Trisodium phosphate CAS 7601-54-9

1. Product Identification

Property	Information
Product Name	Trisodium Phosphate, Sodium phosphate tribasic, Trisodium orthophosphate, TSP
CAS Number	7601-54-9
Molecular Formula	Na₃PO₄
Molecular Weight	163.94 g/mol
EINECS Number	231-509-8
MDL Number	MFCD00003510
HS Code	2835293000

---

2. Physicochemical Properties

The properties can vary slightly depending on the form (anhydrous vs. hydrated) and the source.

Property	Value
Appearance	White powder or white to almost white crystalline solid
Odor	Odorless
Melting Point	1,583 °C (decomposes); other sources report 1,340 °C or 75 °C (decomposes)
Density	2.536 g/cm³ (at 17.5 °C)
pH	11.8 (1% solution at 25 °C)
Solubility in Water	121 g/L at 20 °C; other sources report 88 g/L at 20 °C or 12 g/100 g at 20 °C
Bulk Density	2.536 g/cm³
Vapor Pressure	0 Pa at 20 °C

---

3. Specifications & Purity

Typical specifications for commercial grades (e.g., food or technical grade):

Parameter	Specification
Assay (Purity)	≥ 96.0%; ≥ 97.0%; ≥ 98.0%
Water Insoluble	≤ 0.2%
Loss on Ignition (800 °C)	≤ 2.0%
Arsenic (As)	≤ 0.0005%; ≤ 3 mg/kg
Lead (Pb)	≤ 0.001%; ≤ 10 mg/kg
Fluoride (F)	≤ 0.005%; ≤ 50 mg/kg
Heavy Metals (as Pb)	≤ 0.001%
Sulfates (SO₄)	≤ 0.01%
Iron (Fe)	≤ 0.001%

---

4. Applications & Uses

Trisodium phosphate is a highly alkaline, water-soluble salt with a wide range of applications:

• Cleaning and Detergents: A key ingredient in soaps, detergents, and industrial cleaners for its ability to saponify grease and oils.

• Water Treatment: Used as a water softener and boiler scale remover.

• Food Additive: Employed as a food additive.

• Industrial Applications: Used in photographic developers, the paper industry, and as a flux for hard soldering copper plumbing.

• pH Adjustment: Acts as an effective builder and dispersing agent for pH adjustment.

• Antibacterial Agent: Has demonstrated antibacterial activity against E. coli and S. aureus.

---

5. Safety & Handling (GHS)

Based on safety data sheets, Trisodium phosphate is classified with the following hazards:

• Signal Word: Warning

• Hazard Statements (H-phrases):

  • H315: Causes skin irritation.

  • H319: Causes serious eye irritation.

  • H335: May cause respiratory irritation.

• Precautionary Statements (P-phrases):

  • P261: Avoid breathing dust.

  • P264: Wash skin thoroughly after handling.

  • P280: Wear protective gloves/eye protection/face protection.

  • P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

• Storage: Store in a cool, dry, well-ventilated place, keep container tightly closed, and avoid moisture.

• Incompatibilities: Strong acids and magnesium metal.

• Hazardous Decomposition: Oxides of phosphorus and sodium at high temperatures.

---

6. Transport Information

Property	Information
UN Number	Not typically classified as hazardous material for transport
DOT/IATA	Not hazardous material

---

Disclaimer: This information is compiled from various public sources and is for reference only. It is not a substitute for a full Safety Data Sheet (SDS) or Certificate of Analysis (COA). Always consult the official SDS and COA for a specific product before handling or use.