium salt
Frequently asked questions
What is ammonium thiosulfate commonly used for?
Ammonium thiosulfate is primarily used in photography as a fixing agent, in water treatment for detoxifying chlorine, and in the textile industry for dyeing and bleaching processes.
What is the chemical formula and molecular weight of ammonium thiosulfate?
The chemical formula is **(NH₄)₂S₂O₃**, and the molecular weight is **148.21 g/mol**.
How should ammonium thiosulfate be stored?
Store in a cool, dry place at **ambient temperature**, away from moisture and incompatible substances.
What grades or purities of ammonium thiosulfate does Molekula supply?
Molekula supplies **technical-grade ammonium thiosulfate** suitable for industrial applications.
Can Molekula supply ammonium thiosulfate in bulk quantities?
Yes, we offer **bulk packaging options** (e.g., 25 kg drums, 1 MT big bags) for large-scale industrial needs.
What documentation comes with an order of ammonium thiosulfate?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a packing list.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.