Molekula
tri-Sodium phosphate anhydrous
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Tri-sodium phosphate anhydrous is a water-soluble inorganic compound used as a pH regulator, detergent builder, and scale inhibitor in industrial and laboratory applications. It appears as a white, crystalline powder. CAS: 7601-54-9, Molecular formula: Na3PO4, Molecular weight: 163.94 g/mol, Storage: Ambient, Signal word: Warning.
Molekula supplies tri-Sodium phosphate anhydrous at ≥97% purity in 1 kg packs, from £55.80 inc. VAT. It is in stock for same-day dispatch. Every batch ships with a certificate of analysis, and a safety data sheet is available. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
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 — £46.50 per pack ex VAT · £55.80 inc. VAT
Need a different quantity or pack?
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 | White powder |
| Heavy metals | ≤0.001% |
| pH | 11.5 - 12.5 |
| Assay | ≥97% |
| Water insoluble matter | ≤0.2% |
| Fluorine (F) | ≤0.005% |
| Arsenic (As) | ≤0.0003% |
| Chlorine (Cl) | ≤0.005% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless crystals |
| Melting Point | 1583 °C |
| Density | 2.5 (relative, water = 1) |
| Solubility (other solvents) | Freely soluble in water. Insoluble in ethanol |
Source: PubChem CID 24243 (HSDB, ICSC, EU Food Improvement Agents)
Identification
| Property | Value |
|---|---|
| SKU | 23442991 |
| CAS Number | 7601-54-9 |
| IUPAC Name | trisodium;phosphate |
| EC Number | 231-509-8 |
| Molecular Formula | Na3PO4 |
| Molecular Weight | 163.94 |
| Exact Mass | 163.9227 |
| SMILES | [O-]P(=O)([O-])[O-].[Na+].[Na+].[Na+] |
| InChIKey | RYFMWSXOAZQYPI-UHFFFAOYSA-K |
| InChI | InChI=1S/3Na.H3O4P/c;;;1-5(2,3)4/h;;;(H3,1,2,3,4)/q3*+1;/p-3 |
| PubChem CID | 24243 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28352930 |
| Tariff Code | 2835293000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+341 IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Dri-Tri
- Nutrifos STP
- Oakite
- Phosphoric acid, trisodium salt
- Sodium phosphate, anhydrous
- Tribasic sodium phosphate
- Trinatriumphosphat
- Trisodium orthophosphate
- TRISODIUM PHOSPHATE
- Tromete
Frequently asked questions
What is tri-Sodium phosphate anhydrous used for?
It is commonly used as a water softener, pH regulator, and in cleaning formulations due to its strong alkalinity and chelating properties.
What is the chemical formula and molecular weight of tri-Sodium phosphate anhydrous?
The formula is Na3PO4 with a molecular weight of 163.94 g/mol.
How should tri-Sodium phosphate anhydrous be stored?
It should be stored at ambient temperature in a dry, well-ventilated area away from moisture and incompatible materials.
What grade of tri-Sodium phosphate anhydrous does Molekula supply?
Molekula supplies tri-Sodium phosphate anhydrous with an assay of ≥97%, suitable for industrial and laboratory applications.
Can Molekula supply tri-Sodium phosphate anhydrous in bulk?
Yes, Molekula can supply tri-Sodium phosphate anhydrous in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of tri-Sodium phosphate anhydrous?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) upon request.
Where can I buy tri-Sodium phosphate anhydrous?
Directly from Molekula, which lists tri-Sodium phosphate anhydrous in 1 kg packs from £55.80 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
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.