Salts & Minerals
REACH
Trisodium phosphate dodecahydrate
CAS Number
10101-89-0
EC Number
600-151-8
Abbreviation
TSP
What is Trisodium phosphate dodecahydrate?
Trisodium phosphate dodecahydrate (CAS 10101-89-0), commonly known as TSP, is the hydrated crystalline form of trisodium phosphate.
Where is Trisodium phosphate dodecahydrate used?
- Industrial cleaning and surface preparation: cuts through grease, oils, and mineral deposits on metal and concrete
- Painted surfaces: applied prior to coating or refinishing for proper adhesion
- Water treatment: adjusts pH and sequesters calcium and magnesium ions, preventing scale formation
- Textile and paper processing: controls bath pH and chelates interfering metal ions during bleaching and dyeing
- Flame retardant formulations and building materials: contributes phosphate-based fire resistance to coatings and adhesives
- It functions as a heavy-duty cleaner, pH buffer, and sequestrant.
Commercial specifications
- Bulk bags or multi-wall sacks
- Food-grade material packaged for handling and contamination control
Other Names (Synonyms)
Sodium phosphate tribasic dodecahydrate|Sodium phosphate dodecahydrate|Phosphoric acid, trisodium salt, dodecahydrate|Phosphoric acid, trisodium salt, dodeahydrate|B70850QPHR|FRESH AQUA|Phosphoric acid, sodium salt, hydrate (1:3:12)|Trisodium orthophosphate dodecahydrate|TSP
What are the physical properties of Trisodium phosphate dodecahydrate?
Melting Point 65 °C
Density 1.62 g/cm³ (liquid)
Appearance white crystals
Color White
Form Solid
Water Solubility 258 g/L (20 ºC)
pH 12 (10g/l, H2O, 20℃)
Log P -2.148 (est)
How is Trisodium phosphate dodecahydrate classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS07· Irritant
Hazard Statements
H314 Causes severe skin burns and eye damage
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
Which trade and regulatory codes apply to Trisodium phosphate dodecahydrate?
HS Code 28352300
UN Number 3262
ADR Class 8
Packing Group III
Storage Class 8A - Combustible corrosive hazardous materials
WGK (Germany) 1