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 2000 · 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 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.
Often bought together
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.
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1 kg — £46.50 per pack ex VAT · £55.80 inc. VAT
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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.
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 technical grade tri-Sodium phosphate anhydrous, 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.
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.