Chemical laboratory

Trisodium Phosphate Dodecahydrate

High-Purity Cleaning Agent and pH Buffer

  • CAS 10101-89-0
  • Formula Na₃PO₄·12H₂O
  • Flash Pt N/A (Non-flammable) °C
  • Density 1.62 g/cm³
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Physical & Chemical Properties

Property Value Unit
Boiling point N/A (Decomposes) °C
Flash point N/A (Non-flammable) °C
Density 1.62 g/cm³ g/cm³
Solubility 23.8 g/100 mL (25 °C) -
Ph 11.5-12.5 (1% solution) -
Molecular weight 380.14 g/mol g/mol
Melting point 73.4°C °C
Vapor pressure N/A mmHg
Autoignition temp N/A -
Appearance Colorless to white crystals or crystalline powder -
Odor Odorless -
Vapor density N/A g/cm³

Overview

Trisodium Phosphate Dodecahydrate (Na₃PO₄·12H₂O) is a highly soluble inorganic salt that appears as colorless to white crystals or crystalline powder. With its strong alkaline properties (pH 11.5-12.5 in 1% solution) and excellent solubility in water, this versatile chemical compound serves as an essential ingredient in cleaning formulations, water treatment applications, and various industrial processes. The dodecahydrate form provides stability and consistent performance across a wide range of operating conditions.

Key Applications

  • Cleaning and Degreasing: Forms the backbone of heavy-duty cleaners and degreasers for industrial equipment, removing stubborn oils, grease, and organic residues from metal surfaces and machinery.
  • Water Treatment: Acts as an effective water softener by precipitating calcium and magnesium ions, preventing scale formation in boilers, cooling towers, and water distribution systems.
  • pH Adjustment: Provides reliable alkaline buffering in chemical processes, wastewater treatment, and laboratory applications where precise pH control is critical.
  • Detergent Manufacturing: Serves as a builder in commercial and industrial detergent formulations, enhancing cleaning performance and preventing soil redeposition.

Safety & Handling

Trisodium Phosphate Dodecahydrate is non-flammable with no flash point concerns, making it safe for storage and handling in most industrial environments. However, its strong alkaline nature requires proper personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing to prevent skin and eye contact. Ensure adequate ventilation when handling large quantities to minimize dust exposure. In case of contact, flush affected areas immediately with plenty of water and seek medical attention if irritation persists.

Storage & Shelf Life

Store in tightly sealed containers in a cool, dry location away from moisture to prevent caking and maintain product quality. The crystalline structure makes it sensitive to humidity, so proper sealing is essential. Keep away from acids and aluminum-based materials which may cause incompatible reactions. When stored properly in original packaging, the product maintains its effectiveness indefinitely. Use moisture-resistant containers and ensure good warehouse ventilation to prevent condensation.

Why Alliance Chemical

Alliance Chemical delivers Trisodium Phosphate Dodecahydrate with same-day shipping from our Taylor, Texas facility. We offer flexible shipping options including UPS for smaller quantities, LTL for medium orders, and FTL for bulk requirements. Every shipment includes comprehensive Safety Data Sheets (SDS) and Certificates of Analysis (COA) to ensure you receive consistent, high-quality product that meets your specifications. Our technical support team provides application guidance and troubleshooting assistance to optimize your processes.

Shipping & Availability

Parcel Shipping

UPS Ground supports pints, quarts, and most 1-gallon packages nationwide.

LTL Freight

5-gallon pails, drums, and totes move via LTL carriers such as ABF Freight, SEFL, Saia, and XPO.

Full Truckload

FTL available for palletized bulk orders. Competitive freight rates.

Local Pickup

Same-day pickup at our Taylor, TX warehouse for Texas customers.

SDS, COA, and TDS available for every product • Same-day shipping on orders before 1 PM CT

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Frequently Asked Questions

What is trisodium phosphate dodecahydrate (Na3PO4·12H2O) and what is it used for?
Trisodium phosphate dodecahydrate (Na3PO4·12H2O) is a white crystalline inorganic salt used as a strongly alkaline source of phosphate. It is commonly used in industrial cleaning, detergents, pH adjustment, metal surface treatment and as a laboratory reagent and phosphate source.
How should I store trisodium phosphate dodecahydrate and what is its typical shelf life?
Store in a cool, dry, well‑ventilated area in tightly closed, moisture‑resistant containers to prevent caking and moisture uptake. When kept sealed and dry it is chemically stable for long periods; manufacturers typically recommend product retesting after 1–3 years depending on packaging and grade.
What safety and handling precautions are required for trisodium phosphate dodecahydrate?
Handle with appropriate PPE including chemical‑resistant gloves, eye protection and protective clothing, and use local exhaust ventilation to minimize dust. Avoid skin and eye contact and inhalation; in case of contact, rinse with water and seek medical/industrial first‑aid per the safety data sheet.
How do different concentrations or grades of trisodium phosphate dodecahydrate affect its performance?
Solid grade and solution concentration determine alkalinity, corrosivity and buffering capacity: higher concentration yields higher pH and stronger cleaning/pH‑adjusting action. Grades (technical, reagent, ACS) differ in impurity levels and are selected based on required purity and end‑use compatibility.
What documentation is available for trisodium phosphate dodecahydrate (SDS, COA, TDS)?
Suppliers typically provide a Safety Data Sheet (SDS), Certificate of Analysis (COA) showing assay and impurity data, and a Technical Data Sheet (TDS) with handling, physical properties and application notes upon request or download. Request the most recent documents from your supplier before use.
How is trisodium phosphate dodecahydrate shipped and what packaging options are common?
It is usually shipped as a non‑regulated solid under many local rules but must comply with regional transport regulations; check local requirements for hazardous classification. Common packaging includes multi‑wall kraft bags, lined paper or plastic sacks (25 kg), fiber drums or bulk containers (totes/tonne bags).
What materials is trisodium phosphate dodecahydrate compatible or incompatible with?
It is compatible with stainless steel and many plastics but is strongly alkaline and can corrode or attack aluminum, zinc, tin, and reactive metals, and will react vigorously with strong acids. Avoid contact with incompatible metals and store away from acids and moisture to prevent unwanted reactions.
What are the key technical specifications for trisodium phosphate dodecahydrate?
Chemical formula: Na3PO4·12H2O; approximate molar mass: 380.13 g/mol; appearance: white crystalline solid; water of crystallization: 12 mol H2O per formula unit; typical assay/purity ranges are 95–99% depending on grade. Aqueous solutions are strongly alkaline and highly soluble in water.
Which industries and applications commonly use trisodium phosphate dodecahydrate?
Common industries include industrial and institutional cleaning, detergent and surfactant manufacture, water treatment and boiler chemical programs, metal surface preparation and finishing, ceramics and textile processing, and laboratory/analytical applications. It is used where a soluble phosphate and high pH are required.
How can I purchase trisodium phosphate dodecahydrate and what lead times or packaging choices are typical?
It is sold through chemical distributors and manufacturers in laboratory (100 g–1 kg), bagged (25 kg), drum, and bulk (tote/IBC) quantities and in grades from technical to reagent. Lead times depend on supplier and order size but common stock items can often ship within days; request COA, SDS and sample availability when ordering.

Documentation & Downloads

Safety Data Sheet
SDS / MSDS
Request COA
Certificate of Analysis
Technical Data Sheet (TDS)
Available for all products

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